Measure Rev Rate

Rev Rate requires a video.

Tape from PAP to above fingers. Film a few throws

TAKE NOTE of the Frames Per Second you're recording in. Most video cameras are either NTSC-30FPS or PAL-25FPS, but other rates do exist.

On a frame-by-frame player (Quicktime) count the number of times the tape revolves over 10 frames. Be as exact as possible with this calculation. 1/4 rotation over 10 frames is equivalent to 45 RPM, so a minor mistake in reading the video can be large To minimize error, throw more than one shot, and average your results. The higher the video quality, and the higher the frame rate, the more exact results you can obtain.

A short duration such as 10 frames is best, as this allows you to remove many effects of the lane such as friction.

You will end up with X Revolutions / 10 Frames

At this point, it's simply conversion factors from high school science class:

• I am using 30FPS, as most video cameras in the US will use this *

(x Revs / 10 frames} x (30 Frames / Second) = (revs / Second) (Revs / Second) (60 Seconds / 1 Minute)

Multiply X Revs by 3, (or multiply by 30 and divide by 10) The Multiply your result by 60. It's pretty simple!

For example: If the ball Completes 2 FULL rotations only over 10 frames 2/10 * 30/1 * 60/1 = 360RPM