Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 27-09-2014, 06:03   #1
Registered User

Join Date: Sep 2011
Location: Durban South Africa
Boat: WALLER MKII CAT 11M
Posts: 103
Stern tube / shaft log

Hi, could stainless steel tube be used for a shaft log / stern tube. I see Glen L offer the shaft log in aluminum or bronze, FRP yacht changing sail drive to shaft drive, any suppliers recommended , thanks in advance
__________________

__________________
delcrest is offline   Reply With Quote
Old 27-09-2014, 06:30   #2
Certifiable Refitter/Senior Wannbe
 
Wotname's Avatar

Cruisers Forum Supporter

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: Van DeStat Super Dogger 31'
Posts: 7,331
Re: Stern tube / shaft log

Stainless is a poor choice; bronze is good.
__________________

__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 08-10-2014, 20:48   #3
Registered User

Join Date: Dec 2010
Location: Pacific Northwest
Boat: 1968 Alberg 30
Posts: 193
Re: Stern tube / shaft log

Yep, agree, bronze hands down better for shaft log. Stainless can develop serious crevice corrosion in places where it is entrained in hull underwater. Bronze is much more inert, and with a little bit of catholic protection will last forever.
__________________
Glenn.Brooks is offline   Reply With Quote
Old 08-10-2014, 22:23   #4
Registered User

Join Date: Dec 2007
Location: Duluth,Minnesota
Boat: Lindenberg 26 & Aloha 8.2
Posts: 984
Re: Stern tube / shaft log

Bronze, or G10
__________________
clockwork orange is offline   Reply With Quote
Old 09-10-2014, 10:57   #5
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
Re: Stern tube / shaft log

Many trawlers like ours came with a SS stern tube. Ours is about 7 feet long. They are subject to issues but mostly from electrolysis. They can also suffer from corrosion, but that isn't what usually does them in. If I had my preference, it would be bronze but it too can suffer the same fate. Chuck
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 10-10-2014, 02:45   #6
Certifiable Refitter/Senior Wannbe
 
Wotname's Avatar

Cruisers Forum Supporter

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: Van DeStat Super Dogger 31'
Posts: 7,331
Re: Stern tube / shaft log

FWIW, I pulled my bronze stern tube a looksee after about 30+ years service; it was perfect and so was refitted
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 10-10-2014, 06:29   #7
Registered User

Join Date: Dec 2007
Location: Duluth,Minnesota
Boat: Lindenberg 26 & Aloha 8.2
Posts: 984
Re: Stern tube / shaft log

Bronze is superior to any grade of SS below the waterline for fiittings and fasteners, you would rarely see ss prop struts, thru hulls etc. Copper is another readily available metal that works well but these days we often will use G10 or FRP for items like stern tubes, its easy to buy, reasonably priced and easy to make your own if you are so inclined.

Steve.
__________________
clockwork orange is offline   Reply With Quote
Old 11-10-2014, 00:05   #8
Registered User

Join Date: Sep 2011
Location: Durban South Africa
Boat: WALLER MKII CAT 11M
Posts: 103
Re: Stern tube / shaft log

Quote:
Originally Posted by clockwork orange View Post
Bronze is superior to any grade of SS below the waterline for fiittings and fasteners, you would rarely see ss prop struts, thru hulls etc. Copper is another readily available metal that works well but these days we often will use G10 or FRP for items like stern tubes, its easy to buy, reasonably priced and easy to make your own if you are so inclined.

Steve.
Sorry what's G10 and assume FRP would be a type of fibre wound "pipe"..... Sorry not familiar with these term in "darkest Africa "
What is the correct grade of bronze and stainless to use for the stern tube, and and handrails fittings etc on deck.... Thanks in advance
__________________
delcrest is offline   Reply With Quote
Old 11-10-2014, 14:57   #9
Registered User

Join Date: Aug 2007
Location: West Indies
Boat: Burger 74' motor yacht, 65 foot 12 metre, Flicka and sailing dinghy
Posts: 635
Re: Stern tube / shaft log

If the hull is aluminum, have to go with SS. Just like seacocks.
Steel may have the same issue. That would explain why SS is offered for sale, not bronze.


Sent from an undisclosed location on the high seas or from the lounge chair by the pool, you decide.
__________________
To a hammer, everything looks like a nail.
dohenyboy is offline   Reply With Quote
Old 11-10-2014, 21:15   #10
Registered User

Join Date: Dec 2007
Location: Duluth,Minnesota
Boat: Lindenberg 26 & Aloha 8.2
Posts: 984
Re: Stern tube / shaft log

Quote:
Originally Posted by delcrest View Post
Sorry what's G10 and assume FRP would be a type of fibre wound "pipe"..... Sorry not familiar with these term in "darkest Africa "
What is the correct grade of bronze and stainless to use for the stern tube, and and handrails fittings etc on deck.... Thanks in advance
G10 is an epoxy/glass laminate made up of many layers of glass cloth, FRP is a similar product but polyester resin, while the G10 is the higher quality product FRP would be more than adequate in a polyester boat, i see no reason to use metal for the stern tube in a glass boat. If you can't buy it locally as i said it is easy to make your own by wrapping glass around a mandrel to a thickness of about 1/4". Im not certain which bronze alloy to use, probably silicone bronze, i have not actually used bronze, i have always used heavy wall copper on all cold molded and cedar strip boats i have built in the past but would probably use G10 today. I would not use any grade of stainless steel for this. Type 316 SS is typical for deck hardware.

Steve.
__________________
clockwork orange is offline   Reply With Quote
Old 11-10-2014, 21:16   #11
Registered User

Join Date: Sep 2011
Location: san diego
Boat: yorktown custom 40' cutter
Posts: 228
Re: Stern tube / shaft log

G10 is a fiberglass/epoxy composite cured under heat and pressure and its mechanical properties approach alu. prefab tube is available from Macmaster-carr and others. I used 3" OD X 2"ID for an 1 1/4" shaft with vesconite bearings.

FRP is fiber reinforced plastic
__________________
robwilk37 is offline   Reply With Quote
Old 11-10-2014, 21:19   #12
Registered User

Join Date: Dec 2007
Location: Duluth,Minnesota
Boat: Lindenberg 26 & Aloha 8.2
Posts: 984
Re: Stern tube / shaft log

Quote:
Originally Posted by dohenyboy View Post
If the hull is aluminum, have to go with SS. Just like seacocks.
Steel may have the same issue. That would explain why SS is offered for sale, not bronze.


Sent from an undisclosed location on the high seas or from the lounge chair by the pool, you decide.
Im sure that you would use welded in aluminum on an aluminum boat and steel or ss welded in on a steel boat, i cant imagine using a ss stern tube on an aluminum boat.

Steve.
__________________
clockwork orange is offline   Reply With Quote
Old 17-10-2014, 12:37   #13
Registered User

Join Date: Apr 2014
Location: Mandeville, LA
Boat: Tartan 30
Posts: 48
Re: Stern tube / shaft log

Quote:
Originally Posted by Glenn.Brooks View Post
Bronze is much more inert, and with a little bit of catholic protection will last forever.
Does catholic protection mean just checking on it every Sunday and ignoring it the rest of the week?
__________________
GuidoY is offline   Reply With Quote
Old 17-10-2014, 12:40   #14
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 17,770
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Re: Stern tube / shaft log

unfortunately mine is stainless. i much prefer bronze.
zeehag is offline   Reply With Quote
Old 18-10-2014, 08:51   #15
Registered User

Join Date: Sep 2011
Location: Durban South Africa
Boat: WALLER MKII CAT 11M
Posts: 103
Re: Stern tube / shaft log

Pm sent
__________________

__________________
delcrest 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
Old Log will be moved to opencpn.log.log PHD1026 OpenCPN 26 19-05-2015 14:01
PSS Shaft Seal; any tricks to finding the center of the shaft in the stern tube? Wireless1 Propellers & Drive Systems 31 03-04-2014 18:39
For Sale: New PSS Shaft Seal for 1" shaft and 2" stern tube. funjohnson Classifieds Archive 1 02-02-2013 19:37
Drilling Hole In S/s Square Tube Weakening Tube? HueyHuey Construction, Maintenance & Refit 19 07-01-2013 17:30
Strut, Shaft, Shaft Log, Engine Alignment KestrelBuck Engines and Propulsion Systems 24 04-04-2011 00:14



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 00:08.


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.