Weight/Speed
I have turned my bow down from 70# to 60#. It was shooting 292fps. at 70# and now shoots 282fps. at 60#. What would I gain ( approx.) in speed if I dropped from a 385gr. arrow to a 355gr. arrow? ( this is out of a Mathews Legacy) 29.5 draw. My current arrow is a Maxima 350. Was going to go to Maxima 250.
http://www.bucklemke.com/ke/ke.php check out this website,, punch in all your data, ibo speed, arrow weight,, etc.. and it is usually pretty close...
Elite Ninja GTO 70# 28.5 dl 412 grain Victory Arrow 303fps.
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I plugged in the numbers and I'm getting 5fps. faster than it shows with a 385gr. arrow.Originally Posted by tim doll
W/ 308 IBO of the Legacy and specs you listed + 18gr on the string, this site says 291.
Click Here
I used 18gr on the string to reach your reported 282 W/ 385 gr arrow @ 60 and then the 355 gr change bumps the slider to 291.
The beauty of the second amendment is that it will not be needed until they try to take it. - Thomas Jefferson
You will get back approximately what you lost when going down to 60 lbs.
2011 Ninja Elite Pure
2008 Camo Elite XXL
2008 Blue Elite XXL
Victory Arrows & Limbdriver Rest
3 grains usually equals 1 FPS.
yep!!!!!!!!!
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Where did I go wrong when I plugged in the formula? Well anyway thanks for all the info!!!
I don't come up with the right number either. I also don't get to 282 at 60# and 385 grain arrow. I calculate at 271fps.
To get 290 at 60# with 18 grains of string weight, I calculate you need a 310 grain arrow, still above 5 grain limit, but still light.
Am I doing the calculation wrong?
I thought you get back what you lost when going down to 60lbs by dropping 50 grains off a 350 grain arrow down to 300 grain. Wouldn't he have to take more off from 385 than just 30 grains to get close to the same speed?
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