The Extreme 40 is a class of sailing catamaran created by TornadoSport and designed by Yves Loday. The boats are 40 feet long and are constructed out of carbon fibre. They have a top speed of about 40 kn and can sail at about 35 kn in 20–25 knots of wind The first extreme 40 was launched in 2005. They were sailed in the Extreme Sailing Series, formerly known as the iShares Cup. Extreme 40s are essentially a scaled-up version of the Tornado sailboat used in The Olympics. Extreme 40s are 40 ft long, have a 23 ft beam, displace 1,250 kg of water, have a mast height of 62 ft and a claimed top speed of 40 kn. The mainsail is 75 sqm and the jib is 25 sqm. The gennaker used for downwind sailing is 110 sqm.