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Gyro for Rudder on 3D Plane
Submitted by admin on Mon, 01/25/2010 - 1:06pm.
I was wondering which Gyro you recommended since JR no longer makes the G500A. I was told the 7703D would be a good choice. If so what do you recommend a starting position for the gain should be? Between 1%-49% I assume in order to disable the tail lock.Thanks
Damon
Damon, I suppose it depends
Damon,
I suppose it depends on the size of the model. The 770 is a great gyro and you're correct that you should be in normal mode (rate) which is 50%-0% [equivalent to (0-100%)]
Recently I've been playing with relaxed stability airplanes and have used a pair of the G110 gyros for pitch and yaw rate feedback. Start as low as you can handle(I'd start near 47-45%=5-10% and work up from there)...if you get the gain too high the control surface will oscillate.
Certainly the typical 3D model needs no feedback to be controllable and will most likely never be statically or dynamically stable with only rate feedback; however, the time before the state (yaw rate in this case) goes divergent will be increased. Basically with feedback you'll have more time to think.
Another thing to consider is the connection between the servo and rudder. Once you have feedback in the loop you will want to minimize any freeplay or slop you may have in your setup. Feedback can introduce oscillatory modes of motion which find resonance at even low gains if there is freeplay or compliance(stiffness) coupled with a control surface having large interia.
I hope this helps...all the best,
George Hicks
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