Sound like a P.I.A. math problem I would have had 30yrs ago.......
Originally Posted by CarlosII
By switching vanes all the other variables change. The 1.5 vane is claimed to be 3.0grs, the 2.25 vane says 5.5 grs.
You've just added 7.5grs to the rear of the arrow, effectively lowering your 10% FOC. To what? I don't know without the arrow/length, but maybe lost 1% or more, and the extra weight has also dropped initial arrow speed maybe 2-3 fps.
But even if you forget all that and assume every else stayed equal, going from 1.5 vane to the 2.25 vane will create more drag. Larger vane may stabilize the arrow better but will slow it faster and drop faster, and that is affected more or less by how much, if any, offset the vanes have to..........bottomline, getting progressively worse the farther it goes, you maybe ended up loosing 5-6fps and arrow hit 2-3" lower way out at 60yds
Other than the lower than I personally like FOC, really not that much practical difference
2009 Martin Bengal M2 Pro Cam w/factory STS & CCS.....66lbs, 29" DL, 422gr @ 272fps, Winners Choice string/cable, Trophy Taker drop-away Rest, Scott Release
1996 Martin Firecat XRG Pro Series w/Ultra Sonic wheels.....69lbs, 29" DL, 465gr @ 245fps, w/fingers & Martin leather glove