Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 18-09-2009, 22:27   #1
Registered User
 
boat_alexandra's Avatar

Join Date: Aug 2009
Location: Masachusetts
Boat: bristol 27
Posts: 2,803
Wind Generator Mount - Copper or Steel?

Hi,

I have two pipes I can use to mount my Air-X marine wind generator with. One pipe is copper, the other steel.

I thought the copper one would be better because it is lighter, but turns out I'm wrong, both pipes weigh the same. I think the only advantage of copper is it doesn't corrode correct? The advantage to steel is it is stronger, but is copper strong enough?


The manual for the generator says not to use plastic and that steel pipe would work.
__________________

__________________
boat_alexandra is offline   Reply With Quote
Old 19-09-2009, 01:46   #2
Registered User
 
Zanshin's Avatar

Join Date: Feb 2007
Location: Caribbean
Boat: Jeanneau 57
Posts: 1,621
Is your second pipe stainless steel? What are you going to attach the supports to (more metal or to fiberglass or wood)?
__________________

__________________
Zanshin is offline   Reply With Quote
Old 19-09-2009, 02:26   #3
cruiser

Join Date: Sep 2007
Location: Tampa to New York
Boat: Morgan 33 OutIsland, Magic and 33' offshore scott design "Cutting Edge"
Posts: 1,594
If I remember correctly the pipe should be able to support 150lbs of horizontal load. You could test the copper by figuring distance from wind gen to first diagonal brace, cantilevering that much off table or something and suspending 150lbs off end. Make sure when you mount it you use rubber isolation mounts so you don't get vibration through the hull. Makes a huge difference. I found a method that costs very little using rubber stock, bimini fittings and a piece of hd engine hose.
__________________
forsailbyowner is offline   Reply With Quote
Old 19-09-2009, 05:14   #4
Don't ask if you can't handle it
 
sailorboy1's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: On the boat somewhere
Boat: Hunter 410
Posts: 12,311
use the steel, paint it

copper isn't an acceptable structural support type of material, when I used to structrual I don't even remember even seeing a bending chart for copper pipe, because no one would think to use it for this
__________________
sailorboy1 is offline   Reply With Quote
Old 19-09-2009, 08:22   #5
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,580
Images: 240
Quote:
Originally Posted by Don Lucas View Post
use the steel, paint it
Copper isn't an acceptable structural support type of material, when I used to structrual I don't even remember even seeing a bending chart for copper pipe, because no one would think to use it for this
I agree.
__________________
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 19-09-2009, 08:47   #6
Vendor
 
witzgall's Avatar

Join Date: Oct 2006
Location: Eastern Shore, MD
Boat: Camper Nicholson 44 Ketch
Posts: 1,775
How about Schedule 80 1.5" aluminum pipe? Easy to cut, don't need to paint. It is slightly smaller than 2" at 1.9 (I think, look it up) but you could shim it with inner tube, which might also serve as an isolator as well.

Chris
__________________
witzgall is offline   Reply With Quote
Old 19-09-2009, 10:48   #7
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,150
I would consider aluminum or stainless. The other downside to copper is that it is heavy for its strength. If you go with either of the former metals make sure you get a grade that is suitable for the marine environment.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 19-09-2009, 15:52   #8
Registered User
 
boat_alexandra's Avatar

Join Date: Aug 2009
Location: Masachusetts
Boat: bristol 27
Posts: 2,803
Quote:
Originally Posted by forsailbyowner View Post
If I remember correctly the pipe should be able to support 150lbs of horizontal load. You could test the copper by figuring distance from wind gen to first diagonal brace, cantilevering that much off table or something and suspending 150lbs off end. Make sure when you mount it you use rubber isolation mounts so you don't get vibration through the hull. Makes a huge difference. I found a method that costs very little using rubber stock, bimini fittings and a piece of hd engine hose.
The copper pipe can easily support this, but it will flex more than the steel. Steel is about 4x stronger than copper, but the same weight. Aluminum is half as strong as steel, but 1/4th the weight roughly (correct me if I'm wrong) In either case, I think the copper may be strong enough.

Quote:
How about Schedule 80 1.5" aluminum pipe? Easy to cut, don't need to paint. It is slightly smaller than 2" at 1.9 (I think, look it up) but you could shim it with inner tube, which might also serve as an isolator as well.
I would love to use aluminum, but I'm working with the junkyard here, and that is not available. As for painting steel, I need a metal primer first right? Am I going to have to keep repainting it every few years?
__________________
boat_alexandra is offline   Reply With Quote
Old 19-09-2009, 16:26   #9
cruiser

Join Date: Sep 2007
Location: Tampa to New York
Boat: Morgan 33 OutIsland, Magic and 33' offshore scott design "Cutting Edge"
Posts: 1,594
If the copper can support the 150 lbs it conforms to southwest windpower's requirements for a tower. I built mine out of available material also, luckily someone offered me a 20 ft stainless pole for $20. To make the Isolation mounts I took a 6" piece and cut 3/4" notches in the end and bent them inward so it closes the end except for a hole in the middle. On one end I drilled holes for bolting to the deck.then I did the same to one end of the long piece. I used some of the heavy duty wire-in wet exhaust hose to join them with rubber between the two butt ends so they don't touch. I used an old shorepower cord for the cabling. Double clamped the hose and made a canvas cover to protect hose from UV. For the diagonals I bolted stainless bimini deck hinges through rubber to deck. Been through many gales and squalls never had tower issues. My ammeter from SW windpower melted down on an upwind sail. If you want one with a shunt(much safer) they have them at MPJA.com for under $10. Part #17679ME. Great price considering they want over twice that for one without shunt.
__________________
forsailbyowner is offline   Reply With Quote
Old 19-09-2009, 16:47   #10
Registered User
 
Martinini's Avatar

Join Date: Jul 2008
Location: Where ever my boat is.
Boat: Allied Princess 36'
Posts: 258
Check this place out for Brass and Stainless steel tubing and fittings. In most cases 1/2 the price of most suppliers and as good or in most cases better than other suppliers.MARKSTAAR - Tubing, Rails and Fittings - Category Details
__________________
Martinini is offline   Reply With Quote
Old 19-09-2009, 18:21   #11
Registered User
 
clausont's Avatar

Join Date: Mar 2007
Location: Pacific NorthWest
Boat: Sold - Landlocked
Posts: 561
Images: 60
One other thing to keep in mind about copper is that it is more susceptible to vibration fatigue than steel or aluminum.
__________________

clausont is offline   Reply With Quote
Old 19-09-2009, 18:35   #12
Senior Cruiser

Cruisers Forum Supporter

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 17,314
Alu or 316.
__________________

__________________
barnakiel is offline   Reply With Quote
Reply

Tags
generator, wind generator

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
Wind generator captden Electrical: Batteries, Generators & Solar 2 30-06-2009 01:59
Wind Generator Mizzen Mount Snboard976 Electrical: Batteries, Generators & Solar 0 18-06-2009 16:11
Wind Generator billangiep Electrical: Batteries, Generators & Solar 60 07-06-2008 13:06
wind to water generator noelex 77 Electrical: Batteries, Generators & Solar 3 10-04-2008 15:29
wind generator capt lar Electrical: Batteries, Generators & Solar 10 31-08-2005 19:46



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 10:46.


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.