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V Speeds

Philip Welsch

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Some of us spent some time on this a few years ago, and my impression was that the accurracy of IAS varies from plane to plane. I went out under known temperature and wind conditions and flew large triangular courses, recording the IAS heading, mag. course, temperature and GPS groundspeed on each leg. I found that the average of my Dynon and FD analogue IAS was pretty close to correct, once I got the dam on the static port oriented in the right direction (dam in front, higher IAS). I have been meaning to do this again to see if things have changed. When I get to it I will post the calculations again. WF

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