Latest version with two sails of 1.5m per 3m each, 5m lift of stroke up and down, a revolving mast of 9m total height anchored by 3 ropes. It functions without a rudder.
An early version with a massive frame in aluminium with mounted rudders, a trolley in stainless steel
Rudders mounted on the mast in an earlier version
The final aluminium trolley with all the necessary mechanics