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end of the day, the large majority of you will only need to look at those parameters, which are 
listed in the main tab of AvrConfig. The parameters can be categorized as follows: 
 

 

controller parameters 

setup parameters 

 

 

Version Number: 

This single field gives the version of the installed firmware. 
 

Setup Parameters: 

With these parameters the gyro is matched to your heli. Adjusting these parameters is, so to say, 
part of the installation of the gyro in your heli, and normally they have to be adjusted only once 
(as long as the heli mechanics is not changed). The setup parameters are: 
 
- Gyro Orientation 
- Servo Type 
- Servo Direction 
- Servo Mid 
- Servo End Right, Servo End Left 
 

Controller Parameters: 

This set of parameters adjusts the behavior of the gyro (or built-in controller in fact). Obviously, 
once the setup parameters are set, the controller parameters are the important ones to play with. 
The nine parameters in this section are listed below. However, 

IMPORTANTLY

, not all of them 

are always active! Which ones are active and hence need only be considered depends on your 
choice for the parameter Gain Input Function and the method for debouncing piro stops. 
 
- Gain Input Function 
- Gyro Mode 
- Rate Gain 
- PID Gain 
- PID I 
- Debounce CCW, Debounce CW 
- De-/Acceleration Limit Right, De-/Acceleration Limit Left 
 
+ gain as set via the transmitter 
 

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Summary of Contents for GA-250

Page 1: ...t a fundamental level seems to be different from what is used in commercial gyros Many things of course do hold for any gyro also the GA250 OW and your previous knowledge on gyros is not worthless A second important comment is that this is NOT a tutorial on gyros per se There are many excellent writings and videos on the net and it is assumed that the gyro basics are understood by the reader This ...

Page 2: ...tup parameters are Gyro Orientation Servo Type Servo Direction Servo Mid Servo End Right Servo End Left Controller Parameters This set of parameters adjusts the behavior of the gyro or built in controller in fact Obviously once the setup parameters are set the controller parameters are the important ones to play with The nine parameters in this section are listed below However IMPORTANTLY not all ...

Page 3: ...w youtube com watch feature player_embedded v QvI nW9XcvU the movie is in German but it should be self explanatory 3 2 Servo End Points The next step is to adjust the servo end points such that the tail bridge doesn t bind maybe you want to leave 0 5 mm space but on the other hand the maximal travel range is available to the gyro Servo End Right determines the maximal travel range for the rudder s...

Page 4: ... 90 for the servo horn but rather have it tilted towards the direction in which it has to be turned less for the full pitch slider range TRex450 tilted towards the main frame 4 The Parameter Gain Input Function The parameter Gain Input Function determines what the GA250 OW does with a signal at the gain plug The behavior of the gyro does in fact depend strongly on this setting The Gain Input Funct...

Page 5: ...compensation as known e g from FBL units 5 The Controller Parameters It is important to understand that not all controller parameters are active at all times The GA250 OW can be set into different working modes and which parameters are active inactive depends on the working mode As the inactive parameters can totally be ignored this implies that in practice you usually don t have to deal with all ...

Page 6: ... Acceleration Limit Left the parameters Debounce CCW and Debounce CW are still active but should not be used and set to their default 30 0 Active Controller Parameters gyro gain set either via the transmitter or via PID Gain PID I De Acceleration Limit Right De Acceleration Limit Left If you have chosen Gain Input Function set gain mode which is assumed here the actual gyro gain is determined by y...

Page 7: ...l what the desired position was before a disturbance wind gust pitch pump etc occurred Such a memory is available in heading hold mode and enabled by the parameter PID I As before for gain the gyro could react aggressively to a difference between the actual tail position and its memory of it or could do so slowly The value of PID I determines how aggressively the gyro takes into account its knowle...

Page 8: ...d do the trick but finding a good one is obviously the challenge The debounce mechanism implemented in the GA250 OW firmware guesstimates how long the actual stop will take and cheats the heading hold such as to produce a stop without back bouncing The first method is so to say the textbook solution and to the best of my knowledge implemented in most if not all commercial gyros and FBL units and k...

Page 9: ...om there The tail may now show some very small wags at each stop Reduce gain a bit 4 Pre Flight Tests Go flying and adjust your gain until there is no wagging in any flight situation Usually adjustments based on test maneuvers such as piros or pitch pumps lead to slightly too large gain Tip 1 If the gain is adjusted via the transmitter see chapter 4 the GA250 OW invokes a gain stabilizer which is ...

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