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Pounds vs. Speed?

 
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Joe2Kool
(286 posts)
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Jul-02-17, 
03:08 PM (MST)
"Pounds vs. Speed?"

Anyone have info on how much impact an increase in draw weight has on typical arrow speed? Assuming from the same bow.

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  Table of Contents  

 Subject   Author   Message Date   ID 
 RE: Pounds vs....  elktaker      Jul-03-17   1 
  RE: Pounds vs....  elktaker      Jul-03-17   2 
 RE: Pounds vs....  Joe2Kool      Jul-07-17   3 
  RE: Pounds vs....  elktaker      Jul-07-17   4 
 RE: Pounds vs....  Joe2Kool      Jul-11-17   5 

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elktaker
(97 posts)
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Jul-03-17, 
07:54 AM (MST)
1. "RE: Pounds vs. Speed?"

If you are looking for your setup, I can punch it in archery advantage. There are way to many variables to give an estimate.

To give you a rough, I would need:

Arrow weight
Bow make/model
Draw length
current lbs and what increase you want to know
(You can use a simple calculator only to estimate velocity as well)

I shoot 499 gr arrows at 61 pounds at 273 fps. If I moved my bow up to 70 it's at 290.

I shoot 61 lb because it's comfortable for repeative shooting and I can hold it for a couple of minutes if I need to. I have more than enough energy with a 500 gr arrow.

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elktaker
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Jul-03-17, 
07:58 AM (MST)
2. "RE: Pounds vs. Speed?"

The faster your setup can push an arrow the more increase you are going to see. It's going to be more like average percentage increase than true # of FPS.

My bow is decently fast (340 IBO) and draw is 31" which is long for most so giving me more speed but my arrows are probably a little heavier than some.

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Joe2Kool
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Jul-07-17, 
08:44 PM (MST)
3. "RE: Pounds vs. Speed?"

LAST EDITED ON Jul-07-17 AT 08:48 PM (MST)

After seeing your reply, I surfed a little more and found archerycalculator.com. I wanted to determine how much better the newer bows were at my shooting specs, or if it was just due to the higher draw weight. For whitetail, I currently shoot an old Champion bow at 60 pounds, resulting in 55 ft-lbs. (250 fps, 400 gr).

When I put my specs (29" draw, 60#) for a 320 IBO bow, speed was 275 fps (25 faster than mine, but 45 lower than rated), for a KE of 67. I just gotta decide if the 20% energy increase is really necessary. For muleys, no. For elk, I'm still thinking.

That 499 gr at 273 fps is pushing 82 ft-lbs! What bow are you shooting?

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elktaker
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Jul-07-17, 
10:12 PM (MST)
4. "RE: Pounds vs. Speed?"

Bows a Quest AMP and I shoot a 31" draw. Set at 61 lb. this is a tall bow and may not be best for whitetail style hunting if u like shorter bows for maneuverability.

Think of IBO rating as how effiecent the bow is. The rating is 5gr/lb. you do not get i higher rating because bows heavier.

Standard is 70 lb, 30" draw and 350 gr arrow for the rating. If you bow only goes to say 60 the rating is just going to be the speed of 5gr/lb. which is the speed for a 300 gr arrow at 60 lb at 30" draw. This is optimal speed and lights arrow suggested for a poundage.

If you get a more efficient bow and have any plans to take a shoot past 40 yards, I would up the arrow weight as well. If you plan to only shoot to 40 or less u can easily get by with a single pin with the added speed (flatter tradjectory)and a 400 gr arrow with some practice holding low or high vitals at different distances which I prefer over having closer pins. My first pin on my setups a 30.

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Joe2Kool
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Jul-11-17, 
08:53 AM (MST)
5. "RE: Pounds vs. Speed?"

Thanks ElkT. I thought IBO was at a fixed 350 gr. I didn't realize it was 5 gr/lb.

That kind of energy at that draw weight is darn efficient for your bow.

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