Brace height and weak arrows

[Van/TX]

Mike, this may not be a great example but in the pic you can see how far off to the left the arrow point is to the center line of the bow. If you increase the brace height then the arrow point will come back to the right slightly because the increased distance between the string and the arrow contact point of the riser causes the angle to be less. In effect increasing the center shot of the bow (making it closer to center shot).

I agree that the arrow may leave the bow with a bit less force but the decease of the angle of the arrow leaving the bow IMO outweighs that. It's all very slight at best anyway.

I am with Deb my head hurts.

"I say get your arrows as close to being spined right as possible then bare shaft playing with your brace height until you are happy. It it don't work low move it high and vice versa. "

I agree with you on the above also

[M.E.B.]

Now my head really hurts.

I gotta go and retune all 12 of my bows.

[Van/TX]

Mike, all your recurves are cut past center. Them thangs don't need tuning ;-)...Van

[CRD]

wow im so lost i just hope i can find my way out

[smokin feathers]

Rick,

The shorter the brace height the longer the string thus- longer contact with the arrow on the bow.. faster speeds - weaker spine. Higher brace height means the limbs move forward less - shorter less contact with the arrow on the bow! Slightly slower arrow speed= more spine! Have verified this with a chronograph and the higher the brace (fistmele) the slower the arrow vs. lower brace height.

On my Morrison if my brace height is at 6 3/4" vs. 7 1/4" I get an increase in speed that even my old eyeballs can see.

I got just the opposite today. Morrison shawnee dakota 62" 50@28. carbon limbs with foam cores

Bh at 6 3/4 got 186fps avg of three shots.

BH at 7 1/2 got 192 fps avg of 3 shots

[M.E.B.]

We are all insane or we would be shooting rifles...................

[M.E.B.]

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[M.E.B.]

A conflicting...................

[Mike Javi Cooper]

I don't see it as conflicting.. The Palmer article is saying the same thing we have been saying.. The Instinctive article is talking about speed... not spine..

In my experience bows have a sweet spot and they're not all in the same place.. for instance we played around a couple of weeks ago with one of my students bows.. at 7.5" of brace the bow shot 141fps with a 658 grain arrow.... at 7" it shot 152 with the same arrow... the POI moved from the right of the target center to the middle indicating a change from weak...

Checking draw weight indicated a drop from 49lbs at 28 1/2" to 47lbs at 28 1/2" ....

[M.E.B.]

I just always figured that if a bow is shooting an arrow faster it is putting more force behind the arrow which would in my mind cause it to flex more.........

[Ron]

Too much info for me and I thought I understood these physics

[Mike Javi Cooper]

I just always figured that if a bow is shooting an arrow faster it is putting more force behind the arrow which would in my mind cause it to flex more.........

a longer power stroke doesn't necessarily mean more energy... as you can see by the draw weight readings I posted.. but it can mean more speed if it falls in that sweet spot.. in the above situation going two twists below 7" resulted in a drop in speed as we fell out of the zone..

[M.E.B.]

I always thought a longer power stroke meant more speed.

I guess it does on the draw lenght but not by a lower brace height.

[flywise]

a longer power stroke doesn't necessarily mean more energy... as you can see by the draw weight readings I posted.. but it can mean more speed if it falls in that sweet spot.. in the above situation going two twists below 7" resulted in a drop in speed as we fell out of the zone..

I need to experiment with my set up a little. I might learn a thing or two

[Mike Javi Cooper]

I always thought a longer power stroke meant more speed.

I guess it does on the draw lenght but not by a lower brace height.

Yes it would if it started from the same preload and was drawn longer... but changing the brace on a Trad bow changes the preload....