Originally Posted by Gobuchul
I have a Yam F100 with a standard prop, which is still in good condition.
I am not looking for ultimate performance, tend to cruise at around 4000rpm.
Is there any point in changing to a stainless prop?
Would there be a noticeable change in efficiency?
Will need to determine firstly if current alum prop is an excellent water performer ?
-Need to know which is the min-max wot rpm range factory state for said motor.
-Max wot revs achieved on flat water cond "as loaded" (2)
-Check motor is revving at which side of the min-max wot rpm range.
-Will need a tachometer to dial exact (2) ear sound method is nada bueno!!
There's 2 top running options :
-If motor runs at middle wot range will achieve top end speed increase along slight hole shot decrease.
-If motor runs to max wot range will achieve top hole shot along slight top end speed decrease.
Which of both boating scenarios you'll like best for your particular combo ? this is a very personal choice. For me, max wot rpm as loaded while cruising nicely at 3/4 throttle (4.0-4.5 K RPM)
Don't go to SS props are costly, nothing that a 3 blade alum won't cure if pitched correctly to suit any of both mentioned scenarios.