It solves the problem of the moment connection to the main beam without resort to exotic materials or construction techniques.
I understand what you mean but I would first like to try to do without it. The simpler the better.
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As for the rig, what I meant to say was that landsailors sail at very low angles due to their speed, for a watersailor you'll probably want a sail with much more shape.
That is absolutely correct, however this only means that the F12 sails must be cut with alot more luff round. Actually the Moth sailboats use a sleeved mainsail very similar to the "Standard" landyachts. This gives me extra assurances that we can succesfully convert the class 5 landyacht rig to a sailboat. Will probably also need to widen the sleeve itself so there is enough room to have the straight mast slide through the curved sleeve.
Wouter Hijink Formula 16 NED 243 (one-off; homebuild) The Netherlands