Targa 37 correct prop size

Can anyone advise me on the correct prop size for my 1999 Fairline Targa 37 fitted with Volvo kad 44's

I have a 1997 T37 with the same engines as you and the builders certificate has the prop details as B5, I believe this is the aluminum duoprop but mine has stainless C type for enhanced performance & durability, I'm assuming they are C5.
 
My stainless props are 3H ( kad42s ) a friend with 44's is 4H so in stainless I would suspect 4H but not sure in standard alloy.
 
I used to have a t37 with kad44 you should have c4 stainless I tried it with b5 ally and couldn't reach wot 3700 to 3900 could only make about 3500
Regds ash
 
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