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While this doesn't make too much difference in establishing ET track records, it plays the Devil when figuring average scale speeds and distances. The track I'm building averages out to 13.75' per lap, which make it either a 1/5th mile, or a 1/6th mile depending on which yardstick you prefer. I more than likely will go with the 1:64th scale measure mainly because it's more realistic. Take the current track record of 1.382 seconds. If you look at it from 1:87th scale, that's a 520.984 scale MPH average speed, from 1:64th, it's down to 394.73 S.MPH. The EXCEL formula works out like this:

=(((LT*6=MS)5280/MS=FPS.S)FPS.S*3600=FPH.S)FPH.S/5280

Take the lap time (LT) and multiply it by 6, since this is a 1/6th mile track. The answer you get will be the time it takes to travel a mile in seconds (MS).

Take the number of feet in a mile (5280) and divide it by MS.

That will give you the speed in feet per second/scale (FPS.S).

Multiply FPS.S by the number of seconds in an hour, or 3600. That gives you the distance traveled in feet, per hour in real time (FPH.S).

Are you still with me?

Take FPH.S, divide it by the number of feet in a mile (5280) and the answer will give you the average MPH, scale to the track.

...it's so much easier when its all automatically figured with an EXCEL sheet.