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Nov 25, 2008, 04:29 AM
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pinhead on steroids


Well 4 U quad rotor fans, vibration is still as problematic as it was on the unicopters. The quad may vibrate less, but it's so freakishly more unstable than a unicopter, U need higher bandwidth filters. Plus, U need the attitude estimation to work fulltime. There's no manual override if the IMU starts drifting.

Designing a quad rotor from the ground up is like designing a T-Rex from scratch. Holy pile of work. Makes U wonder what those Chinese T-Rex designers consider a mortgage bailout. You're really best off buying finished & proven quad rotor electronics from someone else instead of developing your own.

Now today's discovery.

Suppo ESC's only go up to 2ms on the PWM. Slightly below 2ms, the ESC hits maximum power. If U go higher than 2ms, the ESC limits power to the maximum & shuts down after a certain amount of time, usually in flight. It emits a repeating beep to indicate signal lost & it disarms. Then if U pull back to 1ms it emits a different beep to indicate it's armed again.

The second time it arms, it normalizes idle to 1ms instead of 0.8ms, so U can't balance the quad rotor again until resetting it.

Got the quad rotor up again. Major oscillations resolved. Minor oscillations still there. Manual hover was going smoothly. Seemed 2 B plenty of power, thanks to some software tweeking. Autopilot tests were disasterous. Had some crashes due to the lack of space. For battery #2, had 1 slow heading drift. Then the random nose dives began. Some more crashes & that was it.
Last edited by Jack Crossfire; Nov 25, 2008 at 04:48 AM.
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