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Model Forum / Radio Controlled / Helicopters / March 2008Off Topic... pondering the use of a Gyro and Servo to augment pitch stability in a sailplane (full size)
I think that if I wanted to make this work, I'd need to provide more than just power to a gyro/servo combination. I'd probably also need to have a circuit that would send neutral position information to the gyro as if it was plugged into a receiver. Maybe I need more than that? If you're EE inclined and have an interest in offering some thoughts, please send me an e-mail. Thanks, Mark >I think that if I wanted to make this work, I'd need to provide more than >just power to a gyro/servo combination. I'd probably also need to have a [quoted text clipped - 3 lines] > If you're EE inclined and have an interest in offering some thoughts, > please send me an e-mail. I'm not convinced this is allowed under either FAA or CAA rules.  SignatureBeav VN 750 Zed 1000 OMF# 19 >> I think that if I wanted to make this work, I'd need to provide more than >> just power to a gyro/servo combination. I'd probably also need to have a [quoted text clipped - 5 lines] > > I'm not convinced this is allowed under either FAA or CAA rules. not sure how you would interface it either, as its ok on a model as you don't physically move the controls in a model, you move the control surface through the gyro. unless you rigged up the input to the gyro to read the position of the joystick and used the output to control the trim tab rather than the main surface SignatureKevin R Reply address works >I think that if I wanted to make this work, I'd need to provide more >than just power to a gyro/servo combination. I'd probably also need to >have a circuit that would send neutral position information to the gyro >as if it was plugged into a receiver. Maybe I need more than that? Yes, you'd need something to provide two pulse trains to the gyro: one to emulate the elevator control output of a receiver, and one to control the gyro mode. And you'd probably want manual control inputs to both. Plus, what Beav said. If your glider is certificated Normal, it's an unauthorized airframe modification: the FAA and your insurance company will have one cow each. If it's certificated Experimental, you may be OK. And what's the point? The most this thing will do is keep the glider from going out of control while you use the pee bag, and for that purpose, between a pitch controller and a wing leveler I'd take the latter. rj >I think that if I wanted to make this work, I'd need to provide more >than just power to a gyro/servo combination. I'd probably also need to [quoted text clipped - 7 lines] > >Mark In the early 1980's there was an experimental autopilot that used an RC servo and an inertial sensor rather than an autopilot to stabilize the flight characteristics of a full size airplane. It was developed by NASA at Langly as I recall. The RC servo "flew" a trim tab for control functions and therefore was easy for the pilot to over power. As I recall, there was a professor at Ohio State University who utilized the unit in an EAA Thorpe. I don't know if the EAA folks have archives of this sort of thing but I think I attended a seminar about the device at the 1982 Oshkosh fly in.... John Ferrell W8CCW Beware of the dopeler effect (pronounced dope-ler). That's where bad ideas seem good if they come at you fast enough. > I think that if I wanted to make this work, I'd need to provide more > than just power to a gyro/servo combination. I'd probably also need to [quoted text clipped - 7 lines] > > Mark Does anyone know where I could find the specs for the pulse that the Futaba receiver is generating. >Does anyone know where I could find the specs for the pulse that the >Futaba receiver is generating. The portioning pulse is between 1 and 2 milliseconds. It needs to be repeated every 30 milliseconds or so. To develop maximum drive power from a given servo it is important to send the positioning pulse and the rated interval. Please Google "RC servo" and you will find all you wanted and more on the subject. I find the Robot Groups have more useful ideas than the RC groups. John Ferrell W8CCW Beware of the dopeler effect (pronounced dope-ler). That's where bad ideas seem good if they come at you fast enough. |
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