Author Topic: Request for those who are starting a new bow.  (Read 3869 times)

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Offline Badger

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Re: Request for those who are starting a new bow.
« Reply #30 on: April 26, 2018, 10:41:06 am »
     . I personally don't feel there is a good way to even the playing field by using a set formula to adjust weight. Lots of variables that doesn't allow for.

There can be a difference between a formula of "what is supposed to be", and a formula derived from actual shooting stats.

  Different styles of bows will have different types of fdc's. I doubt a perfect formula for this really exists.

Offline sleek

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Re: Request for those who are starting a new bow.
« Reply #31 on: April 26, 2018, 11:13:36 am »
     . I personally don't feel there is a good way to even the playing field by using a set formula to adjust weight. Lots of variables that doesn't allow for.

There can be a difference between a formula of "what is supposed to be", and a formula derived from actual shooting stats.

  Different styles of bows will have different types of fdc's. I doubt a perfect formula for this really exists.

Equalizing  all bows to eachother is neither possible nor the intention. The intention is to equalize all archers to eachother regardless of draw length and weight. What this formula actually does is make the differences between bows stand out more clearly.

Tread softly and carry a bent stick.

Dont seek your happiness through the approval of others

Offline DC

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Re: Request for those who are starting a new bow.
« Reply #32 on: April 29, 2018, 01:48:59 pm »
OK first test, 68" Service Berry 40#@ 24". The bow had a little deflex section. I traced the profile on some paper. The deflex was messing with my head so I did a heat treat to about 2" of relex and tillered out to 24". The bow was now back to it's original profile minus about a 1/4". Call that set or just the heat treat pulling out, I don't know. Anyway I shot it through the DC Bow Machine Mark 1.5 with a 342 grain arrow(I had to modify one so I hope that's the right weight). I got back to back to back 178's, 3 of them. Now I can go for 28". I haven't done that for a while, it's going to be scary. :D :D
Vancouver Island

Offline sleek

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Re: Request for those who are starting a new bow.
« Reply #33 on: April 29, 2018, 02:12:33 pm »
Tjanks for taking the initiative on this Dc. Looking forward to results.
Tread softly and carry a bent stick.

Dont seek your happiness through the approval of others

Offline DC

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Re: Request for those who are starting a new bow.
« Reply #34 on: April 29, 2018, 03:06:20 pm »
OK I got to 28" took about another 1/2" set. So 40#@ 28" shot 184fps 3 times. Then if I did it right went back and measured the draw weight at 24", it was 33 ish pounds. Ran that through Steve's formula and got 274 grains. Lightest arrow I have is 294 so I used that and got 162fps twice. I just did two because that arrow don't fly worth soup. So 178,184 and a questionable 162. 20 grains diff, maybe in the 170's
There ya go!

Oh, the 40@ 28 was with a 396 grain arrow, closest i could get to 10gpp.
« Last Edit: April 29, 2018, 04:05:54 pm by DC »
Vancouver Island

Offline willie

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Re: Request for those who are starting a new bow.
« Reply #35 on: April 29, 2018, 04:19:22 pm »
so 40@24 before and 33@24 after?  I wonder if a guy can use that to see if his tiller goal was too high or too low?(for 28")

Offline PatM

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Re: Request for those who are starting a new bow.
« Reply #36 on: April 29, 2018, 04:23:16 pm »
   So the formula is off?

 He is  tillering to get to 28",  no?


Offline Badger

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Re: Request for those who are starting a new bow.
« Reply #37 on: April 29, 2018, 04:27:35 pm »
OK I got to 28" took about another 1/2" set. So 40#@ 28" shot 184fps 3 times. Then if I did it right went back and measured the draw weight at 24", it was 33 ish pounds. Ran that through Steve's formula and got 274 grains. Lightest arrow I have is 294 so I used that and got 162fps twice. I just did two because that arrow don't fly worth soup. So 178,184 and a questionable 162. 20 grains diff, maybe in the 170's
There ya go!

Oh, the 40@ 28 was with a 396 grain arrow, closest i could get to 10gpp.

  You missed the most important number the 24" shot before it had been drawn past 24". With that speed I doubt you lost much as you progressed.

Offline DC

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Re: Request for those who are starting a new bow.
« Reply #38 on: April 29, 2018, 04:29:02 pm »
I just checked my scale. I have two scales and if I hook them together and pull to 40# the other says 42#. I was using the one that reads high so if anything the weights are about 2# lower.
Vancouver Island

Offline DC

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Re: Request for those who are starting a new bow.
« Reply #39 on: April 29, 2018, 04:30:42 pm »
OK I got to 28" took about another 1/2" set. So 40#@ 28" shot 184fps 3 times. Then if I did it right went back and measured the draw weight at 24", it was 33 ish pounds. Ran that through Steve's formula and got 274 grains. Lightest arrow I have is 294 so I used that and got 162fps twice. I just did two because that arrow don't fly worth soup. So 178,184 and a questionable 162. 20 grains diff, maybe in the 170's
There ya go!

Oh, the 40@ 28 was with a 396 grain arrow, closest i could get to 10gpp.

  You missed the most important number the 24" shot before it had been drawn past 24". With that speed I doubt you lost much as you progressed.

Go back a couple of posts, it's there. I got 178fps at 40@24
Vancouver Island

Offline DC

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Re: Request for those who are starting a new bow.
« Reply #40 on: April 29, 2018, 04:36:20 pm »
   So the formula is off?

 He is  tillering to get to 28",  no?

If I'm following you. I was tillering as if I was going for 40#@ 28". When I got to 40#@24 I stopped and shot the first batch. Then I continued on to 40#@28".
Vancouver Island

Offline PatM

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Re: Request for those who are starting a new bow.
« Reply #41 on: April 29, 2018, 04:44:32 pm »
Yes. Just confirming.

 I wasn't sure if willie was thinking the weight drop was just due to the increased draw.

 To me a better test would just be to shoot the bow at 24, draw it to 28 and shoot again and then shoot it at 24 again.

   Adjust arow weight appropriately each time.
« Last Edit: April 29, 2018, 04:49:03 pm by PatM »

Offline Badger

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Re: Request for those who are starting a new bow.
« Reply #42 on: April 29, 2018, 04:50:30 pm »
 Ok, I didn't think you had gotten a good shot off the first time around.

Offline DC

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Re: Request for those who are starting a new bow.
« Reply #43 on: April 29, 2018, 04:52:40 pm »
I was quite surprised at the speed at 24".
Vancouver Island

Offline willie

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Re: Request for those who are starting a new bow.
« Reply #44 on: April 29, 2018, 05:01:00 pm »
Yes. Just confirming.

 I wasn't sure if willie was thinking the weight drop was just due to the increased draw.

 To me a better test would just be to shoot the bow at 24, draw it to 28 and shoot again and then shoot it at 24 again.

   Adjust arow weight appropriately each time.

I was thinking the weight drop is about how well you choose your weight goal. Are you proposing the better test would be to to take the bow, 40@24 and just draw it out to 48 or whatever @28, without tillering to make 40@28?