...Tween keels...

I'm looking for some research results from the field of tween keel hydrodynamics. It appears that TK offers lots of advantages over the clasic single keeler. Douglas Philips Birt's chapter on TK in ' Sailing yacht design ' is quite intriguing.

Any link or advice would be really appreciated!

Thanks

 

Hey fradrigo;

These guys, http://www.kastenmarine.com/index.htm
have some good essays about twin keels and other topics as well.
Twin keels are here:
http://www.kastenmarine.com/roll_attenuation.htm

article about twin keels for specific design of theirs;
http://www.kastenmarine.com/bilge_keels.htm

Page of most all their essays;
http://www.kastenmarine.com/articles.htm

later,
Forrest

 

Thanks Forrest, very nice articles...mentioned is work of Pat Bray. Here you can find some of mr.Bray's thoughts on tween keels:

http://www.brayyachtdesign.bc.ca/

Now I'm getting closer Does anybody have the mentioned Lord Riverdale's RINA 1967 article ?

Thanks

 

Twin Lifting Keels

Check out Doug Schickler's SY-X 24 with twin, curved, lifting ballast keels:
First Use of Foil Assist on Mono Keelboat? - Boat Design Forums
Address:http://www.boatdesign.net/forums/showthread.php?p=121605