"prop savers"
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Category: General Correct Craft Discussion
Forum Name: General Discussion
Forum Discription: Anything Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=5658
Printed Date: November-30-2024 at 7:42am
Topic: "prop savers"
Posted By: 8122pbrainard
Subject: "prop savers"
Date Posted: February-03-2007 at 10:02am
Hey Eric, I'm interested in your opinion of the urethane prop savers that go between the shaft coupling halves. I ended up installing one on my X55 because when I put on a new bottom I also made a new shaft. I must have measured wrong and ended up with a shaft length with only about 1/16" between the strut and prop. It was easier to install the prop saver than setting up the lathe again to turn the taper on a new shaft!! I must say that after the install, alot of the vibration noise was eliminated.
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/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique
64 X55 Dunphy
Keep it original, Pete
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Replies:
Posted By: eric lavine
Date Posted: February-03-2007 at 12:05pm
F-nooooooo!!!!!!!!!!!!!1 unless you have to, make a spacer out of aluminum. if they were meant to be every boat would have one.
see if you can buy a split type coupling from walters machine to allow for the spacing, its spilt and has 2 bolts and allows you with the key to clamp it on to the shaft
201-656-5654
I consider them band-aids, with a properly algned boat you wont get the vibes
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"the things you own will start to own you"
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Posted By: 8122pbrainard
Date Posted: February-03-2007 at 5:14pm
Eric, Thanks for the input. It is properly aligned and I do check it every year which on a wood boat is very important. When I put on the new bottom, it also required a new innner and outer keel that had to be bored. With the strut bolted on and aligned fore to aft I used a long drill bit extension with a nylon bushing that fit the strut (cutla$$ bearing removed) to bore the hole through the keel. Then with a new cutla$$ and the shaft into the boat (no stuffing box yet) and using a dial indicator to make sure the shaft was centered in the cutla$$ I clamped off the shaft. The engine was then centered and aligned from that point with the usual feeler gauge method. When I mentioned vibration I meant the usual noise you get when turning or rapid deceleration. Thanks again, Pete
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54 Atom
/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique
64 X55 Dunphy
Keep it original, Pete
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Posted By: eric lavine
Date Posted: February-06-2007 at 11:27am
Pete, if you put a prop saver in line and the vibration goes away, what does that tell you?
the vibration is still there and its isolated now, it really didnt go away... thats why i call them Band-aids
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"the things you own will start to own you"
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Posted By: 8122pbrainard
Date Posted: February-07-2007 at 6:30am
Eric, I have never been in a boat where the harmonics don't change at different RPM's, when turning, decelerating or accelerating. Yes, the vibration is only isolated with the prop saver but there also nothing wrong. The shaft can be straight, the cutla$$ bearing new, the engine aligned and have a CNC machined prop on it and you will still get harmonic vibrations. We can't even communicate without producing harmonic vibration!!
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54 Atom
/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique
64 X55 Dunphy
Keep it original, Pete
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Posted By: eric lavine
Date Posted: February-07-2007 at 7:44am
I spoke before i thought, your right under power you may get some deflection which also has a tendency to cause vibrations, the bad thing about computers is you cant see the look on someones face or tell emotions, i didnt mean that (what does that tell you) with sarcasm
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"the things you own will start to own you"
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Posted By: 8122pbrainard
Date Posted: February-07-2007 at 11:36am
Hey Eric, I'm ok and there's no problem!! For awile though I thought I was going to have to hook up a transducer to the hull, then record my findings ,then install a new shaft removing the prop saver, then take the readings again to get my point accross!!!
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/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
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Posted By: 87BFN owner
Date Posted: February-08-2007 at 10:42pm
that would have been cool, to see. Sorry not helping any. But that is the great think about a site with so many great minds.
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