What prop is this really

belairbrian

Petty Officer 1st Class
Joined
Aug 21, 2009
Messages
360
Part number on prop is 48-73132-10.

One site shows: 15 DEGREE PROGRESSIVE PITCH -- Used on Mercury outboards, 35 HP through 140 HP. Usually have a 3 inch progressive pitch. Stainless steel and aluminum propellers. Doesn't mention diameter.

Is currently on a 1999 40HP Force (pushing 20 ft pontoon). Might be slipping and if so need to replace.
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: What prop is this really

Pitch is expressed in inches. Usually the number at the end is the pitch 10 Might be for a pontoon.
Usually slip is the difference between theoretical speed and actual speed. Expressed in a %.ie.10 % slip.
The prop losing grip is ventilation The prop becomes air fouled.
If the prop is defective with a bad hub its called a spun hub. Ventilation and a spun hub seem the same
but ventilation may happen at at different speeds or triggered by waves,while a spun hub usually happens at roughly the same power range.You can check the hub by putting a water proof line across the hub and doing a test run.Line will be broken if hub is bad..
If a smallish prop probably a new prop is more cost affective.
Pretty sure the 99 Force uses a Merc prop and has a Merc leg.
 
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