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Old 14 April 2007, 23:53   #1
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Dings in prop?

I have developed a few minor "dings" in my s/s prop from occasionally using it as a depth sounder. Do you think they make much difference to the performance of the boat? (Engine is a 150 Yamaha)

Is it reasonable to just grind them out, or should I send the prop into a "pro" for repair...?
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Old 15 April 2007, 07:47   #2
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I'd get it fixed properly. I got a new 19" pitch for my engine and was up to 39kts with much improvement of the cavitation problems. I proceeded to smack it on something (not the bottom, I think I hit something in the water) and chipped the leading edge and I'm beginning to think that's where my missing 3-4kts is and its definitely made a difference to the cavitation when turning, its much worse than it was when the prop was in perfect condition.

If it was practical to get a prop repaired here I would, but I guess it will have to be another new one

Would never have thought relatively minor leading edge damage would make that much difference but it seems to.
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Old 16 April 2007, 12:10   #3
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I'd be a little leery about grinding them out. You'll change the balance more on a SS prop, as the metal is heavier than aluminum. The differences in blade thinckness at the ground sections probably won't do you much good, either.

A prop reconditioning that doesn't require much welding should be less than $100 or so, as I recall. Not too bad when you consider a brand new SS prop will upwards of about $250.

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Old 20 April 2007, 21:53   #4
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prop dings...

Stoo, I have never much messed with prop dings/bends or damage... always took it to the prop guy. I recently discovered that if you use a block of wood on one side of the blade and a hammer on the other it is surprising how easy small dings are straightened out. Hold the block tightly against the blade and start out gingerly hammering the bent portion of the prop, watch the results. IF it is aluminum, if stainless, take it in.
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Old 20 April 2007, 22:14   #5
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Quote:
Originally Posted by pathalla View Post
Stoo, I have never much messed with prop dings/bends or damage... always took it to the prop guy. I recently discovered that if you use a block of wood on one side of the blade and a hammer on the other it is surprising how easy small dings are straightened out. Hold the block tightly against the blade and start out gingerly hammering the bent portion of the prop, watch the results.
That is a good fix for minor dings. However , I prefer to use a tightly packed sandbag ( or a bag of #7-8 lead shot)with a piece of leather over it. This supports the shape of the blade.
Lots' of small taps with the the ball end of a ball pein hammer and file/sand to finish. Take it slow.
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Old 20 April 2007, 22:44   #6
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That is a good fix for minor dings. However , I prefer to use a tightly packed sandbag ( or a bag of #7-8 lead shot)with a piece of leather over it. This supports the shape of the blade.
Lots' of small taps with the the ball end of a ball pein hammer and file/sand to finish. Take it slow.
Thanks for that Limey, I will try that the next time I ding a prop, shouldn't be too long...
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Old 21 April 2007, 17:50   #7
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Decided to fark the prop... Finally got out on the lake and in for a dive today! Water temp is a baulmy 36 up top and 34 at 100'... Just like Little Cayman give or take 45 degrees or so!

The trusty boat fired up like a charm. We spent a little like with the Coasties in there 733. They were breaking in a new crew, so just out burning tax-payer supplied fuel...

Sorry... no pics today. Lent the camera to a friend...

Have you dug out yet Pat?
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Old 21 April 2007, 20:17   #8
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Quote:
Originally Posted by Stoo View Post
I have developed a few minor "dings" in my s/s prop from occasionally using it as a depth sounder. Do you think they make much difference to the performance of the boat? (Engine is a 150 Yamaha)

Is it reasonable to just grind them out, or should I send the prop into a "pro" for repair...?
I don't think anyone has pointed it out, but thats not a s/s one, so pretty cheap to replace.
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Old 21 April 2007, 20:57   #9
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Originally Posted by simmons0 View Post
I don't think anyone has pointed it out, but thats not a s/s one, so pretty cheap to replace.
Don't know about that, Yamaha also makes black stainless props, can't remember what they coat them with...
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Old 21 April 2007, 20:59   #10
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Actually it is stainless. I have no idea why it's black (mostly)....
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