catalina27-talk: prop size

[Ruth Fitzpatrick]

I recently replaced the atomic 4 in my 1987 shoal draft 27 with a yanmar 1 cyl, 
6.5 hp diesel.  So far the fastest I can go under power is 2.5 knots.  There is 
a 2 bladed prop on the boat from the original atomic 4.  Can i change the prop 
to a 3 blade or different pitch will I get more speed?  The engine has a 2:1 
reduction.
       
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