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Old 07 February 2006, 09:13   #1
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Country: Greece
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prop (again)

Hello everyone

Id like advise on a prop for a yamaha 90 2s on a 5m rib.

The curent (yamaha) 17 aluminum one goes up to 5.500-5600 with three people, three bags and 150 litters of fuel.

With 5 people 150 litters of fuel and about 120kg of bags went up to 5.300.


I like the numbers and think Ill stay in 17 (better handling when its rough) but I damaged it and though I had it repaired I lost 2-3 knots in the whole range. The rpm stayed the same.

So its time to replace........and Im confused.

Are solas alcup 3 better or worst than genuine?

Shoul I go for an SS one? Should it be cupped?

Any experience from the same engine

Thank you all in advance
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Old 07 February 2006, 14:16   #2
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Stick with your 17" Yammy one. If you travel light ie: by ones self then you could use a 19" Yammy one.
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Old 21 February 2006, 05:24   #3
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Good morning. I replaced the damaged prop with a new 17 (like the one it had), and the rpm droped at 5.200-5.300 from 5.600 it was..........I quess it was seriously damged....!!!

May i ask another thing according to mounting height?

How high should the engine be considering that that the deadrise is very deep (26 degr)?

Should the cavitation plate be aligned at the bottom or higher?
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Old 21 February 2006, 07:54   #4
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Start level with the bottom and work your way up to suit your package. You can come further up if you use SS but there will come a point where you lose grip round corners.
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