Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 11-04-2016, 10:49   #16
Registered User
 
earthbm's Avatar

Join Date: Oct 2010
Location: Corona Del Mar
Boat: Dragonfly 35
Posts: 81
Re: Trimaran sailors..........

A bit confused here. Are people talking about mini-keels on the main hull? On a trimaran?

If keel = weighted bulb, how does it contribute to the righting moment, given the small heel angles?






Dragonfly 35 Tri
__________________

__________________
earthbm is offline   Reply With Quote
Old 11-04-2016, 12:44   #17
Registered User
 
w32honu's Avatar

Join Date: Dec 2009
Location: New Hampshire
Boat: Custom Marples 40 FC
Posts: 432
Images: 2
Re: Trimaran sailors..........

Quote:
Originally Posted by earthbm View Post
A bit confused here. Are people talking about mini-keels on the main hull? On a trimaran?

If keel = weighted bulb, how does it contribute to the righting moment, given the small heel angles?






Dragonfly 35 Tri
Yes this would be an LAR (Low Aspect Ratio) mini keel with some sort of NACA shape. Low aspect in terms of depth to chord. So the keel would be only 12 to 18 inches deep generally. Mounted on the main hull only.......although some designs have mini keels on the Amas much like a catamaran. The total draft with keel might average 3' 6" to 4' 0".

But there is no ballast or lead weight. It is strictly for resistance of leeway and not for stability or righting moment. That is provided by the buoyancy of the Ama. In fact some mini keel designs add slightly to buoyancy.............just the opposite of a ballasted keel.
__________________

__________________
w32honu is offline   Reply With Quote
Old 11-04-2016, 13:33   #18
Registered User
 
earthbm's Avatar

Join Date: Oct 2010
Location: Corona Del Mar
Boat: Dragonfly 35
Posts: 81
Trimaran sailors..........

Oh, so basically a reinforced fixed daggerboard? Gotcha. Not having turbulence in the slot behind a centerboard may compensate for the shorter aspect I suppose.

As far as claims about pointing pointing I suspect most would just look at AWA, because recording leeway is too much work.


Dragonfly 35 Tri
__________________
earthbm is offline   Reply With Quote
Old 11-04-2016, 14:41   #19
Registered User
 
Fast Scarab's Avatar

Join Date: Sep 2012
Posts: 10
Re: Trimaran sailors..........

Quote:
Originally Posted by Factor View Post
An endorsement of Fast Scarab's designs, I had a 9 metre tri of his and it was a great boat.
Thanks Factor, hope to see you out on the water in a year or so.
Ray
__________________

__________________
Ray Kendrick
Team Scarab
Fast Scarab is offline   Reply With Quote
Reply

Tags
sail, trimaran

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
Stoked To Be Here And Meet Other Like Minded Sailors, Especially Female Sailors. chicasurfer Meets & Greets 15 02-12-2016 16:47
Your catamaran or trimaran Gisle Multihull Sailboats 56 30-03-2008 15:19



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:44.


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.