Team New Zealand have released concept design plans for the giant foiling monohull to be used in the 2021 America's Cup regatta in Auckland.

The design features twin cantilevering T-foils which are ballasted to provide stability. Team NZ say the foils will need to be down for the docking of the boat to provide stability and reduce the width of the docks required.

This comes as Auckland Council and the New Zealand government debate where the America's Cup syndicate bases will be placed on the city's crowded waterfront.

EMIRATES TEAM NEW ZEALAND Team NZ's concept foiling monohull design involves cantilevering T-foils on either side.

Team New Zealand claim the performance models of the giant 75-foot monohull show it has the potential to be faster than the 50-foot catamarans used at this year's America's Cup in Bermuda.

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EMIRATES TEAM NEW ZEALAND Concept plans for the foiling monohulls to contest the next America's Cup.

In normal sailing mode the leeward foil will be in the water to provide lift and the windward foil provides righting assistance. Both foils can be employed for maximum stability in manoeuvres and difficult conditions. It is planned to be self-righting in the event of a capsize.

The boat features an open design hull and large cockpit for the crew at the stern. It can operate a furling Code Zero foresail for light winds.

The AC75 will foil-tack and foil-gybe with only small manoeuvring losses. The designers claim that given the speed and the ease at which the boats can turn the classic pre-starts of the America's Cup are set to make an exciting comeback.

EMIRATES TEAM NEW ZEALAND A cross-section view of the concept design for the 2021 America's Cup yachts.

The concept video released by Team NZ is an animation showing 12 sailors on board as they "sail" a course between Takapuna and Rangitoto Island on Auckland's Waitemata Harbour.

Team New Zealand were due to release their update on the revolutionary boat on November 30, but appear to have fast-tracked that to build excitement as the costly equation of the Auckland bases is weighed up.

Based on their video, the defenders appear to have found a mix of speed and innovation to go with more traditional sailing techniques than were employed in the last two America's Cups when 72-foot and 50-foot catamarans were used.

LAWRENCE SMITH/ STUFF Team NZ boss Grant Dalton believes the 2021 foiling monohulls have the potential to be faster than the cats used in Bermuda.

The full AC75 class rule will be published by March 31 next year and the designers are still working on a number of possible innovations for the AC75's rig, with the requirement that the rig need not be craned in and out each day.

Team New Zealand boss Grant Dalton praised the work of his design team under the leadership of Dan Bernasconi and predicted exciting racing.

"We are really proud to present the concept of the AC75 today. 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," Dalton said in a statement.

EMIRATES TEAM NEW ZEALAND Team NZ and Luna Rossa were the boats depicted in the concept design video.

"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."

"Auckland is in for a highly competitive summer of racing in 2020-2021."

Bernasconi said he and his team had been invigorated by the challenge of producing a state of the art monohull.

EMIRATES TEAM NEW ZEALAND Luna Rossa were the challenger of record for the 2021 America's Cup.

"This design process has been new territory for the team, starting with a clean sheet to develop a class - and we've loved it," he said.

"We wanted to see how far we could push the performance of monohull yachts to create a foiling boat that would be challenging to sail and thrilling to match race. We're really excited about the concept and can't wait to see it on the water.

"We think we have achieved these goals - thanks also to the constructive co-operation of Luna Rossa design team - as well as the more practical detail to consider in terms of cost management and logistics of running the boats."

Italian challenger of record Luna Rossa were heavily involved in the process and chairman Patrizio Bertelli hailed the new concept.

"The choice of a monohull was a fundamental condition for us to be involved again in the America's Cu," he said.

"This is not a return to the past, but rather a step towards the future: the concept of the new AC 75 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.

"It is a modern concept, at the high end of technology and challenging from a sporting point of view, which will deliver competitive and exciting match racing. I would like to thank both design teams for their commitment in achieving, in just four months, the goal which we had established when we challenged".

Max Sirena, the team director of Luna Rossa Challenge who was heavily involved with Team New Zealand in Bermuda, felt the design would test the world's best sailors.

"As a sailor I am very pleased of the concept jointly developed by both design teams. The AC 75 will be an extremely high-performance yacht, challenging to sail, who will require an athletic and very talented crew," he said.

"Every crew member will have a key role both in the manoeuvres and in racing the boat; the tight crossings and the circling in the pre-starts – which are part of the America's Cup tradition – will be back on show, but at significant higher speeds. It is a new concept, and I am sure that its development will bring interesting surprises".