A bow at static should have some cam lean. Ideally the cams should be pointed to about 1/4" right of the D-loop for a right handed shooter.
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Originally posted by boweye View PostDrawl length has nothing to do with the equation of arrow spine.
Only poundage, arrow length, and to an extent, cam design.
Yes draw length has a lot to do with spine. This is where the amount of force that is applied to the arrow. My 26.5 draw is not going to apply the same amount of force to an arrow from same bow at 29 inch draw. No matter how long or short the arrow is.
From what I see you wrote, is do to what or how we find spine on a chart. Charts are a rough calculation. Plus charts are set up so if you choose a 26 arrow then your draw is 26 inches. Old school
If you use a program. Draw length makes a big difference.
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Originally posted by boweye View PostA bow at static should have some cam lean. Ideally the cams should be pointed to about 1/4" right of the D-loop for a right handed shooter.
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I respectfully disagree on the importance of drawl length affect on arrow deflection. I believe the initial release of energy has the greatest affect on arrow deflection and the time thereafter has minimal influence.
I think the arrow is much like a race car, the longer on the track, the faster it goes... but the frame of the car is torqued during the initial start. Thus the arrow's deflection is caused by the initial release of stored energy.
You are right that spine programs use the information.
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Originally posted by boweye View PostI respectfully disagree on the importance of drawl length affect on arrow deflection. I believe the initial release of energy has the greatest affect on arrow deflection and the time thereafter has minimal influence.
I think the arrow is much like a race car, the longer on the track, the faster it goes... but the frame of the car is torqued during the initial start. Thus the arrow's deflection is caused by the initial release of stored energy.
You are right that spine programs use the information.
Energy is being applied to the arrow as long as it's on the string. And the arrow is being flexed one direction. As soon as arrow leaves the string it will start to flex in the opposite direction and it starts slowing down.
Same as taking a 28 in arrow. If I shoot it from a 26 in draw bow vs a 29 in bow. The arrow will be dynamically stiff in the 26 in bow.
In the race car. The reason it gets faster is your appling energy to the tires to push it Foward the whole time you give it gas. An arrow has no more energy to push it Foward once it leaves the stringLast edited by enewman; 02-05-2016, 04:07 PM.
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