Originally Posted by
The Rev
There's no need to broad head tune the bow if the bow is tuned properly. Not all broad heads fly like field points, that's impossible, the design of a broad head is not as aerodynamic as a FP, I know some will argue that, but your free to express your opinion, even though you're wrong.
It doesn't take long to adjust your pins to BH's adjusting and tuning are two complete different animals...
You're missing the underlying principle for broadhead tuning entirely. The POINT of broadhead tuning is NOT to get your BH's to fly to the same POI as your FP's, that's simply a side effect. As you pointed out, the drag of BH's is NOT the same as FP's, so as you increase range, the increased drag of BH's will cause more drop under the arrow than it had with FP's. That's straight forward, simple physics.
Why a shooter SHOULD BH tune, which IS TUNING, not just adjusting, is the simple fact that eccentricity of the BH matters considerably more than it does for FP's. The BH's have a larger superficial (average) diameter, therefore any eccentricity as it spins in the air will have a more dramatic effect. Also, the 'modular' construction of replaceable blade BH's means combined with that increased drag on the blades means you'll see uneven drag on one side versus the other unless you make your best effort to eliminate the eccentric imbalance.
I do agree, however, that a shooter should be ADJUSTING their sight to line up with the slightly different trajectory of BH's rather than FP's, BUT, the science AND practice does support that longer range flight IS effected by improperly installed BH's.