Building Cruising Catamaran: What is the ideal beam width on each hull? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > Welcome to Sailnet > Introduce Yourself
 Not a Member? 

Introduce Yourself Welcome to the Sailnet.com - The world's largest online sailing community! Tell us about yourself so we can get to know you. NEW!


Reply
 
LinkBack Thread Tools
  #1  
Old 08-09-2011
Junior Member
 
Join Date: Aug 2011
Location: Jakarta, Indonesia
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
masindi is on a distinguished road
Building Cruising Catamaran: What is the ideal beam width on each hull?

Hi,

I am designing a 30ft coastal cruising catamaran in Jakarta, Indonesia and would like to know the ideal beam width for each hull that is suitable for simple and comfortable accommodation.

Based on Terho Halme's suggestions, the "length/beam ratio" of each hull should be between 9 and 12 for a comfortable cruiser. 8 would increase wave making and should be avoided. But if I aim for a ratio of 9, that means the beam width ends up only 3ft 3in wide (way too tight for accommodation, not to mention for retractable daggerboard).

Any suggestion for the ideal hull beam width for this 30ft cat?


Thank you!

Indi Soemardjan
Jakarta, Indonesia
Reply With Quote Share with Facebook
  #2  
Old 08-10-2011
Iroquois MkII
 
Join Date: Feb 2007
Location: Massachusetts
Posts: 241
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
LookingForCruiser is on a distinguished road
The beam of the hulls on my 30' Iroquois is 3'6". Yeah, they're narrow. I don't recall the Gemini's I've been on being any wider.

The centerboards on my Iroquois aren't in the middle of the hull, they're on the side and are angled inwards as they go down. So they are mostly out of the way.
Reply With Quote Share with Facebook
  #3  
Old 08-12-2011
old salt
 
Join Date: Aug 2011
Location: presently colombia, but home is england
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
johnreggie is on a distinguished road
Send a message via Skype™ to johnreggie
Check out Woods Windsong catamaran . Mine is 30 ft. Hulls are deep v and widen to 5 feet max. Total beam is 18 feet. Draught 2ft 8 inches. fixed keels . Pylwood and fibreglass sheathing.
Reply With Quote Share with Facebook
  #4  
Old 08-30-2011
Junior Member
 
Join Date: Aug 2011
Location: Jakarta, Indonesia
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
masindi is on a distinguished road
Thank you for the feedback, gentlemen

Woods Windsong dimension seems ideal but it's V hull creates hobby horsing I heard.
Reply With Quote Share with Facebook
  #5  
Old 08-30-2011
old salt
 
Join Date: Aug 2011
Location: presently colombia, but home is england
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
johnreggie is on a distinguished road
Send a message via Skype™ to johnreggie
Building Cruising Catamaran. Beam width.

Hello, I appreciate your concern about hobby horsing using deep v hulls , and agree that my Woods Windsong tends to do this. I imagine a wider v may be better eg 50 or 60 degrees, and wider keel as well. This would mean more complex shaping with an angle or fold around half way up the hull's height., in other words a u shape rather than v. Keeping as much mass as possible near to the centre of length helps a lot, so I load up to suit, keeping only light stores at the ends of the boat .
Reply With Quote Share with Facebook
  #6  
Old 08-30-2011
Junior Member
 
Join Date: Aug 2011
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Cap10paul is on a distinguished road
Hull beam

Masindi,
I had a 24' Hirondell with a 15' beam and hulls that were 4'. Daggers were outboard in the hulls and out of the way.
Now have a 1993 lagoon 42' with 20' beam and 6.5 inside hulls amidships. No discernible hobby horse unless too close hauled.
Reply With Quote Share with Facebook
Reply

Tags
catamaran


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Recommended Width of Slip for 9'1" Beam??? Joel73 General Discussion (sailing related) 14 02-08-2008 12:58 PM
What are your ideal cruising sails? SoOkay Gear & Maintenance 5 07-20-2006 04:10 PM
Building a catamaran dashley25 Living Aboard 1 08-11-2003 03:46 PM
catamaran width gto2 Cruising & Liveaboard Forum 3 07-30-2001 08:22 PM
Building a Catamaran Mark Matthews Gear and Maintenance Articles 0 08-22-2000 08:00 PM


All times are GMT -4. The time now is 07:27 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012