Revfire2 stats
- Thread starter sbpitcher19
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what's the difference between RPS and rotations? seems like the same thing, eh.
- Sep 28, 2015
- 150
- 18
Rotations= Actual measured rotations on the throw.
RPS= actual rotation from above/ actual time in seconds= rotations per second
Example: 11 rotations on a throw that took .6 seconds. 11/.6= 18.33 rps
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I see, said the blind carpenter as he picked up his hammer and saw. thank you!
- Mar 4, 2016
- 66
- 6
We got our RevFire 2 last week and went to an indoor facility to test it out. The numbers were all over the place. It did register most throws, but still missed a few here and there. The spin rates was all over the place. I had DD just throw a regular fastball several times from the same distance every pitch and she either throws with different spins every pitch or this thing is possessed. The numbers weren't even close. We were getting everything from 4.3rps to 19.6 rps. To my naked eye the pitches looked fairly identical. We tried the drop ball, drop curve, and riseball. Every pitch was drastically different according to the revfire2. It's been sitting in the pitching bag since that night. We are going to break it out again tonight and retest. If you guys can think of anything different we can try or test, please let me know.
I opened the revfire and spun it in the air a couple times and I seen some numbers appear on the app. Then I measured exactly 46 ft (43 for the pitching distance) then measure off another 3 Ft behind the plate. I made sure to catch the ball right over the 46' marker. The speeds seem to be pretty close to what she normally throws (51-54mph) so I believe we were at the correct distance.
I opened the revfire and spun it in the air a couple times and I seen some numbers appear on the app. Then I measured exactly 46 ft (43 for the pitching distance) then measure off another 3 Ft behind the plate. I made sure to catch the ball right over the 46' marker. The speeds seem to be pretty close to what she normally throws (51-54mph) so I believe we were at the correct distance.
One of my 2 brand new balls won't read... worked fine for about 4 lessons, then last night it acts like its dead!?!?! 
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- Dec 5, 2015
- 7
- 3
Hey Coach James,
Sorry to hear that! In your app please go to Settings > Clear List and Ignored Balls. Then select "Clear List". If that doesn't work, please contact us at info@revfire.com.
Thank you,
RevFire Team
Sorry to hear that! In your app please go to Settings > Clear List and Ignored Balls. Then select "Clear List". If that doesn't work, please contact us at info@revfire.com.
Thank you,
RevFire Team
- Dec 5, 2015
- 7
- 3
Some RevFire 2 Design Stats...
The RevFire 2 speed measurement is designed to match a high-powered Stalker radar gun set to Peak Detect Mode (release speed). Thousands of measurements were made to map the time-of-flight measured by the RevFire ball to the Stalker reading for the same pitch. The time-of-flight to peak release speed mapping is accurate (within about 1 MPH) provided that the ball is caught at the correct distance. For correct distance, the catcher should plant his/her feet 3’ behind home plate. Check the distance from rubber to pointed tip of home plate. It should be exactly 43’ if the app is set to the 43’ setting. Sometimes these distances or the app setting is off. Also, if the ball is caught 1 foot closer to the pitcher than normal, the speed will be about 1 MPH faster. If ball is caught 1 foot further from pitcher, the speed will be about 1 MPH slower.
There is another factor that can affect the RevFire 2 speed determination – the stride length of the pitcher. For instance, two pitchers can measure consistently at 55 MPH using a Stalker radar gun; however, using RevFire one pitcher is consistently at 57 MPH and the other at 53 MPH. The coach should know that the pitcher that reads higher on the RevFire is releasing closer to the plate than average, while the one that reads less than 55 is releasing further from the plate than average. This difference may be due to stature, mechanics, or both. This is information not available from a radar gun but is important since a key metric is the time that a batter has to react to a pitch. By measuring the time-of-flight the RevFire provides the apparent speed to the batter - reaction time is what matters.
Be aware that some lower powered radar guns may pick up the speed at varying points along the flight of the ball. A 60 MPH release can be read as 54 MPH if picked up at plate crossing.
The RevFire 2 spin measurement is accurate to within 0.35 RPS. There are several internal checks made for spin calculation and if the spin cannot be accurately calculated with high confidence due to weak or inconsistent signals it will display “0 RPS”. “0 RPS” may also display for good knuckleballs. RevFire balls should not be used in a pitching machine. Pitching machine spin rates and electric motor magnetic fields can exceed RevFire ball capabilities.
The RevFire 2 speed measurement is designed to match a high-powered Stalker radar gun set to Peak Detect Mode (release speed). Thousands of measurements were made to map the time-of-flight measured by the RevFire ball to the Stalker reading for the same pitch. The time-of-flight to peak release speed mapping is accurate (within about 1 MPH) provided that the ball is caught at the correct distance. For correct distance, the catcher should plant his/her feet 3’ behind home plate. Check the distance from rubber to pointed tip of home plate. It should be exactly 43’ if the app is set to the 43’ setting. Sometimes these distances or the app setting is off. Also, if the ball is caught 1 foot closer to the pitcher than normal, the speed will be about 1 MPH faster. If ball is caught 1 foot further from pitcher, the speed will be about 1 MPH slower.
There is another factor that can affect the RevFire 2 speed determination – the stride length of the pitcher. For instance, two pitchers can measure consistently at 55 MPH using a Stalker radar gun; however, using RevFire one pitcher is consistently at 57 MPH and the other at 53 MPH. The coach should know that the pitcher that reads higher on the RevFire is releasing closer to the plate than average, while the one that reads less than 55 is releasing further from the plate than average. This difference may be due to stature, mechanics, or both. This is information not available from a radar gun but is important since a key metric is the time that a batter has to react to a pitch. By measuring the time-of-flight the RevFire provides the apparent speed to the batter - reaction time is what matters.
Be aware that some lower powered radar guns may pick up the speed at varying points along the flight of the ball. A 60 MPH release can be read as 54 MPH if picked up at plate crossing.
The RevFire 2 spin measurement is accurate to within 0.35 RPS. There are several internal checks made for spin calculation and if the spin cannot be accurately calculated with high confidence due to weak or inconsistent signals it will display “0 RPS”. “0 RPS” may also display for good knuckleballs. RevFire balls should not be used in a pitching machine. Pitching machine spin rates and electric motor magnetic fields can exceed RevFire ball capabilities.
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I’ve been using the RevFire 2 for a week and a half now. The spin rates compare to the original rev fire and the speed seems to be the same as when her pitch has been clocked with radar recently. All the numbers seem legit and match up to where we are “at.” I like the Rev fire 2, it performs really well. Pitching coach has one and likes it too. No whacky spin rates here.
