Estimating arrow speed with 60 lbs. bow based on IBO speed.
#21
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.
#22
Spike
Join Date: Mar 2011
Posts: 2
You can get an estimate from the Archery Calculator, here's a link. Hope it helps!
http://www.backcountrybowhunting.com/articles/calc/
http://www.backcountrybowhunting.com/articles/calc/
#23
Nontypical Buck
Join Date: Feb 2009
Posts: 1,926
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.
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.