Thread: Project "Left Overs"

Tweet

Originally Posted by rspears

Jim,
Not to beat a dead horse, but the string [(5280ft/mi x 1hr/60min x 12in/ft) divided by pi] has a numerator of 5280 divided by 60 times 12 which equals 1056, which divided by pi equals 336.13. In the original formula you're entering MPH so the values in the 336 factor get you to a numerator of revolutions and speed in inches per minute with pi being dimensionless. Then when you divide by the denominator tire diameter in inches you're left with RPM.

Thanks, Roger. I was using 60 as a multiplier instead of as a divisor. DUH!! Even at my age I can still learn things occasionally and as long as somebody is learning, we're not beating a dead horse (That's the school teacher coming out in me...).

Don, sorry we hijacked the thread for a few postings, but some old fart (me) had to have help seeing through "the haze".