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Main Boards => PowWow => Topic started by: gordydog on August 28, 2020, 11:52:23 AM

Title: Broadhead balance point
Post by: gordydog on August 28, 2020, 11:52:23 AM

I finally realize after shooting in basement why a 233gr Snuffer will hit target at a different spot than a 233gr Zwickey Delta. The broadheads have different balance points, changing FOC on the same shaft from 24.3% to 23.6%. Resulting in the change in right/left impact. Probably obvious to many of you. I used to assume it was flight characteristics of different broadheads. Maybe why a broadhead and field point of the same weight strike different right/left. The extreme example of a long 200gr Grizzly vs a short fat 200gr field point, would change %FOC even more.

Title: Re: Broadhead balance point
Post by: Etter on August 28, 2020, 12:28:14 PM

I shoot the real long 3 blade vpa.  I have to tune my arrows a bit stiff with a field point to be perfect with the head

Title: Re: Broadhead balance point
Post by: Gordon Jabben on August 28, 2020, 12:40:25 PM

Kind of blows the theory that traditional archery is simple.   :)

Title: Re: Broadhead balance point
Post by: katman on August 28, 2020, 03:22:07 PM

I would think a change in dynamic spine is occurring with the foc change causing the variation of impact.
How much of a difference left/right are you seeing?

Title: Re: Broadhead balance point
Post by: gordydog on August 29, 2020, 05:24:07 AM

Katman,two inches at 17 yards.

Title: Re: Broadhead balance point
Post by: Wheels2 on August 29, 2020, 08:52:47 AM

Might be 2 vs 3 blades. ...
Seems odd that such a small difference would cause such an impact change.  But it could be all in the tune.

Title: Re: Broadhead balance point
Post by: Hot Hap on August 29, 2020, 02:56:33 PM

Don't know much about FOC cause I don't worry about it. But I thought it was measured from BOP to valley of the nock.
Hap