Different size prop?

pmat1

Petty Officer 1st Class
Joined
Jul 9, 2009
Messages
332
My 1986 thundercraft regency(im pretty damn sure) with a 1986 evinrude 70hp will only go about 25 wide open. this seems a little slow compaired to other boats with 70's. I beleive the prop is a 13 pitch. i do not know much about props. should i get a different size prop? and if so, 3 or 4 blade? im still pretty new to boating:redface:
 
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