Author Topic: Adam Karpowicz - Closing in on the Half Mile  (Read 16232 times)

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Offline avcase

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Re: Adam Karpowicz - Closing in on the Half Mile
« Reply #15 on: February 27, 2018, 01:13:53 pm »
FYI, Adam recently reported chronograph test results with this bow. With a 223.3 grain arrow (same weight as used for his 790m shot), he recorded 404 fps with a Dacron string, and 436 fps with a fast-flite string. The bow stores about 160 ft-lb of energy in the draw, so efficiency is approaching 60% for the fast flight string.  A top notch linen string would fall somewhere between the performance of the Dacron string and fast flite string.  That is really moving for a natural materials bow! 

Even more impressive is that the bow has survived numerous test shots without blowing up.

Alan

Offline Badger

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Re: Adam Karpowicz - Closing in on the Half Mile
« Reply #16 on: February 27, 2018, 02:42:25 pm »
  That is an amazing distance he got with that arrow. That style has always been my worst flyers. Maybe all that extra speed works well with it. I am pretty sure it greatly enhanced the arrows spine. His efficiency for less than 1.5 grains per pound is astounding!

Offline Badger

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Re: Adam Karpowicz - Closing in on the Half Mile
« Reply #17 on: February 27, 2018, 06:12:30 pm »
  How far is he drawing the bow to store 160# energy??

Offline avcase

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Re: Adam Karpowicz - Closing in on the Half Mile
« Reply #18 on: February 27, 2018, 07:58:04 pm »
It is 27.5” draw at 175# draw weight. That’s a lot of energy!

Alan
« Last Edit: February 27, 2018, 08:04:23 pm by avcase »

Offline PatM

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Re: Adam Karpowicz - Closing in on the Half Mile
« Reply #19 on: February 27, 2018, 08:32:12 pm »
Has the weight climbed 50 pounds?

Offline Selfbowman

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Re: Adam Karpowicz - Closing in on the Half Mile
« Reply #20 on: February 27, 2018, 09:24:24 pm »
Wow!! Arvin
Well I'll say!!  Osage is king!!

Offline pnwarcher

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Re: Adam Karpowicz - Closing in on the Half Mile
« Reply #21 on: March 01, 2018, 01:42:02 pm »
That is amazing!
Newbie question: Why are the bow's nocks so squared-off? Those edges look like they'd be really hard on the string. Is it because the tip is super narrow, or is it somehow more efficient this way? They just look kind of... crude