That's right Tim, including rotor blade design. I have flown different brands of blades on the same machine, and found that they vary considerably in the stability, and trim spring to airspeed sensitivity.Chuck Beaty said that a guy he knew back in the 70's did some testing with springs of differing rates to achieve the best requirement to suit his machine.Where did Dewie say he had a problem?Aussie Paul. [
]www.firebirdgyros.com

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