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Old 10 February 2013, 14:08   #101
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Manual says revs should be between 5600 to 6200.

Here is the prop list:

http://www.suzukimarine.com/~/media/...llers_PDF.ashx
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Old 10 February 2013, 14:13   #102
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Quote:
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I'm using a suzuki 3 x 14 x 21 Alli normally revs to 6k but tried trimming out at wot a bit more than usual as it was flat calm, went up to 44 knots and 6.4k

Thinking about a 3 x 14 x 22 Stainless Steel.

AJ's running a 4 blade SS....
While AJ won't like it..I think whispers 3 blade gives him the revs/speed over AJ.

AJ had the edge on pick up at you'd expect from a 4 blade prop.

I'm not sure it would be healthy to run the engine at whispers revs for to many seasons...

AJ of course has more dials and blue tubes which makes up for it.....I'm 100% on the fence.. ;-)
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Old 10 February 2013, 14:17   #103
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While AJ won't like it..I think whispers 3 blade gives him the revs/speed over AJ.
Say no more
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Old 10 February 2013, 14:17   #104
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Quote:
Originally Posted by whisper View Post
I'm using a suzuki 3 x 14 x 21 Alli normally revs to 6k but tried trimming out at wot a bit more than usual as it was flat calm, went up to 44 knots and 6.4k

Thinking about a 3 x 14 x 22 Stainless Steel.

AJ's running a 4 blade SS....
Yep thought about changing to a four as they are better balanced. Your change will be interesting have to keep as informed as to the changes>
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Old 10 February 2013, 14:22   #105
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I know that 1" pitch makes around 150 - 200 RPM difference but what changes in RPM will I see if I move from Aluminium to Stainless Steel.
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Old 10 February 2013, 14:25   #106
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I know that 1" pitch makes around 150 - 200 RPM difference but what changes in RPM will I see if I move from Aluminium to Stainless Steel.
Should rev higher for same pitch..hence the up in pitch ... ;-)
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Old 10 February 2013, 14:29   #107
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Should rev higher for same pitch..hence the up in pitch ... ;-)
3 x 14 x 24 SS then?
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Old 10 February 2013, 14:37   #108
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3 x 14 x 24 SS then?
My feeling (which counts for nothing)...is 24 would be to high....maybe 22 or 23....
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Old 10 February 2013, 14:44   #109
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The most efficient prop is a single blade but obviously no balance, the less you interrupt the water the better it will work, there is cupping, feathering and polishing which will all help to tune the prop, highly polished props cause less cavitation because there are smooth cupping will make them grip better, feathering causes less cavitation as the edges are sharper
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Old 10 February 2013, 14:50   #110
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Thanks Biff, any idea of a make I should look into?
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