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KDS Flymentor 3D


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Here you can find all about KDS Flymentor 3D like setup card and other informations. For example: manual, gyro stabilizer system, setup, auto stabilizer, review.

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Comments to date: 8. Page 1 of 1. Average Rating:
CharlieR 10:28am on Tuesday, August 24th, 2010 
The camera is fairly thin, compact, sleek, great for carry along on vacation. My daughter had been using it non stop since day one. Especially.
wwwdotcom 8:45pm on Friday, July 23rd, 2010 
Sony Cyber-shot DSC-T50 is great camera in cyber shot series. nice cool camera Sony Cyber-shot DSC-T50 is great camera in cyber shot series.
amrc0308 5:06am on Sunday, July 4th, 2010 
This camera is amazing and it has never let me down for a minute. Quality photos during the daytime and easy to navigate as well. This camera is amazing and it has never let me down for a minute. Quality photos during the daytime and easy to navigate as well.
Scorpion2k5 5:59am on Friday, July 2nd, 2010 
The Sony camera has a good design: slim and stylish. You pay a premium for the Sony Brand though. For those that are into it, camera is touch screen.
fsb 6:10pm on Saturday, May 15th, 2010 
I am not a professional photographer, and thats not what this camera is made for. So I dont know why people are whining about picture quality. The T50 is a nice camera to use. The touch screen makes the many options easy to get to.
jabaker707 6:55pm on Thursday, April 15th, 2010 
should come with more instructions on how to use it to its full potentials more internal space great pic quality ; ease of use ; loooks hot as hell ;...
Iorwerth 11:52am on Thursday, April 15th, 2010 
I am not a professional photographer, and thats not what this camera is made for. So I dont know why people are whining about picture quality. The T50 is a nice camera to use. The touch screen makes the many options easy to get to.
jrvarma 7:43pm on Saturday, April 10th, 2010 
No good Good design, very compact. Image quality outside in day light is ok. Thats pretty much it..........indoor this camera is almost unusable. Sony T50 - Great Macro Magnifier & Video Use macro (magnifying glass) and video most of the time and it is awesome.

Comments posted on are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.




KDS Helicopter Balancer User Manual
Foreword..... 2 Caution.... 2 1. Summary.... 2 1.1 Introduce.... 2 1.2 Spec.... 3 1.3 Attentions.... 3 1.4 LED status.... 4 1.5 Using flow... 4 2. Connect to computer.... 5 2.1 Install driver.... 5 2.2 Adjustment and Saving... 7 3. Mounting stage.... 9 3.1 Setup transmitter... 9 3.2 Mounting Balancer.... 9 3.3 Adjust 'Mounting parameters'...11 3.4 Adjust 'Servos parameters'... 12 3.4.1 Servo Reverse.... 12 3.4.2 Servo neutral... 13 3.5 Adjust 'Control parameters'... 14 3.5.1 Stick reverse.... 14 3.5.2 Stick reverse.... 15 4.Flight Testing Stage.... 15 4.1 Adjust 'Gyro parameters'... 15 4.1.1 Gyro settings.... 16 4.1.2 Gyro Expert Setting.... 17 4.2 Adjust 'Advance parameters'... 17 4.2.1 Working mode... 18 4.2.2 Basic parameters... 19 4.2.3 Mode parameters... 19 4.2.4 Expert settings.... 19 5. Usage of Config file.... 20 5.1 Export to Cfg file... 20 5.2 Import from cfg file... 21 6. Restore factory settings.... 21 7. FAQ..... 22


Thank you for choose KDS Helicopter Balancer, it is an high performance intelligent device. The balancer is suitable for beginner, it can help you to keep the helicopter hovering and flying, made flying easy. To gain the best effect, you should configure your balancer according to your own condition, because the working of balancer relates to mechanism of helicopter. Before using balancer, we suppose you have know your helicopter well (such as movement of swash plate ), if you are not sure about these, it is recommend to find an old hand to help you.
*Attention: The software may be different from this manual because upgrading of the software. Please base on the software you are using, and refer to this manual.


It is necessary to learn proper technology for assemble and operate model. Be careful when operating. Improper mounting may cause serious damage or injury! KDS balancer is designed for civil model using only, please confirm it will not used on manned flyer or other device! The balancer provides an auxiliary control for model, you can not depend on it completely.

1. Summary

1.1 Introduce
The balancer is consist of three modules, Controller, Sensor and CCD. See Diagram1.1.1.


Device Connector Receiver Connect Line


CCD Sensor
Diagram1.1.1 Balancer modules WWW.KDSMODEL.COM 2
Controller: it is kernel of balancer, take charge of balance calculating and servos controlling. The Receiver Connect Line used to link receiver to obtain signal. The Device Connector used to link servos to control them. Sensor: used to induce the position of helicopter, and transform the signal to controller. Sensor must be mount on suitable place. Usually, the Sensor should be mount on the place which the gyro should be. CCD: used to 'see' ground to avoid drifting. To see ground effective, CCD should be mount on suitable place, and lens must face to ground, and CCD must 'see' ground well without any obstruction. KDS balancer has following functions: Control all movement, include attitude stabilization, speed control, position locking. CCD sensor to capture picture of ground, comparing pictures to avoid drifting. Switch working mode (horizontal mode and position mode) through AUX channel. Integrating head locking gyro and swash plate mixer. Control sense and mode of internal gyro through GEAR channel. Support swash 3S 120, 3S 140, 4S 90, 4S 90+45 Keep balance in inverted flight. Configure by computer through USB. If you are using FM/PPM remote control device, when losing control of transmitter, the balancer will set aileron, elevator, rudder to neutral, keep pitch, switch to position mode, and set position sense to 70%.

1.2 Spec

Voltage: 4.8-6.0V Current: 55mA (under 5V) Size: mmmmmm Weight: Temperature: 0~ +40 Maximum allows rotate speed: Aileron and Elevator: 200/ s Tail turning (if using external gyro): 360/ s

1.3 Attentions

It is very easy to configure and use balancer, but if you are a beginner, it is recommend to find an old hand pilot for help because of the complex adjusting of mechanism. During adjusting, please be careful about following: It is recommended to make electronic connection between tail pipe, motor shell and helicopter base for earth connection. If the tail drive structure is belt, you should pay more attention to this issue. Attrition between belt and metal will produce static electricity, and it will disturb other electronic device of helicopter.


Confirm all part of balancer have been mount on helicopter firmly, and the lens of CCD can 'see' ground, and you should keep the lens clean. The sensor of balancer (gyro) must be mounting horizontal. The balancer should keep away from engine and vent-pipe, because the vibration of engine will disturb sensor of balancer and the smoke from vent-pipe will cover lens of CCD. You may add magnetic ring on wires between controller, sensor and CCD to reduce electronic disturb. The wire should twist magnetic ring for three circles at least. Channels of aileron, elevator and pitch must be connected with receiver. Connections of gear and aux is optional. Wires which is unused should be locked to prevent unexpected affection. Slot of controller which is unused should be covered to prevent oil stain or oxidation. The maximum turning speed should not exceed 360/s, otherwise the balancer may work abnormally.

1.4 LED status

There are two LED in controller to indicate status of balancer, see following table: LED shine map Balancer status
No signal from receiver Balancer initial failed Under manual control Horizontal mode on Position mode on Balancer may be move during initial Manual control, balancer not working Under horizontal mode, no anti-drifting Under position mode, horizontal with anti-drifting CCD can not obtain enough contrast, can not switch to position mode, balancer working on balance mode automatically. *Attention: please refer to section 4.2.1 for detail of working mode


Red fast blink Red slow blink Red shine Red and Green shine Green shine

Green blink

Position mode failed

1.5 Using flow

The using flow of balancer is shown as diagram1.4.1. You can divide them into two stages, 'Mounting stage' and 'Flying stage'. In 'Mounting stage', you should complete the mounting of all device, then make all basic configuration so that the balancer can work normally. These basic parameters are called 'Mounting parameters'.


In 'Flying stage', you may adjust some advance parameters according to the result of flight-test, to reach best status you stratify. These advance parameters are called 'Flying parameters'.

Mounting balancer Connect to computer Adjust 'Mounting parameters'

Mounting stage

Adjust 'Flying parameters'

Disconnect from computer


Flight test

Connect to computer
Diagram1.5.1 Using flow of balancer

2. Connect to computer

2.1 Install driver
Configuring balancer must use a computer, you should take a computer with USB port and mouse, and it must has Microsoft Windows OS(Windows XP/Vista/Windows2000).

Plug into USB port

KDS USB adapter

Driver of USB adapter

Plug into balancer

Configure software

Diagram2.1.1 Connect balancer with computer
At first, please plug the USB adapter into balancer, then plug USB, refer to diagram2.1.1. When the computer notify you find new hardware and need driver, choose the KDSLINK.INF. After a while, the adapter will install properly. Then run HeliBal.exe , you will see the main interface of the configure software like diagram2.1.2.

Auto scan adapter

Connect status
Diagram2.1.2 Configure software
At beginning, the software will search KDS USB adapter automaticly, if it not found, a


balloon will show as diagram2.1.3. If so, please confirm the adapter was connected properly then click 'Retry'. If the apapter can not be found at all times, please contact your distributor.
Diagram2.1.3 Adapter not found
After adapter found, the software will try to communicate with balancer. If the balancer not power on, you will see 'No device' on status bar. Otherwise it will show 'Connected' after few seconds, shown as diagram2.1.4.
Diagram2.1.4 Balancer connected


don't power up balancer before adapter found.
2.2 Adjustment and Saving
Normally, you should read parameters from balancer before adjust, then change and saving. After balancer connected, click 'Read' button, see diagram2.2.1.

'Read' button

Diagram2.2.1 Read parameters
After reading, you will see configure page on the right side of the software, like diagram2.2.2. You can use mouse to drag them for fast tune or use keyboard (left or right) for find tune.


Parameter bar
Diagram2.2.2 Sample configure page
When adjust done, click 'Write' button (see diagram2.2.3) to save parameters.

Modify flag

Saving progress

'Write' button

Diagram2.2.3 Saving changes
The saving will cost few seconds, during saving, a bar will show to indicate the progress. If the 'Write' button is gray (disabled), it means the parameters you set is equal to parameters in balancer, and no necessary to write. If they are not equal, a exclamatory mark will show to notify you.

3. Mounting stage

3.1 Setup transmitter
Normally, the transmitter of helicopter model might has mixer, but KDS balancer has internal mixer, so you must disable the mixer of transmitter, otherwise the balancer can not work properly. All mixer relate to swash plate must be disable, and travel of aileron and elevator should be 100% (you may set some EXP to make better feel), the signal should be set to 1.5ms neutral. If you are using the internal gyro of balancer, all mixer relate to rudder must be disable.


Diagram3.1.1 Ensure no mixer *Attention: it is FUTABA remote system, if you are using JR remote system, please link servo to 2/3/4/6 channel.
To ensure you have disable all mixer properly, you should make a test system like diagram3.1.1. After power up, move the stick on transmitter, if each direction of each stick affects only one servo, that prove the mixers are all disabled successfully. Please read manual of transmitter carefully before make the operation.

3.2 Mounting Balancer

Firstly you should find a suitable place to mount balancer. The lens of CCD should face to ground, and the Sensor should be mount on the place which the gyro should be, see diagram3.2.1 for example. The controller can be mount in any place you want.


Mount CCD at side of helicopter, lens face to ground, the arrow point to front. Mount Sensor on flat at tail (or bottom of flat),the arrow point to front
Diagram3.2.1 An mounting example
*Attention: the arrow on CCD and the arrow on Sensor must point to same direction
After mounting of balancer, all electronic device should be connected. There is a internal gyro in balancer, so additional gyro is not necessary. Diagram3.2.2 is an example, the connection between receiver and controller should refer to following table.
See following table Balancer Controller Servo1


Servo2 Battery


ESC Tail Servo


Diagram3.2.2 Electronic connection Balancer Connector Black/Red/White Three pin Yellow solo pin Orange solo pin Gray solo pin FUTABA Receiver Channel 1 Channel 2 Channel 6 Channel 4 JR Receiver Channel 2 Channel 3 Channel 6 Channel 4
Connector Name Aileron/Power connector Elevator connector Pitch connector Rudder connector
Comment Must connected Must connected Must connected Must connected 10
KDS Helicopter Balancer User Manual Blue solo pin Green solo pin Gyro sense connector Balancer sense connector Channel 5 Channel 7 Channel 5 Channel 7 Optional, see 4.1.1 Optional, see 4.2.2
3.3 Adjust 'Mounting parameters'
The page 'Mounting' is some basic parameters relate to mechanism, they must be configure correctly so that balancer can work. The interface is shown as diagram3.3.1, there are three categories: mounting direction, rotor direction, swash plate type.

Diagram3.3.1 'Mounting' page
Mounting orientation There is an arrow print on Sensor and CCD of the balancer. You can point the arrow to any direction when mounting, but the two arrows must point to same direction (and lens of CCD must face to ground). Normally, the arrows is point to front (helicopter head). After mounting, you should set this parameter according to the arrows. Main rotor direction You can look in your rotor, record the rotate direction (clockwise or counter clockwise), and set this parameter. Swash plate type Select your swash plate type here.
*Attention: Please refer to chapter 2 for computer connection and parameters adjustment.
3.4 Adjust 'Servos parameters'
The page set servo reverse and neutral. See diagram3.4.1. The parameter about servo4, will only enable under four servo swash mode.
Servo Id refer to this picture
Diagram3.4.1 'Servo' page
*Attention: to avoid injury, please unmount rotary wing or shut off motor wires!

3.4.1 Servo Reverse

You must set reverse before adjust neutral. It is a little different from adjusting helicopter without balancer, the adjust should be done in balancer, not in transmitter! Please do it as following step: 1Ensure balancer is mount ok, and all electronic device have been connected successful. 2Turn on transmitter, ensure throttle stick on lowest position. 3Place helicopter on a horizontal surface, power up. 4Wait for balancer initialization finished. 5Lean helicopter to one side, look in the reaction of swash plate. If servo reverse


setting is correct, the balancer will control swash plate to the opposite side. That means when helicopter lean to left, the swash should lean to right (relative to main axis), when helicopter lean to front, the swash should lean to rear, etc. See diagram3.4.2.


Lean helicopter to left side

Swash lean to right

Correct balancer reaction
6If the reaction is wrong, connect balancer with computer, change reverse setting and save. (You can keep connection when do Lean-testing) 7Repeat step until reactions of all directions is correct.

3.4.2 Servo neutral

Servo neutral should be set after reverse is set ok. You should adjust neutral to make the rocker at suitable position. Normally, the position means angle between rocker and pole is 90, like diagram3.4.3.
Diagram3.4.3 Servo neutral
Before adjust neutral, you should make the neutral of mechanism on approximate position, then use software for find tune. You should aware that the neutral is mixed neutral, for example, when we adjust the aileron neutral of CCPM120, servo1 and servo2 will wiggle at the same time (opposite


direction). So you should adjust neutrals by following steps, suppose your swash is CCPM120: 1Adjust aileron neutral, make servo1 and servo2 same height. Don't care if the height is enough. 2Adjust elevator neutral, make servo1,servo2 and servo3 same height (swash plate was horizontal). 3Adjust pitch neutral, make the swash at proper height. Adjusting of tail servo and servo4 are independent, you should adjust servo4 after aileron, elevator and pitch.
3.5 Adjust 'Control parameters'
The page set balancer to fit the signal of transmitter. There are two categories in the page, stick reverse and stick travel, see diagram 3.5.1. In fact, these setting can also be set in transmitter, you can choose a way you like.
Diagram3.5.1 Control page

3.5.1 Stick reverse

Set stick reverse as following steps: 1Ensure balancer is mount ok, and all electronic device have been connected successful. 2Turn on transmitter, ensure throttle stick on lowest position. 3Place helicopter on a horizontal surface, power up. 4Wait for balancer initialization finished.


5Move each stick, record the reaction of swash plate. 8If the reaction is wrong, connect balancer with computer, change reverse setting and save. (You can keep connection when do sticks-testing) 6Repeat step until all reactions is correct.

3.5.2 Stick reverse

Set stick reverse as following steps: 1) Ensure balancer is mount ok, and all electronic device have been connected successful. 2) Turn on transmitter, ensure throttle stick on lowest position. 3) Place helicopter on a horizontal surface, power up. 4) Wait for balancer initialization finished. 5) Move each stick to its extreme position, record the move range of swash plate. 6) If the range is not suitable, connect balancer with computer, change reverse setting and save. (You can keep connection when do travel-testing) 7) Repeat step until all reactions is correct.

4.Flight Testing Stage

Normally, the default settings can be use for flight. But if you want better effect, you should adjust the 'Flying parameters'. This chapter will tell you how to adjust these parameters.
4.1 Adjust 'Gyro parameters'
There is a gyro in balancer, this page used to configure the gyro. You may use the default setting for mostly flying, but for advance user, it is necessary to make some adjusting to achieve better performance.

Diagram4.1.1 Gyro page

4.1.1 Gyro settings
1Gyro sense The sense of gyro can be set between -100 and +100. The positive value means the gyro working under 'heading hold' mode, negative value means the gyro working under 'normal mode'. It is recommended to using 'heading hold' mode. Same as other gyro, the sense should be as large as possible until the tail swing. If balancer has connected the sense channel of receiver, the setting in this page will be disabled, the gyro of balancer will use the signal from receiver as sense value. If you do not want to modify sense value frequently, you can keep the sense channel empty (the blue line), then the channel on receiver can be use for other using. 2Yaw rate This parameter controls the changing speed of direction. Normally, the value should be set to maximum, but if you do not like fast changing of direction, you may adjust it as you want. 3Yaw expo This parameter controls the exponent of rudder. Little value will cause fine response in slim motion of stick. You may adjust it as you want. 4Pitch to tail mix This mix can improve effect when pitch changing. You can choose a suitable value, to


make better response of gyro to pitch changing. 5Servo travel limit This parameter controls the signal for tail servo, to avoid mechanical conflict of tail pitch structure.
4.1.2 Gyro Expert Setting
1Sensor gain The parameter controls the gain of signal amplifier, you may not modify it in most case. 2Tail delay The parameter used to fit feature of tail servo. The response speed of tail servo is more slow, the parameter should be more large. If some high quality servo are used, you should set a little value, such as 0. 3Head holding angle range The parameter controls the inertia of turning. The inertia means the extra rotation when you make a direction turning. When you begin moving the rudder stick, it will cause a rotation (head direction changing of the helicopter), when you stop moving the rudder stick, the helicopter will not stop rotation immediately because of the inertia, it will rotate an extra angle before stopping. The parameter controls the angle.

4.2 Adjust 'Advance parameters'
The page controls working mode of balancer. It is strongly recommended keep them as factory setting when you do not know them well.
Diagram4.2.1 Advance page

4.2.1 Working mode

The balancer has two working mode: horizontal mode and position mode. See section 4.2.2 for details of mode switching. 1Horizontal mode Make helicopter horizontal automatically. In this mode, helicopter can keep horizontal flying, do not affected by illumination or temperature, but ground effect and airflow are still affect helicopter. It is recommended when indoor flying. 2Position mode Make helicopter horizontal and keep its position automatically. The mode can make helicopter hovers on a fixed point automatically, the valid height (relative to ground) is 0.3~3 meters. When hovering, you can release aileron and elevator sticks of the transmitter, the balancer can make helicopter hovers on a fixed point automatically. Lack of illumination or changing of temperature will affect position. But even if the position affected by environment, you can still fix the drifting easily. When you are making a air route under position mode, there are only two things you need to do: control elevator stick for forward or backward, control rudder stick for direction.

4.2.2 Basic parameters

1Balancer sense The parameter controls sense of attitude changing of helicopter. Negative value make balancer enter horizontal mode, positive value make balancer enter position mode. Zero value will shutdown balancer, in the time the helicopter is controlled by pilot at all. If AUX channel is connected to receiver, the parameter here will be disabled. Balancer will decide working mode and sense by the signal output by receiver. 2Neutral roll attitude The parameter controls attack angle when stick on neutral position. It is recommended to keep default value for fresh pilot. *Attention: It is recommended to choose a three-status-switch for balancer sense (AUX channel). By set negative,positive and zero value relative to the three status, you can switch working mode between horizontal mode, position mode and manual mode. And it is very important to control the helicopter yourself when switching!

4.2.3 Mode parameters

1Total sensor gain The parameter controls gain of signal amplifier for internal gyro. Keep default value in most case. 2Stick sensitivity gain The parameter controls gain of signal amplifier for receiver. Keep default value in most case. 3Position sens. gain The parameter controls gain of signal amplifier for CCD. Keep default value in most case. 4Forward freewheel When using position mode, balancer will try to move helicopter to a place. After helicopter arrived the place, it will keep moving a little distance because of inertia. This parameter controls the affection of inertia, 'free' means large inertia, 'firm' means little inertia.

4.2.4 Expert settings

Parameters in this section is designed for old hand. For a newer, it is recommended to keep default value.
1Manual override ability Because pilot and balancer are controlling helicopter at same time, so balancer must mix the two control signals. This parameter controls scale of mixer. Large value means more manual controlling. 2Elevator gain The parameter controls gain of signal amplifier for sensor of pitching axis. Keep default value in most case. 3Stick response acceleration The parameter controls response speed of balancer for stick motion. Keep default value in most case. 4Positioning speed The parameter controls location speed. Large value means faster control, and helicopter will arrive the place more quickly.

5. Usage of Config file

Config file can be using for multiple helicopter. You can export parameters to a cfg file after adjustment with one helicopter, then you can mount balancer on other helicopter and change settings for it. When you want to use balancer on the old one, you can import parameters from the cfg file.

5.1 Export to Cfg file

Click 'Save' button, then choose the file location, name it, all the settings will be exported into the file.

'Export' button

Diagram 5.1.1 Export config file
In fact, the parameters be exported is parameters in the software interface, not parameters in balancer. So if you want to export parameters in balancer, you must execute a 'Read' operation without any modification before exporting.

5.2 Import from cfg file

Click 'Load' button, then choose the file, settings will be import from the file without any other notification.

'Import' button

Diagram 5.2.1 Import config file
After importing, you must click 'Write' button to save them into balancer, because the importing only load parameters to the pages for adjusting. *Attention: the exporting and importing of config file is all base on the software interface. In another words, when importing, the software loads parameters from config file and updates the elements on the pages, when exporting, the software makes parameters from pages then store them into config file.
6. Restore factory settings
After many times modification, the effect of balancer may be terrible, then you can use this function to restore balancer to factory settings. Click 'Reset' button, settings on screen will restore to factory default value, then click 'Write' button, settings will be save into balancer after progress bar shows finished.

'Reset' button

Diagram 6.1 Reset to factory settings
*Attention: if 'Write' function did not be execute, the factory setting would not be save into balancer.


7. FAQ
Q: Servos has no action A: Refer to section 1.4, make sure the balancer is working properly. Q: Helicopter dithering under position mode, especially when flying near ground. A: Check following items Decrease balancer sense, see section 4.2.1. If AUX channel is using, modify sense in transmitter, if not, modify it in software. The mounting place of CCD may be too lower, you may try to mount it higher. Try to increase the travel of aileron and elevator. May be there are something enter eye shot of CCD. May be some plants swing under helicopter and they are in eye shot of CCD. If then, you should switch to horizontal mode. Q: Flight is not stable, especially when flying in upper air A: Clean lens of CCD frequently, and the lens should keep away from vent-pipe. Q: How to fly above low contrast environment? such as snow ground, water surface. A: Position mode can not be used in these environment, you must switch to horizontal mode. Q: How to modify balancer sense? A: If AUX channel is using, modify sense in transmitter, if not, modify it in software through PC. It is recommended to keep AUX empty because balancer sense may not be adjust frequently. Q: There are thick smoke in eye shot of lens, what can I do? A: Don't let engine rich oil, and keep lens away from vent. Q: Flight is not stable under horizontal mode and position mode both A: May be vibration cause balancer working abnormality (especially when use oil engine), you can try to add sponge between balancer and helicopter. Q: The swash actions when open/close balancer A: Because balancer need a few seconds to make sync with helicopter when the working mode is changed. See 4.2.2 for more details, and see following items Balancer will take effect in several seconds by degrees after helicopter take off. The environment temperature may change sharply (for example, from your car to ground), please leave helicopter and balancer in the flying environment for five minutes at least before power on. Serious vibration may exists, refer to previous question. Q: There are drifting after turning


A: Check following items The sensor may not be mount horizontal, You are flying a helicopter with large attack angle rotor Confirm the neutral signal of transmitter is 1.5ms Keep helicopter static, check the tail pitch is fixed. If the tail pitch is moving when helicopter static, make fine tune of rudder to stop it. Q: There are drifting when changing between hover and invert hover A: Check following items Try adjusting parameters of 'Neutral roll attitude' The speed of rotation of helicopter may exceed 360/ s You may execute a serial aerobatic flight.



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