Quote:
Originally Posted by sp220 
The stainless point is MUCH longer, which means the centre of mass of the arrow is further forward with the stainless point than with the tungsten (giving a difference FOC - as Wendy has found on her nano's too)...
So what you just said is basically incorrect, and in fact the reverse is true.
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What?
How can the center of mass of the longer stainless steel point be further forward than the center of mass of a shorter tungsten point?
When they're installed in the shaft, the tungsten point has less overhang from the shaft end, and less insert length in the shaft.
A tungsten pointed arrow the same nock groove to point length as a stainless steel one will have a more forward FOC or CG point.
Work out your CG or FOC movements from calculating the torque moments from the center of mass of the components. That relates to their location or moment arm.
Even without the extra length shaft to compensate for the longer point, the density is so different that the FOC may still be further forward with a tungsten point.