Interesting wear on prop
Printed From: CorrectCraftFan.com
Category: General Correct Craft Discussion
Forum Name: General Discussion
Forum Discription: Anything Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=47840
Printed Date: March-06-2025 at 7:55pm
Topic: Interesting wear on prop
Posted By: cgerdz
Subject: Interesting wear on prop
Date Posted: July-30-2019 at 12:58am
Haven't seen wear like this before. Acme 422. When does this type of thing become a structural integrity issue?
|
Replies:
Posted By: gt40KS
Date Posted: August-01-2019 at 11:16pm
|
Interesting, and puzzling. It looks like a type of corrosion. ------------- JCCI 1995 Ski Nautique GT40 |
Posted By: Gary S
Date Posted: August-02-2019 at 12:06am
|
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.). ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: KENO
Date Posted: August-02-2019 at 10:21am
| Is it the same on all 4 blades? |
Posted By: cgerdz
Date Posted: August-02-2019 at 2:16pm
| Yes, it is essentially the same on all 4 blades. |
Posted By: KENO
Date Posted: August-02-2019 at 2:35pm
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? |
Posted By: Jonny Quest
Date Posted: August-02-2019 at 3:43pm
|
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. ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: 8122pbrainard
Date Posted: August-02-2019 at 5:10pm
The rash on props isn't uncommon. I've seen it more on older hand worked cast props. Here's one from the past: ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: KENO
Date Posted: August-02-2019 at 6:26pm
| Seems like your picture and his show the issue in two totally different locations Pete |
Posted By: Hollywood
Date Posted: August-02-2019 at 6:31pm
Well, it’s on the blades and symmetrical isn’t it? 
|
Posted By: 8122pbrainard
Date Posted: August-02-2019 at 6:57pm
Yes, it seems you are very observant today. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
KENO wrote:Posted By: KENO
Date Posted: August-02-2019 at 7:45pm
Sharp as a bowling ball Still waiting for some better pictures of your modified prop Pete |
Posted By: KENO
Date Posted: August-02-2019 at 8:05pm
|
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 |
Posted By: 8122pbrainard
Date Posted: August-02-2019 at 8:26pm
Different areas of cavitation corrosion: https://royalsocietypublishing.org/doi/full/10.1098/rsfs.2015.0025" rel="nofollow - Some interesting reading on the subject ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: cgerdz
Date Posted: August-02-2019 at 11:01pm
Looks just like this on all 4 blades
|
Posted By: KENO
Date Posted: August-02-2019 at 11:32pm
Now that's a good picture I'd be talking to Acme |
Posted By: cgerdz
Date Posted: August-03-2019 at 1:26am
|
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. |
Posted By: Hollywood
Date Posted: August-03-2019 at 12:48pm
| Does the trailer have clear plastic crash pads? |
Posted By: cgerdz
Date Posted: August-03-2019 at 11:58pm
| Sure does. |