RE: Estimating arrow speed with 60 lbs. bow based on IBO speed.
Thanks for the response. Sorry I didn't clarify my question. I was talking about using the same 350 gr. arrow weight in the 60 lbs. model.
Is this statement true: You generally loose or gain about 2 fps. for every pound of weight that it decreased or increased?
I wish that archery manufacturers would supply arrow speeds based on the same 350 gr. arrow at 60 lbs. I know that this would be above the 5gr./lbs. limit that is put on IBO, but how many people really shoot there bow at 5gr./lbs.. Any arrow that I've ever looked up on an arrow chart would be way over 5gr./lbs. if it's spined correctly for the poundage. Show me a 350 gr. arrow that will be the correct spine for a 70 lbs. bow at 30 inch length of pull.