multi sail smaller sails for lower c/g thrust sweetspot... especialiy on land yatchs and wind bikes and water cattatmarangs ect . skeatesy...
a louvered wing ground effect craft with a tail and ailerons http://www.youtube.com/watch?v=d2yLEIOsE6I d2yLEIOsE6I...
a louvered wing ground effect craft would be very efficient http://www.freeimagehosting.net/image.php?664e364ea4.jpg