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Old 15 September 2013, 13:50   #1
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Stainless props

I have a tohatsu 60c hp two stroke

My question is,

Is it worth the extra cash to upgrade a to a stainless steel prop just because it is harder?

Mine is a little chewed but it gets by
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Old 15 September 2013, 15:51   #2
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IMO, no.

Stainless is harder, but if you're already doing damage to an aluminum prop, stainless isn't going to help a whole lot. It is harder (meaning less deforming on impacts), but that impact force gets transferred to the rest of the drive system (expensive to repair); and any damage to the SS prop is a *lot* more expensive to repair compared to aluminum (likely well beyond the cost of replacing an aluminum prop.)

FWIW, when I run in areas where grounding is likely (or a certainty, usually), I pull my SS prop and run aluminum. Works out cheaper in the long run.

jky
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Old 15 September 2013, 16:00   #3
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Good advice above !! Swopped my ally prop for a stainless this year for the slightly better performance until I hit a rock....
Now got a driveshaft with twisted splines on my 15hp two stroke and a bill for 300.
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Old 15 September 2013, 16:02   #4
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I've gone the other way, took off the SS prop and put an aluminium one on. I don't tend to hit things but if I do I'd rather knacker the prop and not the gearbox.
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Old 15 September 2013, 16:25   #5
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Sorry to hijack.....


How important is condition? Mine is also a 'bit' chewed, nothing major, in fact small 'dinks' on a couple of the blades.

Spending 100+ on a sparkly new one isn't going to give me 10% top end is it?
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Old 15 September 2013, 16:34   #6
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Any dents will cause vibration and a loss of thrust. A stainless prop is great if you go over 50 knots but otherwise can be a liability to your gearbox if you ding it off the seabed.
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Old 15 September 2013, 16:37   #7
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Tempting, but no.

I have the same engine and considered getting a Solas stainless steel prop last year. Currently run a 15", but reckon I could get a few extra knots with a 17" propeller.

I clipped a rock (still can't work out how I did it), but these things happen even when you know the coastline. Cost me 60 to get it rebuilt at Steel Developments. Better that than a broken prop-shaft though. Save your money, or consider upgrading to another aluminium propeller. Should top out at around 5,850 rpm at wide open throttle.
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Old 15 September 2013, 17:58   #8
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Quote:
Originally Posted by spartacus View Post
Tempting, but no.

I have the same engine and considered getting a Solas stainless steel prop last year. Currently run a 15", but reckon I could get a few extra knots with a 17" propeller.

I clipped a rock (still can't work out how I did it), but these things happen even when you know the coastline. Cost me 60 to get it rebuilt at Steel Developments. Better that than a broken prop-shaft though. Save your money, or consider upgrading to another aluminium propeller. Should top out at around 5,850 rpm at wide open throttle.
I think I will take the advise of keeping with Ali as I am always beaching, I wonder if increasing from my 13.75 x. 15" to a 17" will drop the pulling power
From standstill to tug out a skier?
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Old 15 September 2013, 21:27   #9
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I've always had luck with filing off any dings, and hammering back any slight bends (big bends will snap when bent back; either get it professionally repaired or replace.) Never noticed any loss of performance in any realistic sense (I'm in a "rare to run WOT for any length of time" kind of area.)

On the current boat, the aluminum prop's I've bought don't perform as well as my SS, so a slight loss of performance from reworking wouldn't make a noticeable difference in any case.

jky
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