Hull extension on cat? - SailNet Community
LinkBack Thread Tools
post #1 of 4 Old 11-24-2008 Thread Starter
Join Date: Dec 2007
Posts: 39
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Hull extension on cat?

I found an interesting site - - where someone added hull extensions to a PDQ 36' cat. The idea seemed great from my point of view, in that a cat will probably be in my near future, and I don't want/need anything bigger than 36' for 2 people, but would like to have extra carrying capacity. The idea of hull extensions is very appealing, since the extra weight would be on the stern, with a generator and dinghy plus misc. hanging from the stern. What I don't know is how that would affect the design and performance of a cat. And if it would be so much better, why wouldn't the factory have done this? Is this a viable idea that could be used on any cat?

I'm not looking for mass approval. Is everybody ok with that?
dwightgry is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 4 Old 11-25-2008
Telstar 28
sailingdog's Avatar
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 18 Times in 14 Posts
Rep Power: 16
It'll probably have some adverse affects, like reducing the effectiveness of the steering, since it effectively moves the rudders inboard a bit.

It may increase the chance of the boat pitchpoling, by effectively moving the center of buoyancy aft and effectively moving the center of effort forward.

It may cause problems with light air performance by increasing wetted surface area drag.

It may cause problems with lee/weather helm, since it is effectively shifting the center of lateral resistance a bit aft.

If the idea was really that good an idea, don't you think they would have done it already??? BTW, it will increase the cost of haulouts and marina slips, because you're effectively making the boat longer.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

sailingdog is offline  
Quote Quick Reply Share with Facebook
post #3 of 4 Old 12-22-2008
Senior Member
danielgoldberg's Avatar
Join Date: Feb 2008
Location: New York
Posts: 679
Thanks: 0
Thanked 3 Times in 2 Posts
Rep Power: 10
Manta has done this with a fair amount of success. The Manta 42 actually started out as the Manta 38, then became the 40 and now the 42. You can tell by looking at the boat that the pontoons are extended farther aft than what you see in many brands. I don't think the only thing they did was to extend the hulls, but that was the major thing.

I don't have enough multihull experience to comment on SD's points, but we have very good friends who are cruising long term and fairly far afield in a Manta 42, and they report that the hull extensions actually reduce hobby horsing and do increase load carrying capacity because of the added buoyancy. In terms of close quarter maneuvering, I would think it wouldn't matter because you'll be doing the twin screw thing anyway, but again, I don't have personal experience with that.

The aesthetics are something that you either will like, you won't, or you're willing to deal with because of the practical benefits. The Mantas definitely have their own look, which is saying something in a catamaran world where the boats look quite similar across all lines.

Dan Goldberg

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
danielgoldberg is offline  
Quote Quick Reply Share with Facebook
post #4 of 4 Old 12-22-2008
Senior Member
chucklesR's Avatar
Join Date: Sep 2007
Location: Pasadena Md - Magothy side
Posts: 5,979
Thanks: 10
Thanked 31 Times in 31 Posts
Rep Power: 12
Seawinds 1000 became 1000xl, then 1160 by adding extensions on the back that also smoothed the water flow off the originally chopped off (straight drop) stern.
Performance was increased significantly. Too bad the rest of the boat design made it a non-starter in my view.
Seawind Catamarans
chucklesR is offline  
Quote Quick Reply Share with Facebook

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cats on Board slosharron Living Aboard 74 04-07-2014 09:12 AM
C & C 121 Customer Response to Manufacturers Post camaraderie Tartan 2 09-12-2012 03:54 PM
Ryobi vs. Makita vs. Poliglow?? CLucas Gear & Maintenance 61 05-05-2012 06:02 AM
Spring Hull Cleaning Tom Wood Gear and Maintenance Articles 0 04-05-2004 08:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome