Shorter draw, slower arrows????
Question:
Is there a rule of thumb about how many FPS you’ll lose by shortening draw length by one inch? If it makes a difference, I’m shooting a hard solo cam at 60 lbs, currently at 30" draw. 29.5 inches feels more comfortable when it’s cold and the heavy clothes are on, and I’m gonna try 29" later. Thanks! Lynn
Response:
> Is there a rule of thumb about how many FPS you’ll lose by shortening > draw length by one inch? > If it makes a difference, I’m shooting a hard solo cam at 60 lbs, > currently at 30" draw. 29.5 inches feels more comfortable when it’s > cold and the heavy clothes are on, and I’m gonna try 29" later. > Thanks! > Lynn
On average 1" is worth about 5fps
Response:
Is that based of compound or recurve? Let’s say someone shoots the same compound bow exactly, one has a 30 inch draw one has 29 inch draw, arrows are the same length though (say they use an overdraw) though. Let’s say they both pull 70 lbs. Who has the faster bow? Han Su Kim
Response:
> > Is there a rule of thumb about how many FPS you’ll lose by shortening > draw length by one inch? > On average 1" is worth about 5fps
As long as you shoot the same arrow. But you could (a) shorten your arrows by 1" (b) use a thinner (lighter) shaft (preceding box in the Easton tables). One would have to balance the loss of speed from shorter draw length against the gain from using lighter arrows. Sorry, I do not have details. Best regards - H.Oe.
Response:
Interesting question. With a compound with cams the 30" will clearly be faster. Assuming the same bow with different draw length cams (not just short stringing it) the difference in force draw curves is at peak draw weight. The curves are flat at the peak weight, the brace height is the same, the holding weight is the same and the rate of increase or decrease from peak weight is the same. In other words the longer bow stores one more inch at 70 lbs., or 70 inch pounds or about 5.8 more ft. lbs of energy. That’s probably more than 5% more energy. It is also likely to be more efficient at delivering it. With a recurve, the bows can’t be the same to draw 2 different lengths at the same weight. However if the draw weight of the recurve could be adjusted one could have the same bow with the same brace height that draw 70 lbs at both 29" and 30". Again the 30" will store more energy but only about half the compound value as the longer draw will store a little more energy all through the curve. Again it seems to me the 30" will also be more efficient, as it has more time to deliver its energy. Bill > Is that based of compound or recurve? > Let’s say someone shoots the same compound bow exactly, one has a 30 inch > draw one has 29 inch draw, arrows are the same length though (say they use > an overdraw) though. Let’s say they both pull 70 lbs. Who has the faster > bow? > Han Su Kim
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