I guess I should have paid more attention in school back than. I have DD with jett 50 turning a 8.75 X 8.75. Timed a course of approx 1 mile in 22 seconds. My best calculation is about 140mph that sound about right.

Nick

If your time and distance is correct you were traveling an average of 163.63 mph over your course. My Dust with a Jett 50 had a best time of one half mile in 10 seconds (straight line) for 180 mph. I used a video flying over a two marks and other methods. There is some room for error because of parallax and other things as your speed and mine seem a little high but who knows for sure.

If you divide your mile, 5280' by 22 sec, you get a distance per sec and an easy way to calculate speed.

Well, I came out to 163mph if that'll make yo feel better

5280 div by 22 sec = 240ft per sec

240 x 60 x 60 =864000

864000 div by 5280 =163mph
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Typical run way something like this

700ft div 5 sec = 140ft per sec
140x60x60 =504000
504000 div by 5280 = 95mph