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Estimating arrow speed with 60 lbs. bow based on IBO speed.

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Old 03-21-2011, 09:03 AM
  #21  
Nontypical Buck
 
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Join Date: Feb 2003
Location: Middletown PA United States
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Originally Posted by DaveC
Wolf, I agree. How about a chart with draw weight on one side and arrow weight on another the intersecting line would be the speed as shipped.

Only problem is deciding on a "average" draw length. I vote 29.5"

If you want to talk about average draw length then it's closer to 28" and not 29.5".

Answering the OP's question about whether to shoot a speed bow at 60# or smooth cam at 70#? I've done a few tests of my own on this, although not scientifically. Just using a chrono, and with bows set to my draw length, but both shooting the same arrow. I can't shoot 70# so I'll just tell my experience.

Bow #1--Martin Moab--smooth cam bow set to 27" draw (measured) and 49#.

Bow #2--Martin FireCat--hard cam bow set to 27" draw (measured) and 42#.

Both bows shot a given arrow at the same speed. These are almost identical bows except for the cams. The FireCat shot the same arrow at the same speed although drawing 7# less weight. That difference made that harder cam seem a lot smoother. The arrow weighed 275gr.

I know this doesn't come near the 60# or 70# scenerio, but it should give some approximation of what to expect. Me? I'll take the lower draw weight every time.
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Old 03-21-2011, 01:38 PM
  #22  
Spike
 
Join Date: Mar 2011
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Originally Posted by MidwestArcher
You can get an estimate from the Archery Calculator, here's a link. Hope it helps!

http://www.backcountrybowhunting.com/articles/calc/
thanks i'll give that a try
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Old 03-21-2011, 03:03 PM
  #23  
Nontypical Buck
 
Join Date: Feb 2009
Posts: 1,926
Default Some rules I go by

Every bow is slower than a 30/06. Live with it.

Measure speed by yourself by shooting practice. Get the drop-off of shots every ten yards. Get it for one bow, unless you like getting ten different bows, for your pocketbook.

Practice and get as pin-point accurate as you can. Speed won't help, if you can't hit the broadside of a barn.
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