Please select your home edition
Edition
Selden

America's Cup: Images and analysis of INEOS Team UK's first AC75

by Shaun Roster/Richard Gladwell/Sail-World.com/nz 4 Oct 2019 12:15 PDT 5 October 2019
First AC75 launch - INEOS Team UK - Portsmouth, UK - October 4, 2019 © Shaun Roster

The British America's Cup team INEOS Team UK was the last of the four "Super teams" in the 36th America's Cup to launch their AC75, which was splashed on Friday, UK time at Portsmouth.

Photographer Shaun Roster of www.shaunroster.com was on hand to catch these images from the launch.

The British hull shape is the most radical approach seen yet of the four teams, however when broken down into its basic elements it is possible to see past the distracting feature of the bow/nose shape and see the way the other elements may be intended to work.

Probably best described as a design of two halves, the section of the hull forward of the jib tracks is low profile presumably with a focus on aero-drag reduction. The after half is dominated by the crew trenches, and high slab sided topsides

Most obvious feature of the hull shape is the slab sides, without any real attempt to get extra beam as have the other three teams.

(There is no beam measurement on the AC75. The beam is effectively limited by the rule which requires the pivot points for the carbon foil arms to be 2050mm from the centreline giving a total "beam" of 4100mm between the two foil pivot points. The AC75 can be wider, but the pivot points or "Foil Cant Axis" cannot be wider than 4100mm.)

Britannia lacks the dimple of others around the carbon foil arm to permit the foil arm to be fully raised and lowered without making contact with the hull - however she does appear to have a sharper recess to accommodate the upper range of the carbon foil rotation.

While the other three first launches have a sheerline which tapers towards the transom, Britannia has a more complex approach with high topsides running on the outside the the crew trench. Between the two trenches the centre deck slopes into the transom providing an end plate for the decksweeper mainsail, when this is fitted.

The photos of the bow are deceptive, probably caused by lens distortion. Other shots show a more rounded bow quarter, rolling up into the centreline.

The deck layout in the bow area is the most extreme treatment yet with the recessed foredeck approach, presumably to help tidy up airflows around the foot of the jib, rather than just accepting the decksweeper jib solution of the other three teams. The foredeck (forward of the jib tracks) slopes down to about half the expected bow height

The crew cockpits are tight, with two grinding pedestals forward of the helm position and two aft.

The underside of the hull is a similar approach to NYYC American Magic with quite a shallow almost scow like approach, and a very clean uncomplicated shape - unlike Emirates Team New Zealand and Luna Rossa.

The bow is a similar but more radical treatment than NYYC American Magic presumably for improved aerodynamics and to work airflows around the point where the sails meet the deck.

INEOS Team UK have gone for a similar design approach to Emirates Team New Zealand with their wings.

They have opted for a longer, narrower chord wing than the other Italian or New York Challenges. They have a relatively small ballast torpedo/bulb. A feature of the wings are small "spoilers" to keep the flows over the wings aligned and prevent "cross wash" which would reduce the wings effectiveness.

"Britannia" rounds out the first launch cycle with Emirates Team New Zealand and American Magic launching in the first week of September. Luna Rossa Prada Pirelli and INEOS Team UK both launched in the first week of October, almost a month later.

The fourth Challenger, Starts + Stripes Team USA are expected to launch their race boat late this year, and it is expected to be to the same base design as that launched by Emirates Team New Zealand.

Luna Rossa and Britannia are expected to go through the now usual routine of testing foil systems under tow before sailing in a few days time.

Related Articles

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
America's Cup: The Dating Game gets underway
The two teams working out of Cagliari haven't waited too long before their first date. Despite all the rules about teams not being permitted to sail against other AC75 class yachts, the two teams working out of Cagliari don't seem to have waited too long before going out on their first date together. Posted on 4 Feb
America's Cup: US team hits rules headwinds
America's Cup: Embattled US Challenger needs rules exemption to make it to Auckland Stars+Stripes USA are in a battle against time and rules if they are to make the start-line for the 36th America's Cup in Auckland, despite having a trio of top-shelf sponsors, a partly built AC75 to a now proven design and some top US sailing talent. Posted on 2 Feb
Official-Collection-Red.alt1  728x90 BOTTOMMarine Resources 2019 - FooteriSails 2020 - February - FOOTER