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Old 05-04-2013
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Re: how to make a marconi sail

Hey my first post so go easy on me.
The sail has to look like an airplane wing if you want marconi effect.
You need lateral resistance also preferably in the shape of a foil, to get the same kind of lift under water. Sails up top high pressure on the front side, low on the loured side, therefor fast flow adhering to the back side of the sail, causing marconi basically sucking forward and wind ward. Under water with pressure on the leeward and low on windward. Same but opposite. Again sucking you forward and if well built to windward. So basically you have an airplane wing turned on it side on the top of the boat, and one at the bottom of the boat. (airplane on it's side) Thrust is caused by the pressure and the lateral resistance, that's the fuel. the "lift" is cause by the marconni effect.

Basically I think of it as an airplane turned 90 degrees
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Old 05-05-2013
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Re: how to make a marconi sail

What he needs for his kayak are called "Leeboards" and consist of rotatable daggerboards on either side of the hull. They rotate up or down. Down for sailing to prevent the boat going sideways (making leeway) and up for shallow water. They can be on a common axle running across the deck of the kayak and should project about a foot below the bottom of the kayak.
What do you use as a rudder?
Leeboards are a common feature on some shoal draft boats (check out the designs of Michalak and Bolger)
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