Print Page - 3 rivers spine calculator question…….what string would one select for a BW PSAX?

Title: 3 rivers spine calculator question…….what string would one select for a BW PSAX?
Post by: highpoint on February 02, 2026, 09:53:44 PM

I'm cooking up some arrows using the 3 Rivers calculator and when selecting a string, they have b50 or FF in various configurations. I'm using a BW PSAX 49@28 62". I selected a 14 strand FF as my string and worked up a nice FOC arrow, and it's very close to my heavier BW longbow arrows, only an inch longer. Am I good or should I select a different string?

I don't use a computer at all, just an iPad, so operating system compatibility issues arise with the spine calculators I've used in the past.

Title: Re: 3 rivers spine calculator question…….what string would one select for a BW PSAX?
Post by: Kirkll on February 02, 2026, 10:01:26 PM

Stick with the FF string.

Title: Re: 3 rivers spine calculator question…….what string would one select for a BW PSAX?
Post by: black velvet on February 03, 2026, 08:31:29 AM

Black Widow bows all come with a 14 strand FF string. So you are good to go.

Title: Re: 3 rivers spine calculator question…….what string would one select for a BW PSAX?
Post by: Duker on February 03, 2026, 10:37:15 AM

I agree stick with the FF :archer2:

Title: Re: 3 rivers spine calculator question…….what string would one select for a BW PSAX?
Post by: highpoint on February 03, 2026, 11:38:40 AM

Would you select 14 or 16 strand FF in the calculation?
BW uses 15 strand d97 which is a slight variation in material from FF. I used 14 to be on the conservative side.

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Main Boards => PowWow => Topic started by: highpoint on February 02, 2026, 09:53:44 PM