sail-world.com
 
 
News Home Video Gallery Photo 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





























America's Cup Book Review: Winging It - Oracle Team USA's comeback *Feature by Richard Gladwell Sail-World.com/nz,




Rolex China Sea Race 2014 - nip and tuck for IRC honours by RHKYC and Guy Nowell, Sail-World Asia, Hong Kong


























HUD Vision: An interview with Afterguard Marine’s Alex Moret *Feature by David Schmidt, Sail-World USA Editor, Seattle








ISAF Match Race Rankings for 16 April 2014
ISAF Sailing World Cup Hyeres – World’s best to race on French Riviera
Rolex China Sea Race – Fleet off to a clean start
America's Cup: Expected de Ridder penalty should be reduced *Feature
World Youth Sailing Week – Second edition officially presented + Video
Rolex China Sea Race - Sailing classic returns
Les Voiles de St Barth – Fired up for battle
CNN Mainsail Down Under for the 75th JJ Giltinan Trophy - 18ft skiffs
Volvo Ocean Race: North Sails on outfitting the Volvo 65
Image gallery: James Cook High's Royal encounter on Steinlager 2 *Feature
Volvo Ocean Race - Maersk Line named shipping partner
Congressional Cup - Victory for Taylor Canfield and crew
SSV Oliver Hazard Perry joins America's Tall Ship fleet + Video
2014 Halifax – Saint-Pierre Ocean Race
Oyster Regatta Antigua - Glorious conditions prevail on final day
WWA Pro Card Qualifier - Pro Cards earned at Freedom Wake Park
Christmas Caribbean Rally - Top class sailors to compete
Earth Day boater tips
Anna Tunnicliffe - from CrossFit to Extreme 40's
Charleston Race Week - Photos by Chris Howell
Image Gallery: Stratis SL33 flies on the Waitemata   
Audi Melges 20- Sperry Topsider Charleston Race Week - Light final day   
Clipper Round the World Yacht Race - PSP Logistics prepares for USA   
ISAF Sailing World Cup Hyères - Crème of the crop to compete   
Congressional Cup: Luna Rossa makes podium in first event   
Int 14 World Championships 2015 launch new event website   
International Optimist Regatta Clinic and Team Race - Register now!   
Congressional Cup: World top rankers finish that way in Long Beach   
Sperry Top-Sider Charleston Race Week Day 3 finale   
America's Cup: Gino Morrelli outlines the new AC62 design   
Doyle Sails New Zealand signs Andrew Brown as One Design Manager   
America's Cup: Dean Barker's Blog - A sail with the Duke and Duchess *Feature   
29er World Youth Sailing Week Easter regatta - Day 1 and 2 overall   
C Thomas Clagett Jr Memorial Clinic/Regatta - Entries start to roll in   
50th Congressional Cup: See the delayed coverage and media conferences   
Clipper Race 10 Day 27: Closing stages - Qingdao to San Francisco   
Canfield, Williams, Bruni, Swinton in Congressional Cup final four   
Sperry Top-Sider Charleston Race Week - Day 2   
Audi Melges 20 Charleston Race Week - Perfect conditions in Charleston   
Oyster Regatta Antigua - Full on ocean conditions for day 3   


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.
X6XL NEW US