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Mar 30, 2008, 01:27 AM
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The war on swashplate nonlinearities

The problem with swashplates is they don't convert servo angle to lift very accurately. Every pushrod, reduction arm, & control horn from the servos to the blades is nonlinear & talks to each other. Collective lift for neutral cyclic is always different than collective lift for steep cyclic.

The ideal CCPM converts the sticks to an exact lift for every phase in the rotor disc, but we can't measure lift very accurately. Lacking direct lift measurements, the plan is to measure blade pitch for every phase. Mount an LED jig on a blade grip & videograph the pitch for the entire range of servo positions. Repeat with the phase in 120' increments.

Then the computer converts the sticks to pitch for 3 phases in the disc. A neural network converts the 3 pitch values into servo values. Hopefully that gives U a smoother ride.

The trick is synchronizing the video with the test program & keeping the head from turning during the test program.

Have our first daylight timelapse in HD.

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