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Interesting wear on prop |
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cgerdz 
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Joined: July-01-2019 Location: IL Status: Offline Points: 23 |
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 Topic: Interesting wear on propPosted: July-30-2019 at 12:58am |
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Haven't seen wear like this before. Acme 422. When does this type of thing become a structural integrity issue?
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gt40KS
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Joined: August-05-2017 Location: Wichita Kansas Status: Offline Points: 946 |
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Posted: August-01-2019 at 11:16pm |
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Interesting, and puzzling. It looks like a type of corrosion.
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JCCI
1995 Ski Nautique GT40 |
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Gary S
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Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Posted: August-02-2019 at 12:06am |
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Google Cavitation-corrosion. It is particular form of erosion caused by the "implosion" of gas bubbles on a metal surface. It is often associated with sudden variations in pressure related to the hydrodynamic parameters of the fluid (e.g. hydraulic turbine blades, propellors, stirrer blades, etc.).
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KENO
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Posted: August-02-2019 at 10:21am |
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Is it the same on all 4 blades?
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cgerdz
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Posted: August-02-2019 at 2:16pm |
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Yes, it is essentially the same on all 4 blades.
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KENO
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Posted: August-02-2019 at 2:35pm |
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I think a better picture would be good showing the pitting/erosion better.......with no shadows right in the affected area
 Then send the same picture and question to Acme and see what they say How many hours of use on the prop? |
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 3009 |
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Posted: August-02-2019 at 3:43pm |
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It looks like cavitation erosion to me. My company's ocean-going vessels have to replace propeller blades on a planned schedule -- due to cavitation erosion.
Erosion due to running in low water / silt conditions looks different....the blades are thinned out and shiny. |
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: August-02-2019 at 5:10pm |
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The rash on props isn't uncommon. I've seen it more on older hand worked cast props. Here's one from the past:
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KENO
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Posted: August-02-2019 at 6:26pm |
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Seems like your picture and his show the issue in two totally different locations Pete
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Hollywood
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Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13521 |
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Posted: August-02-2019 at 6:31pm |
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Well, it’s on the blades and symmetrical isn’t it?
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8122pbrainard
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Posted: August-02-2019 at 6:57pm |
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Yes, it seems you are very observant today. |
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KENO
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Posted: August-02-2019 at 7:45pm |
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Sharp as a bowling ball Still waiting for some better pictures of your modified prop Pete |
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KENO
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Posted: August-02-2019 at 8:05pm |
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Once upon a time a short time ago in a land call the USA, there was a company called Central Valley Propeller. (CVP props for short)
They were pretty popular They turned into a company that no longer exists, because a number of their props came apart right where the blade meets the hub launching a blade right off the prop. They had thin blades, so do Acme props Same area as cgerdz prop which is a little different situation than Pete.s prop picture from a Ski Supreme thread I figure Acme may want to get an upclose and personal look at his prop |
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8122pbrainard
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Posted: August-02-2019 at 8:26pm |
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cgerdz
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Posted: August-02-2019 at 11:01pm |
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Looks just like this on all 4 blades
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KENO
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Posted: August-02-2019 at 11:32pm |
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Now that's a good picture I'd be talking to Acme |
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cgerdz
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Posted: August-03-2019 at 1:26am |
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You're probably right about Acme wanting to take a look. I'll get in touch with them next week.
I have no idea how many hours are on the prop, I'm at least the fourth owner of the boat, and the prop came in a box as a spare. I got it at 452 hours right before the 4th, and we hit 477 today. I'd bet almost anything this is bhectus old boat (unless there is another with an Apex, the exact gel scheme, and N3 guide post covers on it), doesn't look like he's around the forums any more though. |
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Hollywood
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Posted: August-03-2019 at 12:48pm |
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Does the trailer have clear plastic crash pads?
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cgerdz
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Posted: August-03-2019 at 11:58pm |
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Sure does.
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KENO wrote: