SkySails is developing, producing and selling an internationally patented wind propulsion system based on large towing kites. Depending on the prevailing wind conditions, a ship’s average annual fuel costs can be reduced by 10 to 35% by using the SkySails-System. Under optimal wind conditions, fuel consumption can temporarily be cut by up to 50%. The SkySails-System consists of three simple main components: A towing kite with rope, a launch and recovery system, and a control system for automatic operation. Instead of a traditional sail fitted to a mast, SkySails uses large towing kites for the propulsion of the ship. Their shape is comparable to that of a paraglider. SkySails easily generate five times more propulsion power per square metre sail area than conventional sail propulsions.