Never Mind. Should have finished reading thread before asking questions.
Thanks Tony. Steve Meyer SOAR LSF IV At 11:36 AM 9/26/2006, Mark Drela wrote:
First of all, if the glider is being pulled level, the winch doesn't see the weight, only the drag. The drag is tiny compared to the winch's pull capability, so it will be spinning at nearly its zero-load speed. I think a typical Ford LS 6V has Kv=350 rpm/Volt, so at 12 Volts it will be spinning at rpm = 350*12 = 4200 rpm = 70 rps With a 3" diameter drum, the line speed will be 3" * pi * 70 rps = 660 in/s = 55 ft/s = 37.5 mph Seems about right. In any case, you can check it by timing how long it takes the winch to pull the chute some measured distance.
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