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Old 06-19-2017, 03:56 PM   #1
Txhuntr2
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Default Another Math Question

I just had my bowstrings replaced and clearly gained some velocity. My old strings were sighted in. New strings shot 8 inches high. How many FPS did I gain with the new strings?

I did not chronograph either string.
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Old 06-19-2017, 03:58 PM   #2
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Knock moved, peep moved, or both. Unless you had a lady estimate the 8" based on what they have been told. No way new strings gain that much speed.


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Old 06-19-2017, 04:01 PM   #3
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You can't correlate point of impact to velocity alone.


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Old 06-19-2017, 04:02 PM   #4
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Odds are your peep is higher
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Old 06-19-2017, 04:08 PM   #5
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I think yall are right, but I was having fun with the math trying to figure it out (as if velocity change was the only variable that changed) and got stuck

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Old 06-19-2017, 04:44 PM   #6
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Quote:
Originally Posted by TexasBob View Post
Knock moved, peep moved, or both. Unless you had a lady estimate the 8" based on what they have been told. No way new strings gain that much speed.


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Close the thread.
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Old 06-19-2017, 04:48 PM   #7
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Quote:
Originally Posted by Txhuntr2 View Post
I just had my bowstrings replaced and clearly gained some velocity. My old strings were sighted in. New strings shot 8 inches high. How many FPS did I gain with the new strings?

I did not chronograph either string.
36
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Old 06-19-2017, 05:08 PM   #8
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36
curt is usually correct.
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Old 06-19-2017, 05:27 PM   #9
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If new string are shorter than the old stretched out strings that would increase the brace height and shorten the power stroke and reduce velocity??????
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Old 06-19-2017, 05:49 PM   #10
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36
Is this based on acceleration by gravity to drop the arrow 8 inches to a target 20 yards away.

I can figure time to drop 8 inches but get stuck after that. Its been a long time since college physics class!
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Old 06-19-2017, 06:01 PM   #11
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No sir. I picked a 3 and then I picked a 6. They were right there on the keyboard.
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Old 06-19-2017, 06:31 PM   #12
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Nocking point on new string is lower than old string or your peep sight is higher. Enough said, anymore thought is a waste of time.
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Old 06-19-2017, 06:40 PM   #13
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Curt is wrong!! It's 32

(For the same reason)
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Old 06-19-2017, 07:09 PM   #14
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Fair enough. Guess I'm the only one who likes thought experiments
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Old 06-19-2017, 07:43 PM   #15
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Quote:
Originally Posted by muzzlebrake View Post
If new string are shorter than the old stretched out strings that would increase the brace height and shorten the power stroke and reduce velocity??????


But with longer string the draw weight would be less since limbs would be more relaxed for lack of a better term thus making it slower


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Old 06-19-2017, 08:27 PM   #16
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Fair enough. Guess I'm the only one who likes thought experiments
Yessir....the rest of us like boobies.
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Old 06-19-2017, 08:36 PM   #17
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Fair enough. Guess I'm the only one who likes thought experiments
I do not know how to calculate that equation. Didn't get that far... lol

Last edited by WCB; 06-19-2017 at 09:31 PM..
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Old 06-19-2017, 09:00 PM   #18
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Yessir....the rest of us like boobies.
If a man only had the capacity to like one thing, boobies isn't a bad choice.

No engineers on here to help me out?
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Old 06-19-2017, 09:05 PM   #19
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Quote:
Originally Posted by Txhuntr2 View Post
If a man only had the capacity to like one thing, boobies isn't a bad choice.

No engineers on here to help me out?
Problem is that I can only like one thing at time and during your "thought experiment" I was distracted by....well....boobies.
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Old 06-19-2017, 09:17 PM   #20
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Quote:
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Problem is that I can only like one thing at time and during your "thought experiment" I was distracted by....well....boobies.
It's like I'm playing poker with my brother's kids or something.
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Old 06-19-2017, 09:41 PM   #21
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Quote:
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It's like I'm playing poker with my brother's kids or something.
Great Tombstone reference.

Now I'm not distracted, so I'm gonna help you. There are simply too many variables for you to ascertain whether or not the new strings gave you increased velocity that led to your arrow striking 8" higher. As stated before, your nock or your peep could have simply not been placed back in the "exact" same place thus causing the errant shot. I've changed strings several times and never realized an increase in velocity....certainly not a noticeable one. So my attempt at humor, (boobies are awesome), was really an attempt to distract you from your "thought experiment" that was gonna leave you with either a headache or the misconception that you'd actually figured something out. You had no idea what you FPS was before so there is no way ANYONE can figure out if you increased in velocity. You stated earlier that you were "having fun with the math" trying to figure it out. My question is "what math"? You're 20 yards away and your arrow is hitting 8" high. What could you possible get from that to determine FPS increase due to new strings. NOW you know why I got distracted by boobies.
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Old 06-19-2017, 10:07 PM   #22
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200+ fps if you started around an average hunting setup speed.

**Not an engineer though
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Old 06-19-2017, 10:24 PM   #23
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Quote:
Originally Posted by Sparkles View Post
But with longer string the draw weight would be less since limbs would be more relaxed for lack of a better term thus making it slower


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If you increase the string length the draw weight increases. If you shorten the cables, the draw weight increases.
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