--- On Tue, 11/3/09, Mike Crawford <jmichael@gwi.
A question for anyone skilled in fluid mechanics: would two higher-aspect keels or mini foils be better than a single lower-aspect keel? I'm told the twins would generate more lift, but don't know if that's true or not.
Also, how deep? My guess is that 300-450 mm would be enough to help handling without being too obtrusive.
- Mike
*****
I'm not skilled in fluid mechanics but I'll answer anyway :) My note is more on the practical side.
If you plan to have the thruster between tandem keels they need to be deep enough to allow the propeller size plus some distance between propeller and bottom. If saildrive units allow typically maximum of 16" propellers (40 cm) and there should be minimum on 5 cm between propeller and bottom and the same between keel tip and propeller we are talking about 50 cm / 20" minimum depth for the keel.
Arto
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