Thank you this! This has been a conversation we have not had in the barebow community. The bottom heavy barebow is simply an artifact of the rules, not an ideal weight placement. When I read the classic text on Olympic recurve stabilization, Controlling Bow Behaviour with Stabilizers by Ellison, he said something that was really important to me: the riser is a vertical stabilizer. The further you can move the weight from the center of gravity, the greater the inertia. Having weight at the limb pockets has a much greater effect on both the low frequency vibrations or movement from the archer (muscle tremors and motion) and the high frequency vibration from the bow's shot reaction. And as you pointed out, this is ideal for when you are not shooting in a level field and need to shoot at an angle. I have found the center stabilizer bushing a useful place for weight as it allow the bow center of gravity to be moved forward to help place that center of gravity at the pivot point of the grip. The limb pockets on a deflect riser can't really more the CoG forward because of their placement.
@BorderArcheryLTD
3 ай бұрын
I agree the bow should be vertical. As tiller remains constant through the shot. The tempest is a utter slayer in this. I'll do a video on it tomorrow
@dragoscoco2173
3 ай бұрын
The CoG placement is complex and not really. A bottom heavy barebow is more vertically balanced so it does not tend to fall over, as would be the case if for some reason the Cog was above the grip. The stability obtained is not really much during the shot, as gravity is slow to act in a few miliseconds, but more easily felt during aiming where it does not let the bow tilt (roll) as easily. Then again a too far off (low) from grip CoG will make the bow pitch during the shot. There is some value in adjusting a left to right weight balance that would place the CoG more centered to the grip, while the effect would be small it should have a more consistent sweet spot for a specific grip hold or even help in clearing and permit more spine. The CoG also moves backward during the draw and travels back to the forward position. Setting it up to be forward in the final configuration of the shot means the CoG will at some point be right at the grip pivot point, which is an unstable configuration, but you might not even observe that effect in a point of impact shift as the arrow might have left the string before that. I'd test a variant with a Cog as backwards as possible (closer to the shooter). It shouldn't be that bad, but this is down to shooter preference.
@mozu305
3 ай бұрын
@@dragoscoco2173 The bottom heavy barebow was an artifact of World Archery rules as there was no weight allowed above the grip. The bottom heavy barebow feels very good in the hand because it "balances." But balance is the bow's reaction to gravity. If you are rotating the bow to shoot up or down, having the bow react to the gravity is not ideal--as demonstrated in the video. I think most bottom heavy "barebow" designs are still based on the old ruleset as it seems "natural." The forces of the archer on the grip and string can easily keep the bow oriented vertically. Having additional weight just for balance does not seem to be solving a problem. The CoG in a bottom heavy bow is low. In the video above, that results in an uneven reaction between the top and bottom of the bow. Bringing the CoG to the center of the bow (and the center of my riser is at the pivot point) that evens out the shot reaction. Yes, the CoG does change as the bow is drawn, but it is drawn through the axis from the pivot point to the nocking point (or somewhere near), unlike a bottom heavy bow.
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