I did some more reading online regarding 4 blade props, and it seems it is recommended that you reduce the pitch by 1 inch or so when switching to a 4 blade from a 3 blade.
With my 17p 3 blade test prop I was turning ~5600 RPMS on a motor that should max out at 4750-5250 (2 stroke merc 115).
For optimal RPMS that prop should be a 19.
So if I get a 4 blade spitfire should I get the 17p? Also the mercury prop selector says I should get a 12.5" diameter 4 blade spitfire.
12.5" seems awfully wee...
Quicksilver Nemesis which is the cheapy version of the 4 blade spitfire comes in a 14x17 and a 14x19.
14 Seems awfully large...
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Zachary
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