Please select your home edition
Edition
Vaikobi 2019AUG - Leaderboard 1

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

by Richard Gladwell/Sail-World.com/nz 14 Sep 2019 08:24 PDT 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: Prada Cup Preview - Image Gallery
Here's a look at what the breeze could be for Day 5 of the Final of the Prada Cup Final In 12 months time the Prada Cup, a best of 13 race series may well have been decided. Here's a look at what the breeze could be for Day 5 of the Final of the Prada Cup Final, as Te Kahu sails on Course C. Posted on 20 Feb
America's Cup: Emirates Team NZ staying dry
Emirates Team NZ's test boat was easily performing "dry" tacks and gybes With Peter Burling back on the helm, two days after winning his sixth 49er Worlds, Emirates Team NZ's test boat was easily performing "dry" tacks and gybes. Posted on 19 Feb
America's Cup: Te Aihe heads for Europe
Emirates Team New Zealand's AC75 Te Aihe has set off on her two month voyage to Europe Emirates Team New Zealand's AC75 Te Aihe has set off on her two month voyage to Europe and two America's Cup World Series at Cagliari (Sardinia) in late April and Portsmouth in early June. Posted on 17 Feb
America's Cup: Issues emerge in Match Conditions
It might be Valentine's Day but that didn't stop two America's Cup protagonists having a blunt chat It might be Valentine's Day but there is not too much love lost between Sailing Illustrated's host, Tom Ehman , and Sail-World's NZ Editor, Richard Gladwell as they cover the issues of the day 12 months out from the America's Cup in Auckland. Posted on 16 Feb
America's Cup and Prada Cup issues resolved
The contentious Wind Limits for the 36th America's Cup and Prada Cup have been decided The contentious Wind Limits for the 2021 America's Cup and its preliminary regattas have been decided by Mediation rather than a full Arbitration Panel. As widely tipped they have met halfway between the two windstrengths nominated by the teams Posted on 13 Feb
Emirates Team NZ fans buy gear at Official stores
Emirates Team New Zealand fans show your support - buy the latest range in stores or online As anticipation builds to the 36th America's Cup, get behind and show your support for Emirates Team New Zealand. Buy online from New Zealand or anywhere in the World. Two stores in Auckland - at Auckland Airport and outside the ETNZ Base. Posted on 12 Feb
America's Cup: American Magic nosedive - video
American Magic release video of their test boat doing a spectacular nosedive New York Yacht Club's America's Cup team, American Magic have released a video of their test boat doing a spectacular nosedive while sailing off the team's base in Newport. Posted on 12 Feb
America's Cup: Chasing the Hawk
Images of Emirates Team NZ's test boat training on the Waitemata harbour After a long weekend, Emirates Team New Zealand test boat, Te Kahu, or the hawk, was out sailing for an extended session in the Waitemata Harbour - when the breeze kicked in. Posted on 11 Feb
America's Cup: Shoot-out at the Cagliari Corral
The first shots in the AC75 design battle will take place at the end of the April The first battle for the America's Cup World Series will take place at the end of the April in Cagliari, Sardinia and will be a strong design indicator for the Main Event nine months later. Posted on 5 Feb
America's Cup: Revealing video of ETNZ's AC75
Electric motor supplier Maxon have released an excellent video of Emirates Team New Zealand's AC75 One of the many interesting features of the video comes at the end as the boat sails on starboard tack and the tip of the starboard wing can be seen under the clear water, with a white "jetstream" flowing from the wingtip. Posted on 4 Feb
iSails 2020 - February - FOOTERRS Sailing 2019 - FooterHenri-Lloyd 2020 FOOTER