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Futaba 7CAP Manual

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Futaba 7CAPFutaba 7CA24GRX 7 CH 2.4GHz Air Radio System TX/RX Only
The Futaba 7C is one of the most affordable yet most functional 2.4GHz computer radio systems on the market today. The 7C is a system that offers much of the 9C's set-up versatility matched to 4-channel ease of use, what more could you want? Like all other Futaba computer systems, it offers Dial n' Key simplicity for programming, and the 2.4GHz FASST system for an unparalleled RF link. Other 7C features include R617FS FASST 7-Ch Receiver, 600mAh 4.8V NiCd Receiver Battery, NT8S600B 600mA... Read more

Brand: Futaba
Part Numbers: 7CA24GRX, FUTK7004, K7004
UPC: 4513886204814
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Technical updates and additional programming examples available at:\faq\7c-faq.html
Entire Contents Copyright 2003


TABLE OF CONTENTS INTRODUCTION.3 Additional Technical Help, Support and Service.3 Application, Export and Modification.4 Meaning of Special Markings.5 Safety Precautions (do not operate without reading).5 Introduction to the 7C.7 Contents and Technical Specifications.9 Accessories.10 Transmitter Controls & Switch Identification/Assignments.11 Charging the Ni-Cd Batteries.14 Stick Adjustments.15 Radio Installation.16 Range Checking & Aircraft Frequencies.17 Transmitter Displays and Buttons.18 Warning and Error Displays.19 AIRPLANE FUNCTIONS.20 Map of Functions.21 Quick Guide to Setting up a 4-channel Airplane.22 ACRO BASIC MENU FUNCTIONS.25 MODEL Submenu: MODEL SEL. , COPY and NAME.25 Parameter(PARA.) Submenu: RESET,TYPE,MODUL, CH5 & CH7.28 Servo REVERSE.31 End Point (E. POINT).32 Idle Management: THR-CUT.33 Dual Rates and Exponential ( D/R,EXP ).34 TIMER.37 TRAINER.38 TRIM.39 SUB-TRIM.40 Fail Safe (F/S).41 ACRO ADVANCE MENU FUNCTIONS.42 Wing types.42 Flaperon (FLAPRN).43 Flap Trim (FL-TRIM).44 ELEVON (see tail types).45 Tail types.45 ELEVON.45 V-TAIL.46 SNAP ROLL.47 Mixes: definitions and types.48 ELE-FLP.49 FLP-ELE.50 AIL-RUD.51 Air Brake (A.BRAKE).52 Prog. Mixes (P-MIX1-3).53 Other Equipment.56 HELICOPTER FUNCTIONS.57 Table of contents and reference info for helicopters.57 Getting Started with a Basic Helicopter.58 HELI-SPECIFIC BASIC MENU FUNCTIONS.61 MODEL TYPE (PARA. submenu).61 SWASH AFR (swashplate surface direction and travel correction) (not in H1).63 Setting up the Normal Flight Condition.65 TH-CUT (specialized settings for helicopter specific models).66 HELI-SPECIFIC ADVANCE MENU FUNCTIONS.67 Throttle Hold (TH-HOLD).67 TH-CRV, PI -CRV and Revolution. Mix(REVO).68 Idle-ups.69 Trims/offset.70 Hovering setups.71 Gyros.72 Glossary.74 Note that in the text of this manual, beginning at this point, any time we are using a features specialized name or abbreviation, as seen on the screen of the 7C, that name, feature, or abbreviation will be exactly as seen on the radio's screen, including capitalization, and shown in a DIFFERENT TYPE STYLE for clarity. Any time we mention a specific control on the radio itself, such as moving SWITCH A, KNOB VR , or the THROTTLE STICK, those words will be displayed as they are here.
INTRODUCTION Thank you for purchasing a Futaba 7C series digital proportional R/C system. This system is extremely versatile and may be used by beginners and pros alike. In order for you to make the best use of your system and to fly safely, please read this manual carefully. If you have any difficulties while using your system, please consult the manual, our online Frequently Asked Questions (on the web pages referenced below), your hobby dealer, or the Futaba Service Center.
Owner's Manual and Additional Technical Help This manual has been carefully written to be as helpful to you, the new owner, as possible. There are many pages of setup procedures and examples. However, it need not be your sole resource of setup guidelines for your 7C. For example, pages 22-24 include setup instructions for a basic 4-channel airplane. The Frequently Asked Questions web page referenced below includes this type of step-by-step setup instructions for a variety of other model types, including multi-engine, complex gear installation, 7-servo aerobatic models, 140 degree CCPM, etc. Due to unforeseen changes in production procedures, the information contained in this manual is subject to change without notice. Support and Service: It is recommended to have your Futaba equipment serviced annually during your hobby's "off season" to ensure safe operation. IN NORTH AMERICA Please feel free to contact the Futaba Service Center for assistance in operation, use and programming. Please be sure to regularly visit the 7C Frequently Asked Questions web site at\faq\faq-7c.html. This page includes extensive programming, use, set up and safety information on the 7C radio system and is updated regularly. Any technical updates and US manual corrections will be available on this web page. If you do not find the answers to your questions there, please see the end of our F.A.Q. area for information on contacting us via email for the most rapid and convenient response. Dont have Internet access? Internet access is available at no charge at most public libraries, schools, and other public resources. We find internet support to be a fabulous reference for many modelers as items can be printed and saved for future reference, and can be accessed at any hour of the day, night, weekend or holiday. If you do not wish to access the internet for information, however, don' t worry. Our support teams are available Monday through Friday 8-5 Central time to assist you.

FOR SERVICE ONLY: Hobby Services (U.S. only) 3002N, Apollo Drive, Suite 1 Champaign, IL 61822 U.S.A. (217)398-0007
FOR SUPPORT : (PROGRAMMING AND USER QUESTIONS) Please start here for answers to most questions:\faq\faq-7c.html FACSIMILE: 217-398-7721 PHONE: 217-398-8970 option 4
OUTSIDE NORTH AMERICA Please contact your Futaba importer in your region of the world to assist you with any questions, problems or service needs. Please recognize that all information in this manual, and all support availability, is based upon the systems sold in North America only. Products purchased elsewhere may vary. Always contact your region's support center for assistance.
Application, Export, and Modification 1. This product may be used for model airplane or surface (boat, car, robot) use, if on the correct frequency. It is not intended for use in any application other than the control of models for hobby and recreational purposes. The product is subject to regulations of the Ministry of Radio/Telecommunications and is restricted under Japanese law to such purposes. 2. Exportation precautions: (a) When this product is exported from the country of manufacture, its use is to be approved by the laws governing the country of destination which govern devices that emit radio frequencies. If this product is then re-exported to other countries, it may be subject to restrictions on such export. Prior approval of the appropriate government authorities may be required. If you have purchased this product from an exporter outside your country, and not the authorized Futaba distributor in your country, please contact the seller immediately to determine if such export regulations have been met. (b) Use of this product with other than models may be restricted by Export and Trade Control Regulations, and an application for export approval must be submitted. In the US, use of 72MHz (aircraft only), 75MHz (ground models only) and 27MHz (both) frequency bands are strictly regulated by the FCC. This equipment must not be utilized to operate equipment other than radio controlled models. Similarly, other frequencies (except 50MHz, for HAM operators) must not be used to operate models. 3. Modification, adjustment, and replacement of parts: Futaba is not responsible for unauthorized modification, adjustment, and replacement of parts on this product. Any such changes may void the warranty.

SERVOS Please see technical specifications page for specifics on the servos included with your system. The included receiver is compatible with all J-plug Futaba servos, including retract, winch, and digital servos.
CONTENTS AND TECHNICAL SPECIFICATIONS (Specifications and ratings are subject to change without notice.) Your 7CAP or 7CHP (packaged with a 7-channel PCM receiver or a 7-channel FM receiver) system includes the following components:
R127DF Receiver or R138DP Receiver Servos, S3004, S3151, S3003 or S3001, with mounting hardware and servo arm assortment Switch harness Aileron extension cord 110V wall charger (North America) Frequency Flag
Transmitter T7CAP/T7CHP Operating system: 2-stick, 7 channels Transmitting frequency: 50 or 72 MHz bands Modulation: FM/PPM or PCM, switchable Power supply: 9.6V NT8S600B Ni-Cd battery Current drain: 250 mA
Servo S3151 ( Standard, digital ) Control system: Pulse width control, 1.52 ms neutral Power requirement: 4.8V (from receiver) Output torque: 43.0 oz-in(3.1 kg-cm) at 4.8V Operating speed: 0.21 sec/60 at 4.8V Size: 1.59 x 0.79 x 1.42 (40.5 x 20 x 36.1 mm) Weight: 1.48 oz (42 g)
Servo S3001 (Standard, ball-bearing) Control system: Pulse width control, 1.52 ms neutral Power requirement: 4.8 - 6.0V (from receiver) Output torque: 41.7 oz-in (3.0 kg-cm) Operating speed: 0.22 sec/60 Size: 1.59 x 0.78 x 1.41 (40.4 x 19.8 x 36 mm) Weight: 1.59 oz (45.1g)
Receiver R138DP (PCM Dual conversion) Receiving frequency: 50 or 72 MHz bands Intermediate freq.: 10.7 MHz & 455 kHz Power requirement: 4.8 - 6.0V Ni-Cd battery Current drain: 16 mA Size: 2.56 x 1.42 x 0.85 (65 x 36 x 21.5 mm) Weight: 1.42 oz (40.3 g) Channels: 8
Servo S3003/S3004 (Standard/ball-bearing) Control system: Pulse width control, 1.52 ms neutral Power requirement: 4.8 - 6.0V (from receiver) Output torque: 44.4 oz-in (3.2 kg-cm) at 4.8V Operating speed: 0.23 sec/60 at 4.8V Size: 1.59 x 0.78 x 1.41 (40.4 x 19.8 x 36 mm) Weight: 1.31 oz (37.2 g)
Receiver R127DF (FM Dual conversion) Receiving frequency: 50 or 72 MHz bands Intermediate freq.: 10.7MHz & 455 kHz Power requirement: 4.8 - 6.0V Ni-Cd battery Current drain: 10 mA Size: 2.53 x 1.41 x 0.83 (64.3 x 35.8 x 21.0 mm) Weight: 1.43 oz (40.5 g) Channels: 7
The following additional accessories are available from your dealer. Refer to a Futaba catalog for more information:
NT8S Transmitter battery pack - the (600mAh) transmitter Ni-Cd battery pack may be easily exchanged with a fresh one to provide enough capacity for extended flying sessions.
Trainer cord - the optional training cord may be used to help a beginning pilot learn to fly easily by placing the instructor on
a separate transmitter. Note that the 7C transmitter may be connected to another 7C system, as well as to many other models of Futaba transmitters. The 7C transmitter uses the newer rectangular type cord plug. Both new-to-new and new-to-round plug style trainer cords are available.

Stick tip A

Locking piece B
Stick lever tension adjustment

Aileron Elevator

Mode 2 transmitter with rear cover removed.
You may adjust the tension of your sticks to provide the feel that you prefer for flying. To adjust your springs, youll have to remove the rear case of the transmitter. First, remove the battery cover on the rear of the transmitter. Next, unplug the battery wire and remove the battery from the transmitter. Next, using a screwdriver, remove the four screws that hold the transmitters rear cover in position, and put them in a safe place. Gently ease off the transmitters rear cover. Now you'll see the view shown in the figure above. Using a small Phillips screwdriver, rotate the adjusting screw for each stick for the desired spring tension. The tension increases when the adjusting screw is turned clockwise. When you are satisfied with the spring tensions, reattach the transmitter's rear cover. Check that the upper printed circuit board is on its locating pins. When the cover is properly in place, reinstall and tighten the four screws. Reinstall the battery cover. Adjusting Display Contrast To adjust the display contrast, from the home menu press and hold the End button. Turn the dial while still holding End button: clockwise to brighten counterclockwise to darken the display Let go off the dial and the button. Changing Modes: Hold down the MODE and End buttons while turning on the transmitter. The screen reads "STK-MD". Change this to the correct mode. Note that this will NOT change the throttle and elevator rachets, etc. Those are mechanical changes that must be done by a service center.
RADIO INSTALLATION While you are installing the battery, receiver, switch harness and servos into your model's fuselage, please pay attention to the following guidelines:

Wood screw

Rubber grommet Brass eyelet Servo mount or rail
Use the supplied rubber grommets when you mount each servo. Be sure not to over-tighten the screws. If any portion of the servo case directly contacts the fuselage or the servo rails, the rubber grommets will not dampen the vibration, which can cause mechanical wear and servo failure.
Servo Throw Once you have installed the servos, operate each one over its full travel and check that the pushrod and output arms do not bind or collide with each other, even at extreme trim settings. Check to see that each control linkage does not require undue force to move (if you hear a servo buzzing when there is no transmitter control motion, most likely there is too much friction in the control or pushrod). Even though the servo will tolerate loads, any unnecessary load applied to the servo arm will drain the battery pack quickly. Switch Harness Installation When you are ready to install the switch harness, remove the switch cover and use it as a template to cut screw holes and a rectangular hole slightly larger than the full stroke of the switch. Choose a switch location on the opposite side of the fuselage from the engine exhaust pipe, and pick a location where it cant be inadvertently turned on or off during handling or storage. Install the switch so it moves without restriction and snaps from ON to OFF and vice versa. Receiver Antenna It is normal for the receiver antenna to be longer than the fuselage. DO NOT cut or fold it back on itself --- cutting or folding changes the electrical length of the antenna and may reduce range. Secure the antenna to the top of the vertical fin, and let the excess wire length trail behind. You may run the antenna inside of a non-metallic housing within the fuselage, but range may suffer if the antenna is located near metal or carbon fiber pushrods or cables. Be sure to perform a range check before flying. Receiver Notes When you insert servo, switch or battery connectors into the receiver, note that each plastic housing has an alignment tab. Be sure the alignment tab is oriented properly before inserting the connector. To remove a connector from the receiver, pull on the connector housing rather than the wires. If your aileron servo (or others) are too far away to plug into the receiver, use an aileron extension cord to extend the length of the servo lead. Additional Futaba extension cords of varying lengths are available from your hobby dealer. Always use an extension of the proper length. Avoid plugging multiple extensions together to attain your desired length. If distance is greater than 18" or multiple or high current draw servos are being used, use Futaba Heavy-Duty servo extensions. Receiver Vibration and Waterproofing The receiver contains precision electronic parts. Be sure to avoid vibration, shock, and temperature extremes. For protection, wrap the receiver in foam rubber or other vibration-absorbing materials. It is also a good idea to waterproof the receiver by placing it in a plastic bag and securing the open end of the bag with a rubber band before wrapping it with foam rubber. If you accidentally get moisture or fuel inside the receiver, you may experience intermittent operation or a crash. If in doubt, send the receiver for service.

Range Testing Your R/C System Please note that different systems demonstrate different range checks and the same system will range check differently in different conditions. Also, the receiver antenna's installation affects the range test -- exiting the top of the model is ideal. This is a brief explanation of range test. For more in-depth specifics on receiver antenna mounting, additional checks if unsatisfactory range is demonstrated, range checking with gasoline powered engines, etc, please see our F.A.Q. page at Leave the transmitter's antenna retracted and be sure both batteries are fully charged. Position the aircraft away from wires, other transmitters, etc.
Test one - engine/motor off, minimum of 100 ft. range Have a friend view the model but not hold it, engine off. (People conduct signals, too!) Walk away from the model, working all controls constantly. Stop when the servos jitter significantly (a jitter here and there is normal), control movement stops (PCM), or you lose control altogether. Measure the distance. If greater than 100 feet, great! Proceed to Test 2. Less than 100 feet of range check means you need more information to determine if your system is safe to fly. Please see our web site or call support for additional tests to perform before flying your system. Repeat with friend holding the model. Note any differences. Test two - engine/motor on Repeat the test with the model's engine running and with someone holding the model. If a decrease of more than 10% is noted, research and resolve the cause of interference prior to flying your model.
What your fully operational system demonstrates is the normal range for your system in those conditions. Before every flying session, it is critical that you perform a range check. It is also required by the AMA Safety Code. If you notice a significant decrease in range with fully charged batteries, do not attempt to fly. The following frequencies and channel numbers may be used for flying aircraft in the United States: Aircraft (fixed wing and helicopter) Frequencies 50 MHz Band (Amateur Radio Operator "HAM" license required) 72 MHz band Ch. MHz Ch. MHz Ch. MHz Ch. MHz 11 Installing your frequency number flag: 19 It is very important that you display your 21 72.72.710 transmitting channel number at all times. To install your 22 72.72.730 flag, peel off the channel number's backing sheet, and carefully 23 72.72.750 stick the numbers to both sides of the number holder. Now you 24 72.72.770 can snap the number holder onto the lower portion of the 25 72.72.790 antenna as shown in the figure --- use the clip that fits more 26 72.72.810 snugly on your antenna. You may wish to cut off the other, 27 72.72.830 unused clip on the other side of the flag. 28

INPUTS: for 1 second. (If ADVANCE, to MODEL. If SELECT does not indicate 3, use MODEL SELECT, p. 25. to 5. for 1 second. sure? displays. *
Close. Where next? SELECT the copy you just made: see p. 25. Rename it (it is currently named exactly the same as the model copied): see p. 25.
*Radio shows progress on screen as the model memory is being copied. Note that if the power switch is turned off prior to completion, the data will not be copied.
MODEL NAME: assigns a name to the current model memory. By giving each model a name that is immediately recognizable, you can easily comfirm the correct model, and minimize the chance of flying the wrong model memory which could lead to a crash.
Adjustability and values: Up to 6 characters long. Each character may be a letter, number, blank, or a symbol. The default names assigned by the factory are in MDL-xx format (MDL-01 for first model memory, etc.)
NOTE: When you COPY one model memory over another, everything is copied, including the model's name. Similarly, if you change MODEL TYPE or do a MODEL RESET, the entire memory is reset, including MODEL NAME. So the first thing you will want to do after you COPY a model, change its type, or start from scratch, is rename the new copy to avoid confusion.
GOAL of EXAMPLE: Name model 3 "CAP-01" (where the underline represents a blank space.)
STEPS: Open MODEL submenu.
INPUTS: for 1 second. (If ADVANCE, to MODEL. If SELECTdoes not indicate 3, perform MODEL SELECT, p. 25. to C.
Confirm you are currently using the proper model memory. (Ex: 3) Go to NAME and change the first character. (Ex: M to C) Choose the next character to change. Repeat the prior steps to complete naming the model. Close. Where next?

to A Repeat.

Change the MODEL TYPE to helicopter: see p. 28. Change the receiver modulation setting from PPM to PCM or vice versa: see p. 28. Utilize servo REVERSE : see p. 31. Adjust servo travel with END POINT : see p. 32. Set up dual/triple rates and exponential (D/R,EXP): see p. 34.
PARAMETER submenu: sets those parameters you would likely set once, and then not disturb again. Once you have selected the correct model you wish to work with, the next step is setting up the proper parameters for this specific model:
What is the model's type? What type is the receiver's modulation [PPM(FM) or PCM]? Assign the desired SW to CH5 and CH7.
First it is important to clear out any old settings in the memory from prior use, using the MODEL RESET. MODEL RESET: completely resets all data in the individual model you have currently selected. Don't worry - there is no way you can accidentally delete all models in your radio with this function. Only a service center can completely reset your radio's entire memory at once. To delete each model in your radio's memory (for example when selling), you must SELECT each model, reset that memory, then go SELECT the next memory, etc. Note that when you COPY one model memory into another or change the model's type, you need not delete all existing data first by using this function. COPY completely overwrites anything in the existing model memory, including MODEL NAME. The MODEL TYPE function overwrites all data except name and MODUL.

Adjustability: channels 5 and 7 may be assigned to any SWITCH (A-H) or none (null). (for example, moving flaps to a switch) multiple channels may be assigned to the same switch. channels set to "NULL are only controlled by mixes. "
GOAL of EXAMPLE: Change channel 5 to switch D.
STEPS: Open BASIC menu then PARAMETER submenu. Go to channel 5 switch assignment. Change to D. Close.
INPUTS: for 1 second. (If ADVANCE, again.) to PARAMETER. to CH5-SW. to D.
Remember that if you assign primary control of a channel to a switch which you later use for other functions (like dual/triple rates or airbrakes), every time you use that other function you will also be moving the auxiliary channel. Servo reversing (REVERSE): changes the direction an individual servo responds to a CONTROL STICK motion. For CCPM helicopters, be sure to read the section on SWASH AFR (p. 63) before reversing any servos. Except with CCPM helicopters, always complete your servo reversing prior to any other programming. If you use pre-built ACRO functions that control multiple servos, such as FLAPERON or V-TAIL, it may be confusing to tell whether the servoneeds to be reversed or a setting in the function needs to be reversed. See the instructions for each specialized function for further details.
Always check servo direction prior to every flight as an additional precaution to confirm proper model memory, hook ups, and radio function. NOTE: THR-REV is a special function that reverses the entire throttle control, including moving the trim functionality to the Stick's upper half. To use THR-REV, turn off the transmitter, hold down the MODE and END keys, turn on. CURSOR DOWN to THR-REV and turn the DIAL to REV. Turn the transmitter off and back on. This change affects all models in the radio. GOAL of EXAMPLE: STEPS: Reverse the direction of the elevator Open REVERSE function. servo. Choose proper channel and set direction. (Ex: ELE REV) Close. Where next? Adjust servo travel with END POINT: see p. 32. Set up dual/triple rates and exponential (D/R,EXP): see p. 34. Set up flight timers: see p. 37. Set up trainer functions: see p. 38.
INPUTS: for 1 second. (If ADVANCE, to REVERSE. to ELE. to REV.
End Point of servo travel adjustment (E.POINT , also called EPA): the most flexible version of travel adjustment available. It independently adjusts each end of each individual servos travel, rather than one setting for the servo that affects both directions. Again, for CCPM helicopters, be sure to see SWASH AFR (see p. 63) prior to adjusting end points. Adjustability: Can set each direction independently. Ranges from 0% (no servo movement at all) to 140%. At a 100% setting, the throw of the servo is approximately 40 for channels 1-4 and approximately 55 for channels 5-8. Reducing the percentage settings reduces the total servo throw in that direction.
Examples: Adjust the throttle high end to avoid binding at the carburetor, and low end to allow for proper carburetor closure. Adjust flap so up travel is only sufficient for straight and level flight trimming, with full down travel. END POINT may be adjusted to 0 to keep a servo from moving one direction, such as flaps not intended to also operate as spoilers. Retract servos are not proportional. Changing END POINT will not adjust the servo.

END POINT adjusts only the individual servo. It will have noeffect on any other servo that is operated in conjunction with this servo via mix or preset programming such as FLAPERON , etc. This is so that each individual servo can be carefully fine-tuned to avoid binding and other conflicts. To adjust the total travel of a function such as FLAPERON, make the adjustments in that function's controls. For CCPM helicopters, adjust the total travel of the function, such as collective pitch, in SWASH AFR. Adjust the linkage or the END POINT? It is nearly always best to adjust your linkages to get as close as possible prior to utilizing END POINT. The higher the END POINT setting, the better position accuracy and the more servo power available at nearly any position (except if using digital servos). Higher END POINT values also mean longer travel time to reach the desired position, as you are utilizing more of the servo's total travel. (For example, using 50% END POINT would give you only half the steps of servo travel, meaning every click of trim has twice the effect and the servo gets there in half the time). end point (and moving the linkage) = torque, accuracy, but transit time to get there. end point (instead of adjusting linkages) = travel time, but torque, accuracy.
GOAL of EXAMPLE: STEPS: INPUTS: Decrease the flap servo throw in the Open END POINT function. again.) for 1 second. (If ADVANCE, upward direction to 5% to allow to END POINT. trimming of level flight only and down travel to 85% to prevent binding. Choose proper channel and set to flap. direction. (Ex: flap up 5%) flap control [default is VR ]. to 5%.* VR Close. Where next? Move auxiliary channels 5 or 7 to different switch(es): see p. 28. Set up THR-CUT to cut the engine: see p. 33. Set up dual/triple rates and exponential (D/R,EXP): see p. 34. Set up flight timers: see p. 37. Set up trainer functions: see p. 38. Set up twin aileron servos: see p. 43. to 85%.
*You can reset to the initial values by pressing the DIAL for one second.
Engine idle management: THR-CUT functions which work with the digital THROTTLE TRIM to provide a simple, : consistent means of engine operation. No more fussing with getting trim in just the right spot for landings!
Throttle cut (TH-CUT ) (ACRO/HELI): provides an easy way to stop the engine by flipping a switch (with THROTTLE STICK at idle). The movement is largest at idle and disappears at high throttle to avoid accidental dead sticks. In HELI, there is an additional setting, TH-CUT See p. 66.
GOAL of EXAMPLE: STEPS: Decrease the throttle setting (at idle) to Open BASIC menu, then open stop the engine with the flip of a switch. THR-CUT function. (default: SWITCH A in the down position) Activate the function. Choose desired switch, and the position which activates the function. With THROTTLE STICK at idle, adjust the rate until the engine consistently shuts off but throttle linkage is not binding.* Close. Where next?

FailSafe (loss of clean signal and low receiver battery) submenu (PCM mode only) (F/S ): sets responses in case of loss of signal or low Rx battery. FailSafe (F/S ): instructs a PCM receiver what to do in the event radio interference is received. Adjustability: Each channel may be set independently. The NOR (normal) setting holds the servo in its last commanded position. The F/S (FailSafe) function moves each servo to a predetermined position. NOTE: the setting of the throttle's F/S also applies to the Battery F/S (see below).
Examples: The F/S setting is used in certain competitions to spin the aircraft to the ground prior to flying away and doing potential damage elsewhere. Conversely, may also be used to go to neutral on all servos, hopefully keeping the plane flying as long as possible. Competition modelers often maintain the NOR function so that brief interference will not affect their model's maneuver. Set the throttle channel so that the engine idles when there is interference (ACRO). This may give enough time to fly away from and recover from the radio interference and minimize damage if crashed. For helicopters, NOR is typically the safest choice. We also recommend setting a gasoline engine's electronic kill switch to the OFFposition in the F/S function for safety reasons.
Updating F/S Settings: If you specify a F/S setting, the FailSafe data is automatically transmitted once each two minutes. When you choose the F/S mode, check that your settings are as desired by turning off the transmitter power switch and verifying that the servos move to the settings that you chose. Be sure to wait at least two minutes after changing the setting and turning on the receiver power before turning off the transmitter to confirm your changes have been transmitted. GOAL of EXAMPLE: Change the receiver FailSafe command for channel 7 (gasoline engine kill switch) to a preset position. NOTE: This is one of several functions for which the radio requires confirmation to make a change. STEPS: Open the BASIC menu, then open F/S function. Choose Channel to change. (ex: Ch. 8) Set and confirm fail safe command. INPUTS: for 1 second. (If ADVANCE, to F/S. to Ch 7. that controls channel 7 to desired OFFposition. to F/S. for 1 second to store.
Repeat as desired. Close. Where next? Wait two minutes and confirm F/S settings as described above. Read below for information on Battery FailSafe. Adjust END POINTs to gain proper F/S responses if needed: see p. 32. Adjust SUB-TRIM to gain proper F/S responses if needed: see p. 40.
Battery FailSafe (F/S ): a second battery low warning feature (separate from the transmitter low voltage warning). When the airborne battery voltage drops below approximately 3.8V, the PCM receivers battery F/S function moves the throttle to a predetermined position. When the Battery F/S function is activated, your engine will move to idle (if you haven't set a position) or a preset position. You should immediately land. You may temporarily reset the Battery F/S function by moving the THROTTLE STICK to idle. You will have about 30 seconds of throttle control before the battery function reactivates. Adjustability: NOR F/S setting for throttle results in Battery F/S going to the servo position reached by moving THROTTLE STICK to the bottom with TRIM LEVER centered; POS F/S setting for throttle results in Battery F/S also going to the same throttle servo position as the regular F/S.

Repeat as needed. to THR-CUT. to O F F. to SW. t o A-D O W N.
With THROTTLE STICK at idle, adjust the rate until the engine consistently shuts off, but throttle linkage is not binding.1
A to down position. THROTTLE STICK. to RATE. until shuts off.
Set up throttle curve for normal.2 (Usually changes will not need to be made prior to first flight.) P. 65.
Close. Open the THR-CV/NOR function. Adjust if needed. Close the function.
to THR-CV/NOR. to 95%. to next point. Repeat.
Set up collective pitch curve for normal as base of -4, center of +5, end of +8 to +10 degrees of blade pitch for aerobatics.2 (If just learning to fly, ask your instructor.) P. 65. Set up revo. mixing for normal. (For heading-hold gyros, inhibit revo.) P. 65.
Open the PIT-CV/NOR function. Adjust each point to match desired curve. (Ex first point: 89%.) Close the function. Open the REVO-MIX function. Adjust to your desired starting point. (Ex: 10%.) Close the function.
to PIT-CV/NOR. to 89%. to next point. Repeat.
to REVO-MIX. to ON. to 10%. to 15%.
Confirm Gyro direction. (Note: if using a heading-hold/AVCS gyro, use the GYRO programming for proper setup. See p. 72.)
With radio on, move helicopter's tail to the right by hand. The gyro should give right rudder input (leading edge of the tail rotor blades move left). If the gyro gives the opposite input, reverse direction on the gyro unit itself.
Be sure to follow your model' s instructions for preflight checks, blade tracking, etc. Never assume a set of blades is properly balanced and will track without checking. Check receiver battery voltage! Always check voltage with a voltmeter prior to each and every engine start. (Never assume being plugged in all night means your radio gear is ready to fly). Insufficient charge, binding servo linkages, and other problems can result in a dangerous crash with the possibility of injury to yourself, others and property. Confirm the swashplate is level at 0 travel. Adjust arms if needed. Apply full collective and check that the swashplate remained level and there is no binding. Repeat for full cyclic pitch and roll. If not, adjust as needed to correct in END POINT: see p. 32. Important note: prior to setting up throttle hold, idle-ups, offsets, etc., be sure to get your normal condition operating properly. Checking setup prior to going airborne: Check voltage! Then, with the assistance of an instructor, and having completed all range checks, etc, gradually apply throttle until the helicopter becomes "light on the skids." Adjust trims as needed to correct for any roll, pitch, or yaw tendencies. If the tail "wags," the gyro gain is too high. Decrease gyro gain. Where next?(Other functions you may wish to set up for your model.) THROTTLE HOLD: P. 67. SUB-TRIM p. 40 and separate trims for conditions (OFFSETS): p. 70. IDLE-UP p. 69. Rudder-to-throttle and other programmable mixes p. 53.

GOAL of EXAMPLE: Fine-tune hovering with the hovering adjustments. Remember these affect only the hovering (normal) condition.
STEPS: Open the HOV-PIT function.
INPUTS: for 1 second.(If basic, to HOV-PIT.
Adjust throttle and collective pitch curves until model hovers nicely. In flight, adjust collective pitch and Change VR to OFF. throttle curves near hover point Close. independently with HOV-THR and HOVPIT knobs. Open the HOV-THR function. Assign the dial VR. Store new settings after flight.
Store the current dial settings prior to setting HOV-THR function.
for one second to store. or VR to center. to OFF.

to HOV-THR. to ON.

In flight, adjust throttle curve near hover point with the knob. Store the current dial settings prior to selecting another model. for one second to store. or VR to center.
Close. THR-HOLD: see p. 67. Setting up the Idle-Ups: Throttle and Collective pitch Curves and Revo. Mixing (TH-CURVE, PIT-CURVE, REVO. MIXING for idle-ups: see p. 69. D/R,EXP: see p. 34.
GYROS : Using electronics to take some of the complexity out of setups and flight. What is a gyro? A gyroscope is an electronic unit that senses motion and corrects for it. For example, if the wind blows your helicopters tail to the left, a gyro will sense that motion (and confirm that no input was given) and will correct for it. How does it help in helicopter setup? A good gyro will totally eliminate the need for revo. mixing. The gyro will sense and correct the unwanted motion for you, so you don' t have to spend time to get a complex curve operating properly. Gyro sensor kinds: There are many different kinds of gyros. Early gyros were mechanical, with a spinning drum similar to a child' s gyroscope toy. The next generation utilized a special type of crystal, called piezoelectric, which sensed the motion and provided an electrical pulse. The finest gyros at the time of this writing are SMM technology. These silicone micro machines, or computer chips, sense the motion. SMM is far more accurate and less susceptible to inaccuracies caused by temperature changes, etc. Types of gyro responses: Normal: sense motion and dampen it (if the gyro rotates off course for 2 seconds, it corrects for 2 seconds). Heading-hold/AVCS: calculate the angle of rotation (by tracking the time/rate of change) and then provide correction until the same rotation is achieved. Stick priority: a feature on most high-end gyros. The more input given on the channel the gyro controls, the less sensitive the gain is automatically. This way, if you give a large input for a stall turn, for example, the gyro turns itself off and does not fight the stall turn. As you ease off the rudder, the gain increases again, minimizing tail wag and keeping the model straight. (If your gyro does not include stick priority, you can manually create it. Please see\faq\faq-7c.html.) Choosing the right gyro for your skills, your helicopter, and your budget: Mechanical: some are still available. They are very challenging to set up and not as reliable as piezo or SMM. Non-Heading-Hold Piezo: these are now inexpensive gyros that are reliable and easy to set up. Some have dual rates and remote gain control to adjust sensitivity in flight. Lack heading-hold capabilities for precision flying. Heading-Hold Piezo: Until recently, the cream of the crop. Expensive, and more complex to set up. Adds GPS-like heading recognition. Exhibits minor difficulties with temperature drift (position setting varying with unit's temperature). Heading-Hold SMM: 21st Century gyro technology. Computer chip technology. Expensive, easier set up, higher durability. Significant decrease in temperature sensitivity. Many include frame rate settings to allow faster response when using specialized digital servos. Examples: GY401: Simpler set up. Ideal for learning aerobatics through 3D. GY502: Better centering than 401 for more advanced aerobatics. Ideal through Class III competition. GY601: Exceptional center. Extremely fast response time. Requires specialized servo. GYRO: simplifies adjusting/selecting the gyro sensitivity, and can provide more than 2 gyro gain settings. (The higher the gain, the more correction the gyro provides and the "softer" or less responsive the helicopter feels.) This function makes the best possible use of the inflight adjustable gain of most gyros. Adjustability: Plug the gyro's sensitivity adjustment to channel 5 of the receiver. (not assignable) STD and AVCS/Heading-hold (GY) setup types available to simplify adjustments for AVCS/Heading-hold gyros. Full switch assignability or may select Cond.option. Each gyro setting may be set from 0 to 100% gain. Dual mode gyros (heading-hold/AVCS and normal) are easily triggered to each mode by changing the gyro settings sign. Larger percentages indicate more gain, or gyro responsiveness. Tail wagging or shaking indicates excessive gain settings. Turn down gyro setting until wag stops.

Gain Example for AVCS/Heading-hold Gyros (GY)
GOAL of EXAMPLE: Set up a heading-hold/AVCS gyro with heading-hold/AVCS setting in idle-up 1 and normal mode setting in idle-up2 and normal.
STEPS: INPUTS: Open and activate the GYRO function. for 1 second.(If basic, to GYRO. Optional: change Heading-hold (GY). gyro type to to GY. to SW. to E. to A80%. to A70%. to N70%. Close the function. D/R,EXP: see p. 34.

to ON.

Optional: change switch assignment. Ex: select E. Adjust gyro rates as needed. (Ex: NORM to A80%, IDL1 to A70%, IDL2 to N70% as starting points.)
GLOSSARY 3D: Common name for certain types of aerobatic maneuvers. Aircraft: flying below the models stall speed, such as torque rolls. Helicopters: combining 2 or more maneuvers, such as rolling loop. 4.8V: 4.8 volt battery pack, made of 4 Ni-Cd 1.2V cells. See Accessories. 5-cell: 6.0 volt battery pack, made of 4 alkaline cells or 5 Ni-Cd cells. See Accessories. 6V (6Volt): battery pack, made of 4 alkaline cells or 5 Ni-Cd cells. See Accessories. Accessories: additional optional items which may be used with your 7C.10 ACRO: model type designed for use with powered aircraft. Selected in the PARA submenu under TYPE ACT. Active. Make a feature able to be utilized. Opposite of INH. Only visible in certain features. Adjustable Function Rate: see SWASH AFR. Adjustable Servo Travel (AST): a specific type of end point adjustment. See END POINT. Adjustable Travel Limited (ATL): End point adjustment for low end only, for throttle channel. See ATL. Adjustable Travel Volume (ATV): an older, less specific term for end point adjustment. See END POINT. ADVANCE menus: Specific menus for each model type which allow the modeler to access and program the radio's more advanced features. AFR: Adjustable function rate. Used only in HELI model types with CCPM heads. See SWASH AFR. AIL-2: second aileron servo assignment. See Twin aileron servos. Aileron: surface that controls the roll of the model. Also called cyclic roll on a helicopter. Aileron-to-flap mixing: Mixing used to create full-span aileron action. Not a preprogrammed mix. See Programmable mix. Aileron-to-rudder mix: Mixing that automatically creates a "coordinated turn". Not a preprogrammed mix. See Programmable mix. Aileron Differential: Decreased down aileron travel when compared to up aileron travel. Minimizes "dragging" the low wing and creates more axial rolls. See Twin aileron servos.43 AIRBRAKE: (ACRO) Combines elevator and flap to suddenly slow the model for spot landings. May be triggered by THROTTLE STICK POSITION.52 AMA: Academy of Model Aeronautics. Non-profit organization governing model aircraft flight in the US.5 AST: Adjustable Servo Travel. See END POINT. ATL: Adjustable Travel Limited. Standard type of trim used for throttle, where the trim is effective only in the idle portion of the THROTTLE STICK POSITION. Normal trims affect the entire travel of the servo (ex: elevator trims), but ATL trims only the low end of the throttle movement, allowing throttle idle adjustments that don' t over-drive the servo at full throttle.31 ATV: Older, less clear terminology for end point adjustment. See END POINT. Autorotation: The ability of a helicopter to land safely without engine power, using the stored energy in the blade's rotation to produce lift for flaring.29

Backup battery: battery used to protect data storage in case of removal of master transmitter battery. In most Futaba radios, including the 7C, EEPROM data storage is used, so no backup battery is used or needed. BACKUP ERROR: transmitter's hard-coded memory has been lost. Send for service immediately.19 Base-Loaded antenna: also called Whip antenna. Aftermarket equipment not approved by Futaba. Basic model setups: guidelines to setting up the most basic models of each type.ACRO 22 HELI 58 BASIC menus: Specific menus with most commonly used features for each model type.ACRO 25 HELI 58 Battery care and charging. (Charging the Ni-Cd batteries).14 Battery FailSafe: determines how the receiver indicates an airborne pack low-battery warning. Defaults: 56% throttle, requires throttle to idle to override. To adjust the warning point, set a THROTTLE STICK POSITION in F/S. 41 BEEP: tone emitted by transmitter to signify a variety of situations. See Error messages. Binding: friction in a joint exceeding the movement of the linkage. Sticking or inability to continue movement. The servo continues to attempt to move the surface beyond its power/capabilities, rapidly draining battery power as it continues to struggle. Buddy Box: see Trainer box.
CCPM: Cyclic (pitch and roll) Collective Pitch Mixing. Multiple servos work in unison on the helicopters head to create one or more of the control functions. Ex: 3 servos set at 120 degrees operate the entire head. The 2 forward servos work together to rotate both the blades pitch and the roll cyclic (aileron) in a HR3head type. See MODEL TYPE,HELI. Charge: to increase the electrical energy, measured as voltage, available in a battery pack. See Battery care and charging. Condition: (HELI) separate flight setup that has significant adjustability separate from the basic model setup. See IDLEUP 1, 2 and THROTTLE HOLD. Contact information, North American Service Center.3 Copy model: see MODEL COPY. Crow: see AIRBRAKE(ACRO). Cursor: See SELECT BUTTONS. Cyclic: horizontal controls on a helicopter. Cyclic pitch is typically called elevator. Cyclic roll is typically called aileron.


Futaba 7CAP/7CHP Instruction Manual Addendum
Following are corrections to the Futaba instruction manual. Replace the instructions, notes and charts in the Futaba manual as indicated below. The best way would be to photocopy both sides of this addendum, then cut and paste the notes and charts directly into the instruction manual. Page 13 Replace the note under the chart on the bottom of the page with the following note: On the 7CA transmitters, the Top Left Switches are spring-loaded switch and 2-position switch. On the 7CH transmitters, the Top Left Switch is a 3-position with the spring loaded switch on the top right. Page 21 The following note refers to the Basic Menu 2 screen:
Note: FAIL SAFE only shows if the transmitter is set to transmit in PCM.
Page 23 Replace the two "INPUTS for EXAMPLE" in the top of the chart on page 23 with the inputs below: for 1 second. (If ADVANCE, to THR-CUT. to choose THR-CUT. again.)
Page 31 1. Cross out the statement next to the diagram of the computer screen near the top of the page that reads: (Ex: utilizing 2 channels for 2 rudder servos. See mixes, p. 53.) 2. Insert the following chart.
GOAL of EXAMPLE Change channel 5 to switch D.
STEPS Open the BASIC menu then PARAMETER submenu. Go to channel 5 switch assignment. Change to D. Close menu.
Page 35 1. Disregard the entire Special note for helicopters: 2. Replace the chart in the manual with this chart and the first one on the other side of this page.
GOAL of EXAMPLE Set up dial rates and exponential in ACRO mode.


INPUTS for 1 second. (If ADVANCE, to D/R, EXP. to desired channel. to 95%. to -15%. to 70% to -3%.


Choose channel and switch position. Set rate (Ex: high rate = 95%) Set expo (Ex: expo = -15%). Go to 2nd switch position and set rate (Ex: low rate = 70%). Set 2nd exp (Ex: expo = -3%) Optional: If using a 3-position switch, set 3rd rate. Close.
GOAL of EXAMPLE Set up dual rates and exponential in HELI mode. Note: In HELI mode the switch does not change the rate being adjusted. Change switch channel and switch position with mode button.
INPUTS for 1 second. (If ADVANCE, to D/R, EXP.
Choose channel and switch position. Set rate (Ex: high rate = 95%) Set expo (Ex: expo = -15%).
to desired channel and switch position. to 95%. to -15%.

Page 41 The graphic

to F/S should also appear next to the text OFF position in the chart.
Page 44 Replace the chart on page 44 with the chart below:
FLAP-TRIM allows the flap action to be set in a way that it can be adjusted with the VR dial. Airbrake will also move the flaps to a specified position via movement of a switch. The flaps can also be moved with switch using a programmable mix. See offset as master, p. 53.
GOAL of EXAMPLE Add FLAP-TRIM to allow the model's ailerons to drop 30% together as flaps from the VR dial. The FLAPERON function must be active with the second servo set to CH6.


INPUTS for 1 second. (If BASIC to FLAP-TRIM.
The function is automatically activated with the FLAPERON. Set the dial to desired zero flap side. Set the OFS so that the flap will work for the full range of the dial. Set the dial to desired full flap side. Set flap throw (Ex: 30%). Close. VR to 30% VR
Page 53 Cross out the following note from the Futaba instruction manual: To operate 2 or more servos for a single axis (such as two rudder servos). Page 68 1. Add the diagram of the computer screen below to the "TH-CRV" diagram in the manual:
2. Add the diagram of the computer screen below to the "PI-CRV" diagram in the manual:

Copyright 2004



Technical specifications

Full description

The Futaba 7C is one of the most affordable yet most functional 2.4GHz computer radio systems on the market today. The 7C is a system that offers much of the 9C's set-up versatility matched to 4-channel ease of use, what more could you want? Like all other Futaba computer systems, it offers Dial n' Key simplicity for programming, and the 2.4GHz FASST system for an unparalleled RF link. Other 7C features include R617FS FASST 7-Ch Receiver, 600mAh 4.8V NiCd Receiver Battery, NT8S600B 600mAh 9.6V NiCd Transmitter Battery, Switch Harness w/Charge Cord and a black Futaba neck strap. Servos are not included, so you can use the servos of your choice.



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