Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 28-08-2008, 15:34   #1
Registered User

Join Date: Jun 2008
Location: Calgary, Alberta/Port Alberni, BC
Boat: Catalac 10M
Posts: 23
Mast stiffness on a multihull vs mono

Is there a significant difference between mono-hulled and multi-hulled masts? Is mast specifying an experts domain? Or can I just replace mine with any mast of appropriate length?
__________________

__________________
thims is offline   Reply With Quote
Old 28-08-2008, 15:39   #2
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,150
With everything else being equal meaning displacement, sail area, etc, catamaran masts are beefier because the initial righting moment of a catamaran is greater than the initial righting moment of a monohull. The loading on the sail is directly proportional to righting moment. Loading on the sails then has to be transmitted to the hull via the spars and rigging.

Naval architects determine the scantlings of the spars and mast. Replacing your mast "with any mast" is not advisable without consulting a naval architect or someone who is very familiar with doing this.
__________________

__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 28-08-2008, 15:44   #3
Registered User

Join Date: Jun 2008
Location: Calgary, Alberta/Port Alberni, BC
Boat: Catalac 10M
Posts: 23
So do I need a naval architect to specify a new mast?
__________________
thims is offline   Reply With Quote
Old 28-08-2008, 15:49   #4
Registered User

Join Date: Nov 2005
Location: Ohio
Posts: 2,313
No......

You need a spar maker. They know what section to use and how long an unsupported panel can be.

Ever wonder why multi's have diamonds and most monos don't? It's how you support the panels.
__________________
Joli is offline   Reply With Quote
Old 28-08-2008, 15:51   #5
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,150
Quote:
Originally Posted by thims View Post
So do I need a naval architect to specify a new mast?
Not necessarily, you need to consult with someone who is very knowledgeable about replacing masts or the boats manufacturer. You definitely need to find out if your new mast is the equivalent or the better of your old mast. If you cant find a naval architect then you may try your boat yard manager or even a really good rigger. I second Joli's idea as well.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Reply

Tags
mast, multihull

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
Monohull or Multihull Sailboat? Gisle Multihull Sailboats 546 09-03-2015 09:42
Retrofitting a wood mast vs current metal mast grefark Deck hardware: Rigging, Sails & Hoisting 7 07-09-2008 22:44
mono sailors looking for the right cat cbeagle Multihull Sailboats 24 08-07-2008 05:49
Mono or Cat lane General Sailing Forum 9 06-06-2005 02:02



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 14:48.


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.