Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 23-11-2006, 19:48   #1
Registered User
cat man do's Avatar

Join Date: Aug 2006
Location: Brisbane Australia [until the boats launched]
Boat: 50ft powercat, light,long and low powered
Posts: 4,409
Images: 36
Important information for monohul sailors

Some very important information for monohull sailors regarding catamaran build, stability and wave induced capsize.

This information was from one of the world leaders in multihull design who unfortunately passed away while sailing one of his own boats a few years back.

Most of the large catamarans sailing and motoring the world would owe part of their heritage to Lock Crowther.

Not meant in anyway as a dig at monohulls , I have owned both, but might give readers a bit more information as to why they are such a popular craft.

Look Here


"Money can't buy you happiness but it can buy you a yacht large enough to pull up right alongside it"...............David Lee Roth
Long Distance Motorboat Cruising – It Is Possible on a Small Budget
cat man do is offline   Reply With Quote
Old 25-11-2006, 08:00   #2
Registered User

Join Date: Nov 2005
Location: Ohio
Posts: 2,259
Hi Cat Man, I agree with the article, well written. Everything I've read would indicate the danger point for multi's is breaking waves higher than beam (ie size buys safety, M&M recomends 46' minimum for crossing oceans) and gusts over 35 with full working sails (ie caution is needed when rounding bluffs where wind can funnel or squalls with quickly building breezes). Most cruising multi designers calcualte 16 degree of heel will be reached at 35 knots with full working sails.

Honestly most of us don't sail where we see large breaking waves. We do see big breezes off land but that can be anticipated.

Joli is offline   Reply With Quote
Old 25-11-2006, 08:36   #3
Senior Cruiser
Talbot's Avatar

Cruisers Forum Supporter

Join Date: Jun 2004
Location: Brighton, UK
Boat: Privilege 37
Posts: 3,578
Images: 32
Breaking waves are exceedingly dangerous for both mono and multihull

see multihull

and mono

which is why I always advocate a series drogue for those boats that have a stern capable of holding one:

These have been checked in a tank test in UK with the following results

no drogue


with thanks to for making these videos available

At least these were available, but the link seems to be down at the moment
"Be wary of strong drink. It can make you shoot at tax collectors - and miss."
Robert A Heinlein
Talbot is offline   Reply With Quote
Old 25-11-2006, 09:01   #4
Registered User

Join Date: Jul 2005
Location: Wherever HP takes us
Boat: 1974 Challenger 40 Ketch, Holding Pattern
Posts: 107
I would be amazed if a multihull (or monohull) company put out any other report... there is something about the government writing a report on their own performance that gives me the willies. I don't honestly believe that any company is going to publish a critical report on their own performance.
Something about the multihull being "absolutely unbeatable" that I just don't buy into. I only know of one thing sailing that is absolute...

No wind or 30 on the nose.

Please don't flame me, I'm just being honest.
S/V Holding Pattern
Brian & Heather
Follow our adventure at
Holding Pattern is offline   Reply With Quote
Old 25-11-2006, 09:43   #5
Kai Nui

Posts: n/a
Talbot, not just you. The site is accessable, but all video links are down.
Holding Pattern, I do not disagree with you. It is true that facts can be interpreted to benefit the person presenting them. But, the facts in this article seem pretty clear to me. I have been a mono person my whole life, and only recently got invlolve with multis. The one factor that seems consistant, when looking for public opinion is the vast majority, (in fact 100% of those I have spoken with) seem to say now that they have sailed multi's, they would not go back to a mono. This is not to say there is anything inferior about mono's. But, it seems there must be something about multi hulls that people find superior.
  Reply With Quote
Old 25-11-2006, 11:21   #6
Registered User

Join Date: Nov 2005
Location: Ohio
Posts: 2,259
There are as many ways to manage storms as there are different boats. Very large boat won't run off, they don't trail warps, the loads on the steering gear and the warps would be truly frightning. Typically they'll motor sail into the breeze. We have enough waterline that we can run off in most anything but will fore reach in breaking waves. Multi's seem to like a parachute off the bow or managing speed downwind as long as waves aren't breaking. Smaller mono's are best running with drougues or fore reaching when running off becomes too dangerous.

The only way to tell what is best for your boat is to spend time sailing it. Go out when it's blowing and see what it does and how it responds.
Joli is offline   Reply With Quote
Old 25-11-2006, 17:01   #7
Senior Cruiser
sneuman's Avatar

Cruisers Forum Supporter

Join Date: May 2003
Location: Grenada
Boat: Tayana 37 Cutter
Posts: 3,138
Images: 37
Kai (Scott),

But I have sailed both multis and monos, and I can't see ever going to a multi!

Sorry to be the exception!
sneuman is offline   Reply With Quote
Old 25-11-2006, 17:38   #8
Kai Nui

Posts: n/a
Always has to be one weed in the lawn Actually, Scott, you are the first person I have ever heard say that, but I understand how the different motion could be less comfortable. As I mentioned earlier, the motion on a tri was a problem for me at first, but is just different enough from a power boat to be comfortable. It is still not as comfortable to me as a mono, but the other advantages outweigh that concern.

  Reply With Quote

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
Firearms Regulations by Country GordMay Rules of the Road, Regulations & Red Tape 97 31-08-2010 10:38
Watermaker Information Request tomj Plumbing Systems and Fixtures 18 18-04-2007 09:48
GUNS eskfreedom Health, Safety & Related Gear 63 20-06-2006 18:09

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:13.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.