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#21
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The spiral that I measured was down all the way until entry into circuit
(there was no gain of height after release) and on all the loops the windspeed was consistent with 13 kts. The speed up the launch was remarkably constant and too low for a safe launch without the headwind mentioned. Larry Bob Korves wrote: "Larry Bogan" wrote in message ... I was interested in the 3600 ft gain on the winch launch flown by Elke in the Ka8 so I analyzed the igc file. As it turns out there was a 13 kt headwind during the launch. (This can be determined by the circling done after the launch). The maximum angle of climb was never over 40 deg (relative to the air) and his airspeed was mostly in the high 40 knots but never getting to 50 knots. The wind could very easily have been calm at the surface and 13 knots at the 1100 meter release altitude. That would be consistent with both the ground observer's report and the logger trace. -Bob |
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