Please select your home edition
Edition
Noble Marine 2019 - Leaderboard

America's Cup: Images and video reveal American Magic's novel design approach

by Richard Gladwell/Sail-World.com/nz 14 Sep 16:24 BST 15 September 2019
AC75 - NYYC American Magic caught on the tow for more test sailing on Narragansett Bay, Newport RI © Stephen R Cloutier / PhotoGroup.us

The second AC75 to be launched and first to sail, NYYC American Magic, was caught on camera by several media during a regatta on Narragansett Bay, Newport RI.

Previously just a few shots had leaked on the the web, along with two official shots from the team.

Media at the regatta were given a fly past by the AC75, sailing fast in a 12-14kt breeze and flat water.

The foiling monohull appeared to be very stable a video filed by Mark Mills on Facebook as the AC75 did a run in 12-14kts of breeze, including an attempt at a foiling tack at the end of the run.

The most unusual shots are of the AC75 under tow where her scow-like full shape is revealed - shot from ahead of the boat, rather than astern as in the official sailing shot, released by the team on Wednesday.

The AC75 Class Rule prevents "scow-bows" by setting two maximum beam measurements within the first three metres of the hull - creating a rather unusual bow treatment on NYYC American Magic.

The design approach taken by her design team assisted by design partner Airbus shows a very wide flat hull - even allowing for camera lens distortion. That is quite a different approach to that taken by the Emirates Team New Zealand design team who have opted for a more traditional hull shape, with multi chines, and a bustle running partway down the centre of the hull, producing a distorted underwater shape.

The NYYC American Magic shape is more stable at low speeds but will have more drag because of increased wetted surface. It would seem that the offset for that is to get the boat heeling as much as possible, get her riding on her leeward bilge to reduce wetted surface and induce foiling as quickly as possible.

Shots taken at the American Magic base show the two teams, American Magic and Emirates Team NZ have taken completely different design approaches. While ETNZ's Grant Dalton described their design as "extreme" the design team at NYYC American Magic along with partner Airbus, have also produced what many would consider to be an extreme design approach in their hull. The rigs also will be quite different, with American Magic opting for a conservative rig, while the Kiwis are expected to unveil a deck sweeper mainsail, without a convention main boom and sheeting.

One of intriguing possibility of the beamy flat hullshape is whether the boat will be able to benefit from ground effect aerodynamics - a question best answered by the Airbus team - but if present it does reduce induced and creates lift, as the boat/plane effectively rides its own air bubble across the water. In fighter planes the effect cuts in when the aircraft is one wingspan above the ground or water.

For more see facebook.com/blockisland

This second video shows the AC75 in steady flight, and at the end a foiling gybe is attempted, which ends in a soft landing at the exit, after the old foil wing is raised.

Italian sailing site Farevela has published a series of 16 shots of NYYC American Magic after she was hauled from the water which can be viewed by clicking here

The most significant point of difference between the foils on the two AC75's launched to date, aside from the differences in hull design, is the approach with the foil fairing and foil wing. While the carbon foil arm is one design and a supplied part, the teams are free to add whatever fairing they wish. With the foil wing, it must fit within six-sided template outline, otherwise it is free design. The foil wing is allowed to weigh up to 740kg, and when not being used as a foil is canted to windward to provide righting moment.

Under the current version of the Protocol which governs the America's Cup there is virtually no restriction on photography, the detail revealed in the American Magic images is less than revealed by Emirates Team New Zealand at their launch a week earlier, and a spy boat complete with photographer said to be from Italian Challenger Luna Rossa was in close attendance when ETNZ were Te Aihe was sea trialing last Wednesday.

Related Articles

America's Cup: Builders to get first look at AC75
This week 40 boat builders will venture out on to the Hauraki Gulf to watch their exceptional boat America's Cup defenders Emirates Team New Zealand have done things differently by building their own boats for the first time, and so far, it's paying off Posted on 9 Dec
America's Cup: Burling and Tuke back on the AC75
The day after winning their fifth World 49er title, Burling and Tuke were back on the AC75 The day after winning their fifth World 49er Championship in Auckland, Peter Burling and Blair Tuke were out on the Waitemata for an early morning training session on the AC75, Te Aihe. Posted on 9 Dec
America's Cup World Series schedule becomes clear
The America's Cup Challenger of Record, has published but not spelt out details of the World Series The America's Cup organisers have followed the line of the previous trophy holder by meeting a publication deadline without publicly revealing any specifics after an 11th hour negotiation between Cup organisers, venues, teams and sponsors. Posted on 30 Nov
America's Cup: Plenty of sheep in The Paddock
Unanswered questions on an upper end wind limit for the 36th America's Cup got a partial response UPDATE Two new videos added shot by Ivan Balaja from his coach boat. The unanswered questions on an upper end wind limit for the 36th America's Cup got a partial response from the Defender in a training session east of Browns Island, today. Posted on 22 Nov
America's Cup: Te Aihe heads out to The Paddock
Emirates Team NZ's AC75, Te Aihe was back on the Waitemata Harbour for the second day in a row Emirates Team NZ's AC75, Te Aihe was back on the Waitemata Harbour for the second day in a row, after spending almost two weeks in the shed. Posted on 20 Nov
Te Aihe plays with the 49ers ahead of the Worlds
Light winds weren't that co-operative with Emirates Team New Zealand's Te Aihe on Tuesday Light winds weren't that co-operative with Emirates Team New Zealand's Te Aihe on Tuesday when she ventured out on the Waitemata for the first time in almost two weeks. Posted on 20 Nov
America's Cup: American Magic's foiling tack video
The New York Yacht Club's Challenger for the America's Cup has released a short video The New York Yacht Club's Challenger for the America's Cup has released a short video shot in Newport, showing that they too, can do a foiling tack without getting wet Posted on 19 Nov
America's Cup: Luna Rossa's AC75 foiling - Video
First video released by Luna Rossa Prada Pirelli of their AC75 foiling in Cagliari, Sardinia First video released by Luna Rossa Prada Pirelli of their AC75 foiling in Cagliari, Sardinia. Posted on 15 Nov
America's Cup: The Agony and Ecstacy
Like all professional sports, race results in the America's Cup mean more than just bragging rights “A little bit of boat speed makes you famous” once said an America's Cup skipper. The unsaid flip side is that a lack of it, will relegate you to obscurity. Posted on 15 Nov
Burling and Tuke announce new ocean ambition
Olympic champions Peter Burling and Blair Tuke have announced the establishment of Live Ocean Olympic champions Peter Burling and Blair Tuke have announced the establishment of Live Ocean, a registered New Zealand charity with a focus on ocean conservation. Burling and Tuke say they're excited about what may be their biggest challenge of all. Posted on 10 Nov