Prop size

B

bluediamond46

Seaman Apprentice
Joined
Jul 18, 2006
Messages
45
I have a 50 hp evinrude outboard, the prop says it is a 21,, what does this mean and is it a power prop or speed prop. what would be the best prop for this motor pushing a ranger 14'4" bass boat?
 
W

walleyehed

Admiral
Joined
Jun 29, 2003
Messages
6,767
Re: Prop size

21 would be pitch...and a speed prop for that size engine.
The best prop would be the one that will run around 5700RPM at WOT with a normal load.
Do you have a tach? if so, what do you get with the 21P?
 
B

bluediamond46

Seaman Apprentice
Joined
Jul 18, 2006
Messages
45
Re: Prop size

walleyehed said:
21 would be pitch...and a speed prop for that size engine.
The best prop would be the one that will run around 5700RPM at WOT with a normal load.
Do you have a tach? if so, what do you get with the 21P?
Click to expand...

I run around 5500-5800 with the 21, and about 30 knots.
 
B

bluediamond46

Seaman Apprentice
Joined
Jul 18, 2006
Messages
45
Re: Prop size

walleyehed said:
Did you notice much change in RPM or speed?
Click to expand...
, very little
change in either one maybe 200/300 rpm. no change in speed but better performance then the old prop.
 
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