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186 fps

Started by gatorgar, March 02, 2009, 09:22:00 PM

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Orion

Wildman, I didn't say it wasn't possible, just unlikely.  A lot of folks don't use weighted inserts,(We don't know in this case.) and without them and a 125 grain head, most carbons won't make 500 grains.  Only point I was trying to make is that without accurately measuring arrow weight, and bow weight at draw length, and even the accuracy of a chronograph, the results one gets can be meaningless and/or misleading.

Shawn Leonard

Thanks OL I knew you would be close! Shawn
Shawn

SteveB

Speed doesn't matter?

I bet nobody would try 2 bows of equal #'s that shot well for them and say "I'll take the slower one"  :)

Bob L.

O.L how could I figure out my stored energy for my bow? Would that tell me alot about how good/.bad my bow design is?
Thanks
Bob

O.L. Adcock

Bob it's tough to get it accurate with spring scales and a marked arrow. Digital scales off a shooting machine is the best way to go but not doable for most. Being off .2# times the 18 or 20 measurements add up to a lot of error. With care a fellow can get close. Just take a weight measurement every inch back to what ever draw you want. Add those up, that gives you inch/pounds. Divide that by 12 gives you ft/lbs. Divide arrow ft/lb by stored ft/lbs gives you efficiency. Divide the stored ft/lbs by the draw weight gives you SE/PDF (stored energy per poind of draw force)

At 28" we've seen SE/PDF's as low as .838 and as high as .953...That's a 13% difference so assuming equal efficiency there would be that much difference in performance. I picked .9 just for a number in the middle.

At 30" the numbers run from a low of .905 to 1.037, the same 13% split. An interesting point, shorter draws result in less storage but the efficiency doesn't change much and can be higher at 24" then at 28 or 30". Many think efficiency drops at lower draw lengths, it doesn't, just energy storage....O.L.
---Six NAA/FITA National and World flight records.----

pdk25

I shot my RER recurve through a chronograph a couple of days ago.  63# @ 29".  Shooting 700 grain arrows at 168 fps.  My release may not be the cleanest, but my gut feeling is that your numbers are too high.  But then again, maybe my numbers are too low.

Bob Sarrels

I built that bow and I am gonna stay out of this.
Now then, get your weapons ~ your quiver and bow ~ and go out to the open country to hunt some wild game for me.  Gen. 27.3

pdk25

No offense intended toward the bowyer.  I'm sure it is a fine bow, and since I wasn't there I should maybe keep my opinion to myself.

Guru

Alex, Sounds like Bob built you a great bow. Enjoy it brother!   :thumbsup:  

Wish you guys weren't so far away, I'd love to do some shootin' with you and your friends    :campfire:
Curt } >>--->   

"I love you Daddy".......My son Cade while stump shooting  3/19/06

LEWIS VADEN

I have a superstition and I get that kind of speed or better with a 29" draw and 8 strand df97 string.  No accuracy problems either.


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