What would the difference be.

[TheAirMan]

First off let me say I am not a speed freak. I am just curious. What would you think would be the difference in speed of the same bow set at 50,60, and 70 pounds.

 

[f1maxis]

The speed would be relatively the same with the assumption that you would shoot lighter arrows as the poundage decreased.

Here are some examples ran through my speed calculator:

310 fps IBO rated bow set at 29" draw length:

50 lbs, 5 gpp = 293 fps
60 lbs, 5 gpp = 297 fps
70 lbs, 5 gpp = 300 fps



Now, if you shot the same weight arrow at the different poundages, the results are obviously quite different.

310 fps IBO rated bow set at 29" draw length:

50 lbs, 350 grain arrow = 260 fps
60 lbs, 350 grain arrow = 280 fps
70 lbs, 350 grain arrow = 300 fps

 

[Game Eye]

f1 is correct. Keep in mind also as you go up in draw weight you have to go up in arrow weight as to load up the bow. Also you begin to close the window a bit as you go up in draw weight. In other words on most quality bows you can shoot 5 grains per lb at 50 to 60 lbs, but as you push the threshold up around 70 lb and above you will have problems unless you start to go up to around 6 grains per pound. Because of this phenomonon the heavier draw weights don't really give you much more speed but the difference in penetration can be incredible.

 

[POSSUM HUNTER]

f1 is correct. Keep in mind also as you go up in draw weight you have to go up in arrow weight as to load up the bow. Also you begin to close the window a bit as you go up in draw weight. In other words on most quality bows you can shoot 5 grains per lb at 50 to 60 lbs, but as you push the threshold up around 70 lb and above you will have problems unless you start to go up to around 6 grains per pound. Because of this phenomonon the heavier draw weights don't really give you much more speed but the difference in penetration can be incredible.

CANT SPEAK FOR THEM ALL BUTT BOWTECH WILL WARANTY 5GPP ON ALL BOWS, HIGH COUNTRY I BELEIVE SAYS THEY WILL SUPPORT 3 CHECK THAT BEFORE SHOOTING BECOUSE THAT IS REDICULOUS, AND PSE SAYS THE LIGHTEST IS 420 GRAINS ON MOST BOWS

FWIW