KE help for the new guy

eng40sqd · 08-02-2003, 09:45 AM

Well first I would like to say hello from VA to everyone, I have done some looking around the board and liked what I saw alot, seems like a lot of friendly folks on here so I figured I would throw my hat in thr ring as well..

NOw to my first( maybe of many lol ) question. I would like to know the KE of my bow and maybe how you figure that out..

2003 Hoyt Supertech with the spiral cam and 1/2 set up
WB qs rest
29" draw
set right on 70 lbs per the scale
30" Pse carbons @ 349 grains total weight with head
chrono speed of 310 fps

also I see you all talking about different little fine tuning things such as twisting your string, I have not done that how would I do it and how much would it help, any other little fine tunning? I shot for awhile then took a few year break and have been shoting for a couple of years but now I want to get more into the tech side of my bow... I love shoting and would love to be able to tweak little things myself....

thanks for any info.....

Justin

DaveC · 08-02-2003, 09:52 AM

74 ft-lbs KE.
How do I come to that conclusion?
I get lazy and type in the numbers on bowjackson.com' s website.
There is a formula, but as long as I' m sitting in front of a computer I punch the # and wait a milla second or two for the answer.

Arthur P · 08-02-2003, 10:50 AM

Welcome to the forum, eng!

If you' d like to have the formula, it' s arrow speed squared times arrow weight, divided by 450240.

So:

(310^2 X 349)/450240 = 74.49 ft lbs

Like DaveC says though, it' s just as easy to plug in the numbers on Jackson' s site. Probably better than having formulas cluttering up your brain cells.

pdq 5oh · 08-02-2003, 01:28 PM

For a hunting setup you could shoot a heavier arrow & still have good speed, around 270-280. That would give you more momentum, increasing penetration should you hit bone. I' m surprised you didn' t point that out Arthur (the heavier arrow).

Arthur P · 08-02-2003, 02:11 PM

Naaah, I' m taking a rest from that campaign. Experience is the best teacher.

DaveC · 08-03-2003, 05:41 AM

You see there, buy not being lazy and using the actual formula, you picked up a half ft/lb of KE!!!

Shows what lazyness will get ya[:' (].

eng40sqd · 08-03-2003, 10:51 AM

Thanks for the info about KE and the formula to figure it out! I leanr somethign everytime I come on here, I feel like I just picked up a bow for the first time lol !!!