Stored Energy, KE and Efficiency??
09-10-2002, 12:14 PM
#1
Nontypical Buck
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Join Date: Feb 2003
Location: Warren PA USA
Posts: 1,512
Stored Energy, KE and Efficiency??
I just read a post about "POWER FACTOR" and was wondering how stored energy is calculated. Anyone know? Then efficiency is calculated by KE/SE? Correct?
Thanks!
Thanks!
09-10-2002, 12:46 PM
#2
Giant Nontypical
Join Date: Feb 2003
Posts: 9,175
RE: Stored Energy, KE and Efficiency??
To find your bow's stored energy (SE) you have to develop your bow's force draw curve. Draw the bow one inch at a time, all the way from brace to wall, and record the weight at each inch. Then you add up all those weights and divide the total (which would be in inch pounds) by 12 to get the stored energy in ft lbs.
Then after you weigh your arrow and shoot through the chrony to get your KE figure, then KE/SE = Efficiency. Multiply that by 100 to get the efficiency percent.
Edited by - Arthur P on 09/10/2002 13:49:01
Then after you weigh your arrow and shoot through the chrony to get your KE figure, then KE/SE = Efficiency. Multiply that by 100 to get the efficiency percent.
Edited by - Arthur P on 09/10/2002 13:49:01
09-10-2002, 12:54 PM
#3
Nontypical Buck
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Join Date: Feb 2003
Location: Warren PA USA
Posts: 1,512
RE: Stored Energy, KE and Efficiency??
Thanks Arthur. I'll give it try and see what I come up with. It's more a want to know thing than anything. I guess I find security in the numbers!<img src=icon_smile_big.gif border=0 align=middle>
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