To the people who say its out of control cost.

Cost of ac75. Sails remain the engine of the Americas Cup yacht but with the AC75 the powertrain is more complex than ever. The new AC75 will be a fully flying monohull. The AC75 supplied parts identical for all the teams are the foil arms the foil cant system and the rigging.

Nowadays foils are commonplace but the engineering and sailing techniques needed to get the AC75 to fly are completely different from anything seen before. Topping the 50-knot barrier used to be the preserve of extreme speed record craft and kiteboarders. The leeward skin is more curved and therefore the leech is further forward.

The shape and base laminate of the mast is also controlled by the Class Rule. The competition for the oldest trophy in international sport and dates back to 1851. The AC75 rotating mast is a 265 meter long one-design D shaped section that weighs about 300kg and serves as the leading edge of the double skinned mainsail.

To start with the AC75 is big - 75-feet long and 16-feet wide - but its also light which is crucial because the AC75 is designed to fly. Meanwhile Land Rover BARs bid for the 2017 Americas Cup is expected to cost at least 100 million. For 2021 Team NZs budget will be about half that of Ineos.

It is 590 feet long and cost 600 million to build. Some Cup commentators have criticised the new boat as being too complex and too expensive. Official website of Americas Cup.

Team NZ spent 50m on the 2017 cup in contrast to the hundreds of millions other competitors were reported to have spent he adds. The AC75 mainsail will have a different flying shape from the IACC monohulls sailed from 1992-2007 Americas Cups class and the hard wingsails used on the AC72 and AC50 in 2013 and 2017. One thing is for certain ahead of next summers Bermuda showdown.