Prop Timing

R

ras737

Member
Joined
Apr 28, 2002
RO Number
8373
Messages
30
Does anyone know if the props on a bravo 3 drive need to be installed in a particular position relative to the blades and ventilation plate? A friend of mine is having some performance issues and this is our last resort.
 
The front prop (larger) is mounted so that one blade is at the twelve o'clock position. The rear prop is mounted with one blade at the six o'clock. (Or vice -versa)
 
Has anyone done any tests to determine if this really makes any difference?
 
I didn't think it would mater at all...but on further figgurin' I decided it would make sense to avoid the props to passing each other right at the 12 o'clock position...being closest to the anti-ventilation plate where wash out from the blades could affect water flow and maybe even harmonics.
 
I didn't have any literature to read about it, but the last thread about prop timing got replys stating in was important. My assumption was the prop(s) rotation had to be rotating at the same rpm so the prop blades would pass each other at the same place each revolution.
 
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