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Help identify this prop number please,
Hi all,
The number is SSO-515-II-C and it is supposed to be a Michigan Wheel. I tried the Michigan website, no luck. Here is what I do know, I have an OMC 391198 13.75 X 15 aluminum and the engine ran exactly 5000rpm w.o.t. This Michigan stainless prop was in a box marked 13.75 X 15 stainless. When I installed this stainless prop, my w.o.t. went to 6000rpm. That makes no sense at all!! I would say the prop behaves like a 13 pitch or even an 11 pitch. The boat holeshots like a rocket, and although I don't have a speedometer, the boat does seem a tiny bit slower at the original 5000rpm line. This prop is about 10 years old dealer stock. Did someone put the wrong prop in the box?? It really does look very much like 13.75 X 15 from all I can measure. What is going on here? Thanks! |
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Gudmundur wrote:
Hi all, The number is SSO-515-II-C and it is supposed to be a Michigan Wheel. I tried the Michigan website, no luck. Here is what I do know, I have an OMC 391198 13.75 X 15 aluminum and the engine ran exactly 5000rpm w.o.t. This Michigan stainless prop was in a box marked 13.75 X 15 stainless. When I installed this stainless prop, my w.o.t. went to 6000rpm. That makes no sense at all!! I would say the prop behaves like a 13 pitch or even an 11 pitch. The boat holeshots like a rocket, and although I don't have a speedometer, the boat does seem a tiny bit slower at the original 5000rpm line. This prop is about 10 years old dealer stock. Did someone put the wrong prop in the box?? It really does look very much like 13.75 X 15 from all I can measure. What is going on here? Thanks! Describe your boat. I have a 1975 Johnson 50hp w/ a 15" prop that spins 6000, & jumps out of the water on a 15' Feathercraft. I'm thinking perhaps your aluminum prop might be faulty, or has been re-pitched, and/or cupped. Rob |
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In article ,
says... Gudmundur wrote: In article , says... Gudmundur wrote: Hi all, The number is SSO-515-II-C and it is supposed to be a Michigan Wheel. I tried the Michigan website, no luck. The 15" is the right prop for sure, although you mixed your knots & mph, the 15" aluminum should put you closer to 25 knots, or 30 mph WOT & 5000 rpm. I couldn't find any reference to your mystery prop. Maybe use it for water sports etc.? Rob Actually, both terms were correct. At one time I calculated my speed based on a back and forth pass between a pair of buoys located nicely at 6080 feet apart. The new GPS reads in MPH. And I still don't have a dash mounted speedometer. |
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