sail-world.com
 
 
News Home Cruising Photo Gallery Video Gallery
Sail-World.com : America's Cup: Oracle Team USA show off hull lifting foil developments
America's Cup: Oracle Team USA show off hull lifting foil developments

'Oracle Team USA shows a hoisted L-dagger board while trialing in San Francisco on the AC45’s'    Guilain Grenier Oracle Team USA©    Click Here to view large photo

Oracle Team USA have released their first images of their L-Board daggerboards and T foil rudders, which have been used in a testing session in San Francisco.

The foils have been fitted into one of the four AC45's used by Oracle Team USA, the Defender of the America's Cup. The use of the foils is not permitted in the America's Cup World Series, but do provide an indicator as to what is likely to be seen on the team's first AC72, scheduled for launch in July 2012.

The effect of the foils is very dramatic, lifting both hulls completely clear of the water, increasing stability and reducing drag - both of which will substantially increase speed, providing the 'flying' can be controlled.

The function of both foils is obviously to generate lift, the L shaped foil is reasonably sizeable extending to at least half the beam of the hull.

The force on the daggerboards seems to be sufficient to cause the leeward one to bend under load.

Normally the L-daggerboard would provide the majority of the vertical lift and the rudder would provided a little lift but would be controlling the trimming angle.

The control mechanism to control the foiling/flight is not apparent. There is no wand as used in the foiling moths, and it may be that the angle is computer controlled. Certainly the crew don't look too pre-occupied with maintaining flight, and with three sails set in one of the shots, and at least one crew member on a winch, would not leave too many spare hands.

The purpose of the bulb on the base of the wingsail is unknown. It is maybe a more sophisticated wing sail control.

Remember to click on the expansion option in each shot to see the full screen view.

Also shown is a shot taken four months earlier, from www.xssailing.com on February 24 2012. It shows the larger size of the L-daggerboard (at that stage).

In a later statement Oracle Team USA commented:

During last week’s training session in San Francisco, Oracle Team USA sailors were learning to fly on hydrofoils. An L-shaped daggerboard and T-shaped rudders were fitted to one of the team’s AC45s and the platform took flight.

Foiling is not a new phenomenon. Many high-speed ferries rely on hydrofoils for a smooth ride for their passengers. In sailing, the Moth class has experimented with foils since the early 1970s, about the same time that designers such as Rod Macalpine-Downey were experimenting with foils at Weymouth Speed Week. In 2009 the 60-foot foiling trimaran l’Hydroptere set the record at 51.36 knots.

Foils help reduce draft and increase speed. They are a very cost efficient way to gain performance. You can research them extensively in the computer before you build them, and they are small scale, compared with a wing. The foil project is a continuation of one started on USA 17, the team’s 90-foot trimaran that won the 2010 America’s Cup.

Oracle Team USA shows a hoisted L-dagger board, to windward, with the leeward hull fully supported and flying, while trialing in San Francisco on the AC45’s -  Guilain Grenier Oracle Team USA©   Click Here to view large photo

Oracle Team USA shows a hoisted L-dagger board, to windward, with the leeward hull fully supported and flying, while trialing in San Francisco on the AC45’s. The T-foil rudder is also evident, just clear of the water on the rear of the windward wull -  Guilain Grenier Oracle Team USA©   Click Here to view large photo

Oracle Team USA shows a hoisted L-dagger board, to windward, with the leeward hull fully supported and flying, while trialing in San Francisco on the AC45’s -  Guilain Grenier Oracle Team USA©   Click Here to view large photo

Big wave surfer, Laird Hamilton, rides the AC45 with Jimmy Spithill and Oracle Team USA in San Francisco -  Guilain Grenier Oracle Team USA©   Click Here to view large photo

Oracle Team USA trialling L-daggerboards in February 2012 by www.xssailing.com -    


by Richard Gladwell

  

Click on the FB Like link to post this story to your FB wall

http://www.sail-world.com/index.cfm?nid=98900

11:35 PM Sun 24 Jun 2012GMT


Click here for printer friendly version
Click here to send us feedback or comments about this story.

Click for further information on
2013 America's Cup

Related News Stories:

25 Jun 2012  America's Cup: More Images from Newport
24 Jun 2012  America's Cup: Images from Newport
24 Jun 2012  America's Cup: Great to be back at Newport - Rod Davis
22 Jun 2012  Volvo Ocean Race: Camper - the ride so far + Video
21 Jun 2012  America's Cup: Fire blazes for several hours on Cup construction site
21 Jun 2012  ACWS - Training and statement on Pier 29 fire
19 Jun 2012  America's Cup: Fourth Challenger pays Entry Fee for Louis Vuitton Cup
18 Jun 2012  America's Cup 2013 - African Diaspora Maritime sues Golden Gate YC
16 Jun 2012  America's Cup: Ray Davies works out the Kinks for Emirates Team NZ
13 Jun 2012  America's Cup: Defender's first AC72 wingsail is delivered
MORE STORIES ...






News - USA and the World









International Moth Worlds: Rashley ahead as Aussies close in by Mark Jardine / YachtsandYachting.com,


















International Moth Worlds - Mothballed on day 4 + Video by Mark Jardine / YachtsandYachting.com,




Gladwell's Line: A change of direction needed in the America's Cup *Feature by Richard Gladwell/Sail-World.com/nz,
























Anna Tunnicliffe set to compete at the CrossFit Games by Anna Tunnicliffe, Pittsburgh, PA












U.S. Junior Women’s Singlehanded Championship - Sophia Reineke wins
BIC Techno 293 Worlds 2014 - Day 0 Opening
Fuerteventura World Cup - Slalom action highlights day 2
2014 Governor's Cup - Sam Gilmour of RFBYC victorious again
Farr 40 West Coast Champ - Skipper Alberto Rossi leads Enfant Terrible
Flying Dutchman World Championships - Magyars are the Masters
Final day shakes up standings at Cape Panwa Hotel Phuket Raceweek
2014 -15 Volvo Ocean Race: Team Alvimedica pushing towards Southampton
NYYC Race Week - Saving the best for last
VX One North American Championship - Chris Alexander commands
2014 Cape Panwa Hotel Phuket Raceweek - Waiting game on Day 3
International Moth Worlds: Thunderstorms delay racing on Day 1
Fuerteventura World Cup - Impressive tricks on day 1
2014 Governor's Cup - Two former winners in the finals
America's Cup: Iain Murray explains reasons for Australian withdrawal *Feature
Wilson and Roble remain number one match racers in U.S.
2014 ISAF Youth Match Racing World Championship - Set to start
PWA Pozo World Cup - Moreno twins dominate home spot
ISAF Youth Worlds - Record breaking regatta in Tavira + Video
Melges 32 European Championship - Robertissima remains out front
Farr 40 West Coast Championship - Italians take one-point lead   
Melges 32 European Championship - Day 3 images by Carlo Borlenghi   
New York Yacht Club Race Week - Marstrom 32 fleet off to anxious start   
Melges 32 European Championship - Day 3 images by Max Ranchi   
CYC Race to Mackinac - Cruising fleet sets sail in 106th edition   
Team Alvimedica getting a touchup   
PWA Pozo World Cup - Plenty of drama on day 5   
ISAF Youth Sailing World Championship - Day 5 Videos   
NYYC Race Week - High performance classes put on shoreside show   
2014 Pacific Cup - 'Invisible Hand' the first boat to finish   
Clipper Round the World Yacht Race - B.C.'s Eric Holden skippers wins   
America's Cup: Updates on Team Australia withdraw   
J/70 North American titles - Brian Keane moves to top of leaderboard   
2016-2017 America's Cup - Team Australia withdraws   
VX One North American Championship - Chris Alexander takes charge   
America's Cup: Team NZ disappointed, but on track after Australians go   
America's Cup: Hamilton Island decides not to proceed with Challenge.   
America's Cup: Challenger of Record withdraws from Regatta   
WWA Wakeboard National Championships head to Waco   
Farr 40 West Coast Championship - Day 2   


For this week's complete news stories select    Last 7 Days
   Search All News
For last month's complete news stories select    Last 30 Days
   Archive News







Sail-World.com  


















Switch Default Region to:

Social Media

Asia

Australia

Canada

Europe

New Zealand

United Kingdom


http://www.sail-world.com/event_images/image/Twitter_logo_small.png http://www.sail-world.com/event_images/image/FaceBook-icon.png  http://www.sail-world.com/event_images/image/RSS-Icon.png

United States

Cruising Northern

Cruising Southern

MarineBusiness World

PowerBoat World

FishingBoating World

 

Contact

Commercial

News

Search

Contact Us

Advertisers Information

Submit news/events

Search Stories/Text

Feedback

Advertisers Directory

Newsletter Archive

Photo Gallery

 

Banner Advertising Details

Newsletter Subscribe

Video Gallery

Policies

 

 

 

Privacy Policy

 

 


Cookie Policy

 

 



This site and its contents are © Copyright TetraMedia and/or the original author, photographer etc. All Rights Reserved.  Photographs are copyright by law.  If you wish to use or buy a photograph contact the photographer directly.
XLXL NEW US
LocalAds   DE  ES  FR  IT