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Old Feb 11, 2011, 10:12 AM
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South East Texas
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Testing Gyros on the flying wing...

I just did a test on the small flying wing… I put a gyro on the right ailevon to
control pitch and one on the left ailevon to control roll…. I had no idea what it
was going to do but hoped it would work…. Well it did work and it worked
better than I expected… The thing is rock steady…..

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Old Feb 12, 2011, 01:53 PM
Molon Labe
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United States, CA, San Luis Obispo
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Thats interesting because as the elevator gyro would attempt to correct for pitch, it would start to roll the wing because it is only acting on one of the ailerons. The other gyro (aileron gyro) would then see this roll change, and try to stop it, effectively moving that surface in the same direction as the other, correcting for the original pitch change. (and the same works for when the wing would try to roll. The roll gyro would start to correct, pitch the wing, and the other gyro would correct for that pitch change, effectively adding aileron input...)

I never thought of this before, but it could be a good way of using gyros on a wing.

Good work
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Old Feb 12, 2011, 02:03 PM
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Quote:
Originally Posted by BpPilot View Post
Thats interesting because as the elevator gyro would attempt to correct for pitch, it would start to roll the wing because it is only acting on one of the ailerons. The other gyro (aileron gyro) would then see this roll change, and try to stop it, effectively moving that surface in the same direction as the other, correcting for the original pitch change. (and the same works for when the wing would try to roll. The roll gyro would start to correct, pitch the wing, and the other gyro would correct for that pitch change, effectively adding aileron input...)

I never thought of this before, but it could be a good way of using gyros on a wing.

Good work
Exactly.... I haven't completely thought it out but, I think you HAVE to
have 2 gyros for it to work....I am not sure if it would work with just one
gyro on one side.... I think it would cause problems...
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Old Feb 12, 2011, 02:24 PM
Molon Labe
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You would have to use a mixer if u wanted to use just one gyro. If u just wanted to have a pitch gyro, you would put the gyro between the rx and the mixer. When the wing started to change pitch, the gyro would correct and override the rx signal to the servo, or mixer in this case.

The way that you did it is the only way that i have ever seen that would not require a mixer.
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Old Feb 12, 2011, 03:03 PM
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Agreed
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Old Feb 12, 2011, 06:22 PM
Storm Runner guy
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Now as you guys have explained how it does it, I can understand all this..can we have a vid of the action by any chance ?

Or, inaction as it probably is
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Old Feb 13, 2011, 12:58 AM
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Now as you guys have explained how it does it, I can understand all this..can we have a vid of the action by any chance ?

Or, inaction as it probably is
Are you looking for action in flight or just in general?
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Old Feb 13, 2011, 07:50 PM
Waiting for the paint to dry.
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Pasadena Maryland
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+1
my project could use some of your testing vid if you can.
it look like a vary good idea!
T
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Old Feb 15, 2011, 07:29 AM
Will work for foam
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United States, WI, Muskego
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mamcrackin - what a great idea. i would have never thought to try it that way. I am seriously considering putting gyros in my FPV wing and this looks too good to be true, but will use it if i can.

what i really want to know is there any wobble due to latency of the reactive gyro/servo? For instance when the pitch gyro/servo senses a pitch change and initiates a correction, there must be some lag before the other (reactive) gyro/servo compensates with its adjustment. Is it enough to be visable or is it truly rock steady?

i understand how it works (and obviously it does), but is it as good as having the two gyros feed a elevon/v-tail mixer then go to the servos?
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Old Feb 15, 2011, 08:02 AM
Blackfly
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http://shop.fyetech.com/product_info...products_id=30

Gyros work just fine, but the FY stab systems are just dead simple, and cheaper than two gyros.
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Old Feb 15, 2011, 09:02 AM
Will work for foam
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United States, WI, Muskego
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Blackfly - I cannot currently view the link (nothing wrong, just local firewall). Are you talking about the OSD and stability system? How much does it cost? Gyros are $20 ea at hk.

Im going to set up a wing with this gyro setup in RealFlight and see how it works out.
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Old Feb 15, 2011, 10:05 AM
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Quote:
Originally Posted by wingnutt View Post
mamcrackin - what a great idea. i would have never thought to try it that way. I am seriously considering putting gyros in my FPV wing and this looks too good to be true, but will use it if i can.

what i really want to know is there any wobble due to latency of the reactive gyro/servo? For instance when the pitch gyro/servo senses a pitch change and initiates a correction, there must be some lag before the other (reactive) gyro/servo compensates with its adjustment. Is it enough to be visable or is it truly rock steady?

i understand how it works (and obviously it does), but is it as good as having the two gyros feed a elevon/v-tail mixer then go to the servos?
You are welcome.... I did more testing today by turning up the sensitivity
in the gyros and it caused a lot of waggle in the control surfaces.... I
turned the sensitivity back down and it is very smooth..... The faster you
fly, the lower you want to set the sensitivity.... I have mine set at about
1/8th turn from the minimum and there is no rocking or wobble that is
visible.... I do not have any external mixers so I can't do the comparison
you might be looking for.... I would imagine that if I set both gyros on the
same axis, it would then control either elevator or aileron throws but I
can't say that for a fact as I have not tried that configuration...
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Old Feb 15, 2011, 11:11 AM
Will work for foam
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United States, WI, Muskego
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Great information! thanks again. I will see if I can capture the airspeed from my OSD/logger and use it to control the gyro sensitivities via a PIC or something. that way it will automatically increase sensitivity at low speed then reduce at higher speeds. would be nice to modulate the control input quantity as well so that it reduces the sensitivity when large control inputs are used (rolling or loops). FUN FUN stuff!!
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Old Feb 15, 2011, 12:37 PM
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Mamcracken:

I would like to know more about the gyros you are using, type, brand, cost, source.

Thanks!
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Old Feb 15, 2011, 12:39 PM
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Blackfly:

The device you link to looks really good, but they appear to be out of stock. Do you know any other place to purchase this device?
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