Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 17-03-2007, 04:24   #1
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,579
Images: 240
Radical new “Loop Keel”

Howes-Macnaghten Technology Ltd in the UK has patented a new keel design that is claimed to offer significant benefits in both speed and seaworthiness, with the added advantages of a kinder motion and greater comfort at sea.
Goto: Loop Keel - Overview
And follow the links (benefits, theory, etc)
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 17-03-2007, 05:51   #2
Registered User

Join Date: Apr 2006
Location: Galveston
Boat: C&C 27
Posts: 724
Interesting idea that might just go somewhere if...
__________________

__________________
Pura Vida is offline   Reply With Quote
Old 17-03-2007, 08:48   #3
Registered User
 
Connemara's Avatar

Join Date: Oct 2006
Location: Toronto, Canada
Boat: Mirage 27 in Toronto; Wright 10 in Auckland
Posts: 671
Images: 2
Looks like a neat idea.

I wonder if they plan to offer this as some sort of retrofit. There's a hint of that (can't recall the phrase... it was more than two minutes ago that I read it) but I can't see how it could be done, without ripping the hull open.

Connemara
__________________
Connemara is online now   Reply With Quote
Old 17-03-2007, 08:59   #4
Registered User

Join Date: Aug 2006
Location: Utah
Posts: 87
Looks alot like a hydrofoil.
__________________
Gator81 is offline   Reply With Quote
Old 17-03-2007, 14:36   #5
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
The Catamaran industry has been experimenting with foils between the sponsons. One for strenght and the other as a wing. The problem they've incountered is that kelp, sea grass and other debree gets caught up on the foils.

As for monohulls one would have to strenghten the upper part of the hull to support such a system. That in turn would most likely raise the COG (center of gravity) but on the otherhand strengthen the chainplate/rigging areas.

It looks cute though!

And I'm not too sure, how well, it would take a grounding................._/)
__________________
delmarrey is offline   Reply With Quote
Old 17-03-2007, 15:24   #6
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Looks and sounds a bit too good. I would really like to see some unbiased test results.
__________________
The Blue Dot Campaign. This Changes Everything.
DeepFrz is offline   Reply With Quote
Old 17-03-2007, 16:54   #7
Senior Cruiser
 
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,192
Wonder how many lobster pots you could catch in one pass? Kelp definitely would be a problem.
Hmmm! Don't think I'll get one.
JohnL
__________________
SkiprJohn is offline   Reply With Quote
Old 17-03-2007, 20:44   #8
Registered User

Join Date: Nov 2006
Posts: 976
Images: 6
Not quite the same but the bilge keeler lot have been mucking around with asymetrical foils for ages (and getting good results it seems). l could also see "stuff" running down the swept back section of the loop and then getting caught on the bottom, unlike a straight keel where hopefully it falls off the bottom.
__________________
cooper is offline   Reply With Quote
Old 18-03-2007, 05:06   #9
Registered User
 
swagman's Avatar

Join Date: Sep 2005
Location: Winter land based UK New Forest. Summer months away. Making the transition from sail to power this year - scary stuff.
Boat: Super Van Craft 1320 Power Yacht
Posts: 2,175
Images: 10
Send a message via Skype™ to swagman
Another negative is maybe the loading on the windward foil - as the yacht heels and lifts, the hydrodynamic forces get applied further and further aft on the keel section still under the water.

Having once owned a 15 foot wide 30 footer who'd rudder did the same (and which saw us snap tillers and even nearly rip the transown hung rudder off) I'd be interested to see if this aft moving CoE is actually good for the crew (they boast reduces broaching inclinations) or bad for the boat (ripping keel off).

Guess we'll see once on a real boat.

JOHN
__________________
Don't take life too seriously. No ones going to make it out alive......Go see our blog at http://www.sailblogs.com/member/yachtswagman/
swagman is offline   Reply With Quote
Old 18-03-2007, 15:43   #10
Registered User
 
beau's Avatar

Join Date: Dec 2006
Location: Brisbane Australia
Posts: 757
Images: 1
Whats a keel?
What do you use it for?

Oh thats right, its the thing under the boat that keeps hitting things and makes you anchor out in the deep water where you can roll around all night.

regards,
Beau
Multihull Enthusiast
__________________
beau is offline   Reply With Quote
Old 20-03-2007, 01:27   #11
Marine Service Provider
 
GMac's Avatar

Join Date: Oct 2005
Location: North of the Bridge, thankfully
Boat: R930
Posts: 1,659
We played with a very similar set-up back in the early 80's. Found it worked damn well for cleaning the harbour of seaweed. Tried a few differing things with it but finally gave it away as the gains just were not there. It was actually slower at times and seemed to increase the pitching.

Maybe they have found something we didn't but it looks very very similar.
__________________
GMac is offline   Reply With Quote
Old 20-03-2007, 03:26   #12
Registered User
 
mudnut's Avatar

Join Date: Dec 2005
Location: Australia
Posts: 666
What a way to "Collar a whale."And a new concept in "Diving to the depths".China is making a bid for the America's cup,maybe we will see it there,along with a photo of Alan Bond.Mudnut.
__________________
mudnut is offline   Reply With Quote
Old 20-03-2007, 07:35   #13
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2006
Posts: 1,594
Quote:
Originally Posted by beau
Whats a keel?
What do you use it for?

Oh thats right, its the thing under the boat that keeps hitting things and makes you anchor out in the deep water where you can roll around all night.

regards,
Beau
Multihull Enthusiast
It's also good for turning the hull right side UP after a roll!!
__________________
Randy

Cape Dory 25D Seraph
rtbates is offline   Reply With Quote
Old 20-03-2007, 07:59   #14
Registered User

Join Date: Mar 2007
Location: Rochester NH
Boat: 48' Custom Built Pilothouse Cutter
Posts: 2
Not for me. I see many problems with Lobster pots on that design. Could add a fish net to it and have a great place to catch your dinner.
__________________
genepartridge is offline   Reply With Quote
Old 20-03-2007, 08:32   #15
Registered User

Join Date: Jul 2006
Location: Tintern, Wales
Boat: Westerly 33, Dunkers of Tintern
Posts: 83
Could be useful for a navy minesweeper to catch moored mines. Also if it inverted you could use it as a goal for water polo
__________________

__________________
Dunkers is offline   Reply With Quote
Reply

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
Radical Boat Designs cat man do General Sailing Forum 5 26-03-2008 15:53



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:30.


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.