Hi
Dear Joe , qualities of the three wheel diamond shape are unquestionable , cannot argue about that . Mine is different approach .
Gizmo , thanks for your drawings (looks like space ship..) and photo was more than a thousand words...OK , agree , weight is problem n° 1 (mark it) . Yes , in fact , in my four wheel yacht projection a land base is included ; multihull shape is first idea glance comes to me and move across the yacht while tacking the only possible way I'm ready to immagine...speed of tacking should be related to area ground to do it then enough time to move across , don't you think ?
OK , here is part of my thoughts .
The four wheels yacht I'm thinking of is to be used in a desert , a spot in SouthAmerica , beside the Pacific Ocean . 3 hundred days a year of at least 18 knots of constant winds spot . The desert I'm talking about is not as flat as the ideal spots land sailing actually use , it is more like hips , holes , some peebles (mainly small) , maybe dunes and hills , some huge hills...and also flat , flat extentions as well . Don't think motocross , but first thing it made me think was suspension fact of the thing . Be back later at this argument .
Rudder : I belive the rudder can be fixed in the rear axle being hold and managed by the stern hand , meaning , drive by moving the stern of the craft first , as in a boat...
Plan drawings (my side..) in the following days . Meantime feed back please

Gherard