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Feb 14, 2008, 06:54 AM
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Death of a flybar


Had a wind advisory & 25mph wind in Rain Ramon, so that grounded autopilot operations. High wind is predicted until Saturday.

The answer is yes. Software tail gyro works. The trick was moving the feedback to the PIC, making the A/D conversion -> PWM route as tight as possible. It didn't need a log curve or lowpass filtering, just a straight P term. The result was a very stiff rate damper without oscillation. Results may actually have been better than the PG-03, but in very high wind of course.

Success with software rate damping means we can start flybarless testing.

Mounting the Canon A560 is going 2 B all but impossible with the flybar. Unfortunately if flybarless is too unstable, will need full time software attitude hold in addition to software rate limiting. Instead of setting absolute angles, cyclic would increment absolute angles by fixed amounts. Unlike manual flight, releasing the stick would freeze attitude.

Unfortunately it means never flying an RC copter manually again. Relearning the skill to bring up a future airframe would be hard.

Since flybarless testing can be devestating, plans for flybar testing have ranged from using the test stand from https://www.rcgroups.com/forums/atta...mentid=1337158 to minimizing collective to resetting throttle back to minimum values. The trick with the test stand is to mount Vicacopter upside down.
Last edited by Jack Crossfire; Feb 14, 2008 at 07:05 AM.
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Feb 14, 2008, 07:42 AM
Your attitude is your alt
Gary Morris's Avatar
Jack, go into your swash menu and all you do is leave the pitch setting at 60% and reduce your other two setting to something like 40% or 35% and then do a test. As you said you do not want to reduce your pitch, just your aileron and elevator settings. Hope this helps.

Gary
Feb 14, 2008, 11:16 AM
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Originally Posted by Gary Morris
Jack, go into your swash menu and all you do is leave the pitch setting at 60% and reduce your other two setting to something like 40% or 35% and then do a test. As you said you do not want to reduce your pitch, just your aileron and elevator settings. Hope this helps.

Gary
Gary, he use a custom TX (based on Zigbee communication module 2.4Ghz, I think). So no swash menu for him ... unless he create one

https://www.rcgroups.com/forums/showthread.php?t=803331

Kos


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