VIDEO: America’s Cup boat concept unveiled

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The AC75 concept for the 36th America’s Cup was revealed last week.

The AC75 concept for the 36th America’s Cup was revealed last week.

The boat concept for the 36th America’s Cup — a 75-foot foiling monohull racing yacht — has been revealed.

The AC75 was chosen by the Emirates Team New Zealand and Luna Rossa design teams, which spent four months evaluating monohull concepts.

“We are really proud to present the concept of the AC75 today,” said Emirates Team New Zealand CEO Grant Dalton in a Nov. 20 statement. “It has been a phenomenal effort by Dan and the guys, together with Luna Rossa design team, and there is a lot of excitement building around the boat in the development and getting to this point.”

The return to a monohull design was “a fundamental condition” for Luna Rossa to be involved again in the America’s Cup, said Patrizio Bertelli, chairman of the Luna Rossa Challenge.

“This is not a return to the past, but rather a step towards the future: the concept of the new AC75 Class, which Emirates Team New Zealand and Luna Rossa design teams have developed together, will open new horizons for racing yachts, which, in the future, may also extend to cruising,” Bertelli said.

The announcement said the AC75 can right itself in the event of a capsize because it uses twin canting T-foils, ballasted to provide righting-moment when sailing and roll stability at low speed.

The normal sailing mode of the AC75 sees the leeward foil lowered to provide lift and enable foiling, with the windward foil raised out of the water to maximize the lever arm of the ballast and reduce drag. In pre-starts and through maneuvers, both foils can be lowered to provide extra lift and roll control, also useful in rough sea conditions.

The normal sailing mode of the AC75 sees the leeward foil lowered to provide lift and enable foiling, with the windward foil raised out of the water to maximize the lever arm of the ballast and reduce drag. In pre-starts and through maneuvers, both foils can be lowered to provide extra lift and roll control, also useful in rough sea conditions.

This video shows how the boat should function.

“Our analysis of the performance of the foiling monohulls tells us that once the boat is up and foiling, the boat has the potential to be faster than an AC50 both upwind and downwind,” said Dalton.

Practical aspects of the boat were taken into consideration — for example, both foils are canted right under the hull to provide natural roll stability and to allow the boat to fit into a standard marina berth.

An underlying principle has been to provide affordable and sustainable technology that will trickle down to other sailing classes and yachts. Although recent multihulls have benefited from rigid wing sails, the technology has not transferred to other sailing classes.

In tandem with the innovations of the foiling system, Emirates Team New Zealand and Luna Rossa are investigating possible innovations for the AC75's rig, with the requirement that the rig need not be craned in and out each day. The research work is ongoing as different concepts are evaluated; details will be released with the AC75 Class Rule before March 31.

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