Cutout Keel

Comment

Comment by Steve Knight on March 22, 2010 at 11:13pm

Arguments for tandem keels from web site posted by Terri yesterday copied here for your convenience.

Advantages of a Tandem Keel



- reduced draft

- even though the draft is reduced you achieve the same range of stability as a deep keel (the center of gravity is kept low by putting weight from center of keel into bulb). Also slightly heavier than a standard keel

- same pointing ability as a deep keel. Each wing has a higher aspect ratio and are working more efficiently when compared to a single lower aspect ratio keel.

- better damping of pitch and roll

- smarter tacking

- better directional stability and resistance to broaching

- tank testing and actual use indicate improved performance and general “behavior” over shoal keel. Performance comparable to a deeper draft keel

- larger attachment plate reduces loads on hull during groundings

Comment by Steve Knight on March 22, 2010 at 11:07pm

Most interesting, Terri. I'll buy some of the theory, but not all of the execution as evidenced in the photo. Thanks for chasing that down.

Comment by Terri on March 21, 2010 at 3:23pm

Just found it... Bavaria's tandem keel... makes sense now that I've read about it.. http://www.ilikeit.net/HoopersYachts/index.cfm?IM=FrameSet&Page...

Comment by Terri on March 21, 2010 at 12:18pm

yep, on the pimpin out of the keels. Getting mine painted in a tye dye motif with sequins & pearl swirls :-)

Comment by ___/)ances With Sails on March 21, 2010 at 12:07pm

yall pimpin out yer keels now so they look cool on th hard?

louvered keel? billet keel? imaginin an ineffecient eddy effect on th aft half from th fwd half.

Comment by Terri on March 21, 2010 at 10:05am

Someone on another sailing site said it may be a Bravaria

Comment by Terri on March 21, 2010 at 8:34am

Not a clue. Too much shrinkwrap, nobody around. Also saw a rudder with diamond shaped cutouts. Should have taken a pic of that too. Maybe to let some water thru so not too much drag? Clueless on why on a keel..would think you'd want that resistance. Don't know enough about.

Comment by Steve Knight on March 21, 2010 at 8:31am

Very strange. Any info on what model boat?