chrono00
02-04-2012, 04:10 PM
how do you even measure your rev rate?
bowl1820
02-04-2012, 04:34 PM
Check out this one
Talk Bowling - #0018
http://www.youtube.com/watch?v=VK94ZtXJa9A
HunterRunsIt
02-05-2012, 06:48 PM
Probably by watching that video! I don't know mine I just know I dont have alot on my ball.
chrono00
02-05-2012, 11:22 PM
that video was a bit confusing to me lol.
i'd probably guess my rev rate is medium level. I get some decent spin, but I don't usually rip the **** out of it
bowl1820
02-05-2012, 11:52 PM
CALCULATION OF REV RATE
From Brian Pursel: Product Manager, Ebonite
RPMs, or revolutions applied, is the speed of the revolutions. The faster the revs, the greater the turning force is at the breakpoint. To measure RPMs you will need a low flare ball (spare ball is good), a piece of tape (4 to 6 inches long), and a video camera. Place the piece of tape running from the bowlers PAP to above the fingers. Film from behind, with a close up of the hand at the release point. As the ball is being released, stop the tape. Assign the tape a position on a clock (i.e. the piece of tape points to 10:00). In slow motion, click off 10 frames and freeze. Count the amount that the tape rotates as hours, as if it was the hour hand on a clock. Multiply the amount of hours by 15. (For example, the ball started at 10:00. After 10 slow motion frames the tape ended at 5:00, passing 10:00 once). One complete rotation around (10:00 to 10:00) counts as 12 hours. 10:00 to 5:00 (the ending position) equals 7 hours. This is a total of 19 hours of rotation. Multiply the amount of hours (19) by 15. This equals 285 Rpms. The other way to measure revolutions is called hand revs. You will also need the piece of tape and a video camera for this. Repeat the steps for measuring RPMs, however let the ball travel 15 feet down the lane. This is the distance of the fourth arrow. Note the starting position of the tape and count the amount of times the ball has rotated using fractions, not hours. Take the total amount of rotations and multiply by 4. This equals hand revs. For example, the ball started at 9:00 and ended at 3:00, passing past 9:00 three times. This would result in 3 1/2 rotations. 3 1/2 X 4 = 14 hand revs. Why do we not count the total amount of revs the ball rotates all the way down the lane until it hits the pins? Because friction will slow down the ball speed and create additional revolutions. By using the first 15 feet, we are counting the rotations in the presence of lane oil, a very low friction environment. In our Surface Friction Selection Chart, we use hand revs rather than RPMs.
bowl1820
02-06-2012, 12:14 AM
heres away is to guess by ball speed.
Speed RPMs
15 mph 200 rpm
16 mph 250 rpm
17 mph 300 rpm
18 mph 350 rpm
19 mph 400 rpm
20 mph 450 rpm
(this can be off some because it depends on what speed you use. most centers(not all though) show ball speed on the monitor. this speed is ball speed at the pins usually, not off the hand speed. A rule of thumb is to add 3 mph to the monitor speed, because a ball will slow about 3 mph going down the lane. So 15 mph at the pins would be 18 off the hand.)
also heres a calculator
http://www.bowlspot.com/coaching/revsPerMinute