??

G

greg crosby

Seaman Apprentice
Joined
Mar 11, 2011
Messages
38
pitch 19 3blade running 4500rpms. Pinch 19 four blade down how many rpms approx.? Looking to buy 4 blade pitch 19" for alpha?
 
jestor68

jestor68

Commander
Joined
Jun 12, 2012
Messages
2,308
Re: ??

A 4 bale prop will usually run 100-200 rpm slower than a 3 blade prop of the same pitch.

This is provided that you are dealing with the same material and brand of prop; or at least different brands of similar design( such as Merc, Solas, Michigan).

What engine do you have?
 
M

MBAKER

Petty Officer 1st Class
Joined
Jun 9, 2008
Messages
275
Re: ??

Definitely keep the brand in mind, I switched from a aluminum Powertech 3 blade 19, to a aluminum Solas 4 blade 19 and lost about 700 rpms.
 
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