Posted by chadd on September 26, 2008 at 22:31:21 from (4.142.219.139):
In Reply to: F-12 tranmisson posted by mhorn on September 26, 2008 at 11:22:48:
I am not trying to be smart or anything, but how about following it with a car? Car speedos have error, but they should be good enough to tell the difference between 3 and 7mph. If they don't run, jack up one side an inch or so and put a chalk mark on the rim or tire. Put it in 3rd gear and with the coil wire pulled and the fuel shut off, count the number of crankshaft revolutions for that mark to make one revolution. That is your gear ratio. You can check with the ratio in the book, or actually calculate your groundspeed with the following formula: Max Engine RPM divided by gear ratio multiplied by tire outside diameter in inches multiplied by 0.002975 equals max ground speed in mph.
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