The latest version:  Mark IV

 

Omer Wing-Sail mark IV is based on a rotating A frame mast, that supports the wing in both sides, having an accurate wing profile as well as high moment of inertia. 

 

Mark IV has a shorter mast, V shape boom, optional gennaker, square top main sails, and the choice between standard tracks and cars (cruising version) or luff lines (performance version).

The wing area is 69m², which is about 85% of the standard Elan 37 sails area.