Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 31-10-2007, 17:07   #16
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,830
I've realigned the engine, checked the shaft for trueness etc., but I still have vibration. That's a subject for a different thread...


Steve B.
__________________

__________________
senormechanico is offline   Reply With Quote
Old 31-10-2007, 17:31   #17
Moderator Emeritus
 
Ex-Calif's Avatar

Cruisers Forum Supporter

Join Date: May 2007
Location: Singapore
Boat: Maxi 77 - Relax Lah!
Posts: 11,514
Images: 4
How about trimming the end of the housing that is attached to the skeg? I don't know how much meat is there but that could be a more permanent fix.

Or looking at it maybe a bit from the prop and a bit from the housing. The prop hub looks pretty robust.
__________________

__________________
Relax Lah! is For Sale <--- Click
Click--> Custom CF Google Search or CF Rules
You're gonna need a bigger boat... - Martin Brody
Ex-Calif is offline   Reply With Quote
Old 31-10-2007, 17:46   #18
Registered User

Join Date: Mar 2006
Location: Buena Vista Colorado
Boat: S/V Pooka Com-Pac 27
Posts: 212
Here is the protype cut from an old zinc. I was checking to see if there is enough material left after fitting to support the nut/bolt without coming apart. The next one will be turned on a lathe.

__________________
S/V Pooka
Com-Pac 27
bmiller is offline   Reply With Quote
Old 31-10-2007, 18:21   #19
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,830
The thrust from the prop will push the shaft forward against the motor mounts. This will wear away a bunch of the zinc against the cutless bearing. It will wear according to the throttle setting. More throttle= more thrust= more wear.

Whether the zinc or the cutless will wear the most is the question.
Either result is not good.

Steve B.
__________________
senormechanico is offline   Reply With Quote
Old 31-10-2007, 18:40   #20
Registered User

Join Date: Apr 2006
Posts: 4,413
I have a similar installation and I have the donut ground down about an 1/8" and this allows for the prop pulling forward. Here you can see it before the zinc is installed.

I suppose the test is how much zinc is left when you haul out. For me the boat is in the water at least 11 months, 4 of it in a marina, 7 on a mooring and I always have some zinc left. I am assuming that IT is taking the "hit" and not sharing it with the other metals. Am I safe in that assumption?

jef
sv shiva
Attached Thumbnails
Click image for larger version

Name:	Prop.jpg
Views:	107
Size:	73.3 KB
ID:	2020  
__________________
Sandero is offline   Reply With Quote
Old 31-10-2007, 20:48   #21
Senior Cruiser
 
Alan Wheeler's Avatar

Cruisers Forum Supporter

Join Date: Dec 2003
Location: Marlborough Sounds. New Zealand
Boat: Hartley Tahitian 45ft. Leisure Lady
Posts: 8,038
Images: 102
bmiller, with all due respect, mate thats ugly ;-) It must be causing a lot of turbulence over the blades. Plus the gap between blad and skeg is just too small sorry. It's going to cause problems.

Jef... Mate!! that blades got a heck of a lot of pitch on it. You sure you didn't bolt on an aeroplane prop by mistake??:-)
__________________
Wheels

For God so loved the world..........He didn't send a committee.
Alan Wheeler is offline   Reply With Quote
Old 01-11-2007, 06:01   #22
Registered User

Join Date: Apr 2006
Posts: 4,413
Alan,

Negative, That's the prop the boat came with in 1985 (MD17D). I don't know the prop specs, but it performs quite well in forward and reverse. However, I've not seen any similar in the yard.

jef
sv shiva
__________________
Sandero is offline   Reply With Quote
Old 01-11-2007, 07:17   #23
Registered User

Join Date: Aug 2006
Location: Guilford, CT
Boat: Cheoy Lee Ludders 36
Posts: 48
Thanks from here as well Steve.
That looks like a much better solution for those of us with props in small apertures than the prop nut anode from defender! Yours looks like it will stay in place beautifully.
John
__________________
JohnnyC is offline   Reply With Quote
Old 01-11-2007, 07:20   #24
Registered User

Join Date: Feb 2006
Location: nyc/chesapeake
Boat: gozzard 44
Posts: 273
Wheels and Steve B make a point worth repeating. The gap between prop and skeg is too narrow. When prop is driving forward the gap narrows due to the flexible engine mounts and the flexible coupling(if you have one). Metal grinding on metal is not good.

Also, prop nuts are on in wrong sequence. Perhaps for another thread...

Ronbo
__________________
ronbo1 is offline   Reply With Quote
Old 01-11-2007, 07:34   #25
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Quote:
Originally Posted by Sailorguy View Post
This is the URL to the propeller nut zinc referred to:

BoatZincs.com (978-841-9978) - Discount Zinc Anodes
This is not a good solution. Too little zinc. If you are going to go with a prop zinc, use this style:

__________________
fstbttms is offline   Reply With Quote
Old 01-11-2007, 08:33   #26
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,586
Images: 240
Quote:
Originally Posted by ronbo1 View Post
Also, prop nuts are on in wrong sequence. Perhaps for another thread...
Ronbo
We’ve had a previous (interesting & informative) discussion regarding “Jam Nuts”
Goto:
Jam Nuts
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 01-11-2007, 12:41   #27
Senior Cruiser
 
Alan Wheeler's Avatar

Cruisers Forum Supporter

Join Date: Dec 2003
Location: Marlborough Sounds. New Zealand
Boat: Hartley Tahitian 45ft. Leisure Lady
Posts: 8,038
Images: 102
Quote:
Negative, That's the prop the boat came with in 1985
No sorry, I meant the shaft anode looked ugly. Sitting up proud from the prop boss and aft bearing like that, must create turbulence that would then flow over the blade of the prop.

Personly, I think this is install is an excellent candidate for a decent anode to be placed on the major metal area(maybe rudder if it is steel and I assume one has already been installed as such) and a shaft brush installed on the shaft in the engine room. Let the one major anode do the work. I have always found that scenario much more reliable.
__________________
Wheels

For God so loved the world..........He didn't send a committee.
Alan Wheeler is offline   Reply With Quote
Old 01-11-2007, 23:52   #28
Registered User

Join Date: Mar 2006
Location: Buena Vista Colorado
Boat: S/V Pooka Com-Pac 27
Posts: 212
Quote:
Originally Posted by Alan Wheeler View Post
bmiller, with all due respect, mate thats ugly ;-)
Yes it is. I hacked away at that one with a sawzall just to see if there would be enough material left before I went to the bother of putting one in a lathe. I thought that was enough clearance for water into the cutlass but from all the info here it appears not. Didn't realize how much forward travel of the shaft there could be.
__________________

__________________
S/V Pooka
Com-Pac 27
bmiller is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Where the Heck Does the Yanmar Internal Zinc for the Saildrive Go? schoonerdog Engines and Propulsion Systems 17 15-07-2017 12:28
Prop Zinc Minitee Propellers & Drive Systems 6 03-07-2007 20:36
Fitting a shower Talbot Construction, Maintenance & Refit 4 13-04-2006 01:51
Deck fitting re-bedding Matt Hager Construction, Maintenance & Refit 4 12-01-2006 22:43



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 14:24.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.