FOC Question

[gowest]

I am going to switch from CX Maxima Hunters to A/C/C's - and through some testing with the same arrow length and different broadheads, I have found ~1% FOC difference betwen the Maxima's and A/C/C's.

I have found this to be true (within a certain tolerance) to apply to both fixed and mechanical broadheads. The extra camoflaged wrap on the Maxima's gives support to the claim of a weight forward design.

Now that I am going to make the switch, I am looking forward to the board's recommendations on the best FOC for the following set up:

Mathews Z7 set to 70# with 30" draw

Whisker Biscuit

340 A/C/C cut to 28.5"

2" Blazer vanes

String loop

Any advice or recommendation is appreciated. Thanks.

John

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[Straight Shooter]

Too make up for the difference of 1% will be hard, with the tolerances that close on both of these arrows. The only recommendation I can gve is go with a heavier tip to get the difference back into the range you are wanting. Personally, I have shot both of these shafts and haven't noticed a difference in the accuracy on them.

[Leo]

The A/C/Cs are heavier hence the loss in FOC. If you put a 125gr tip on the Maxima and a 100gr tip on the A/C/C the arrows at that length will weigh almost the same (within a couple grains).

So you then you will have arrows that weigh the same and shoot the same speed. Same kinetic energy and same momentum. The difference is the Maximas will have a higher FOC.

The A/C/Cs are just a hair smaller in diameter than the Maxima's. Shouldn't get much penetration advantage from that difference. The 125gr tipped Maxima's should penetrate a foam target deeper than the 100gr tipped A/C/C's.

I don't think your concern in loosing some FOC is unfounded. FOC is a factor on how well an arrow penetrates. So is having a heavier arrow. Personally, instead of just going to a heavier shaft I prefer to add the weight up front and gain some FOC. Keep in mind you loose effective spine when you do this. Sometimes you have to turn the poundage down a little to tune the bow.

You can tweek your FOC some with brass washers. You can get some here.

Buy Brass Weight Washers - Archery Brass Weight Washers