Rev Rate check

[bowl1820]

Tape next to my finger holes?

[panbanger]

How do you use this video to calculate your rev rate? Do you count the revolutions then multiply it by something? I've seen before on the web people mention how many revolutions per minute they get on their ball, but I figured they had some computer program at a pro training center tell them this.

Also, are you using a cell phone to video this? I've been looking for a cellphone tripod that I could use to video my bowling but they're pretty hard to find, and pricey once you do find one. I may just lay mine on it's side at ground level, which is what it looks like you may have done here.

[bowl1820]

There are several ways to calculate Rev's this is just one.

Measure Rev Rate

Calculating Rev Rate requires a video.

Place Tape from PAP to above fingers.

Make sure the tape is contrasting in color to the ball. This will allow you to easily see the rotations.

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


Not the best video that frame rate (30FPS) is too slow. And that music is ANNOYING.

[bowl1820]

Talk Bowling Episode 18 How to Calculate Your Bowling Ball Speed and Rev Rate

[billf]

I like the FPS method better than the revs from foul line to pin deck with time ball took to get there method. Changing methods brought my rev rate up to over 400 from 360 lol.
I still need to decrease my revs or increase my speed so they match no matter which method I use to calculate it.

[bowl1820]

Well you could average the two to gather.

[billf]

I will worry more about it being accurate when I can get my speed up consistently. Until then I know I'm rev dominant no matter what the calculations say.

[martin]

hmm i doubt black tape will be visible on my brunswick anaconda? guess i need to get some white tape so i can tell my rev rate..

[panbanger]

Excellent instructions, bowl1820! Thank you so much. It's pretty basic once you get a program that can do frames per second, for some reason that just never occured to me

[bowl1820]

Excellent instructions, bowl1820! Thank you so much. It's pretty basic once you get a program that can do frames per second, for some reason that just never occured to me

I like the simple version best.

Put a tracer tape on the ball from PAP to fingerholes.

Throw the ball down the lane and time how long the ball takes to hit the pins. Example 2.4 seconds.

Then Just play back the video in slo-mo and count the number of revolutions from release to hitting the pins .

Then use this formula: (60/time in seconds) X the # of revolutions = RPM

example:
18 revolutions 2.4 sec.

(60/2.4= 25) X 18 = 450 rpm

or use the Rev Rate Chart and look it up

Find it here:
http://powerhousebowling.com/images/...rate_chart.pdf