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RPM to MPH

  1. Oct 27, 2016 #1
    I need to figure out a gearbox ratio to get a 12 inch wheel to travel at 2mph. If I remember right the equation should be 1foot * 3.14*gearbox output rpm*60 then all divided by 5280 to get the final mph. Am I on the right path? Then I need a gearbox output around 58rpm.

    Thanks to all of you who reply.
     
  2. jcsd
  3. Oct 27, 2016 #2

    Bystander

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    You're close to the "right path." Just one little adjustment.
     
  4. Oct 28, 2016 #3

    Baluncore

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    Do it backwards.
    12” diam = 1 ft wheel, at 2mph.
    wheel circumference = Pi * diam = Pi feet.
    2 mph = 2 * 5280 feet per hour = 10560 ft per hour
    revs per hour = 10560 / Pi = 3361.35
    revs per min = 10560 / ( 60 * Pi ) = 56.02 RPM
     
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