Two Blade vs Three Blade ???

WhalerSailor

Cadet
Joined
Oct 10, 2005
Messages
18
Cheers all,
I have a friend who has just retro fitted his 13' MFG runabout with a 1962 Merc 500. This is one clean Merc 500. Great compression! Looks and runs like new. We fitted it to the boat and took it out last week with the old two blade prop which came on it. The engine ran great all day but would only reach a top speed of 23 MPH and the motor was sounding like it was revved too high. As of now we haven't installed a tach (coming soon). Yesterday he put a three blade Michigan wheel prop on it and could not achieve WOT (nowhere near it) and a top speed of 12 MPH. Both props are 13 pitch. Is there such a thing as setting the dwell or point setting to match a prop (ie. two vs three blade)? I used to have an old VW with no power - cleaned and set the points and she took off! I know these props were sold as standard props for as little as 35 HP and his boat is small and light. Any insight would help immensely. Thanks, Dave
 
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