sail-world.com
 
 
News Home Cruising Photo Gallery Video Gallery
Sail-World.com : America's Cup: AC72 a triple leap of faith - Luca Devoti
America's Cup: AC72 a triple leap of faith - Luca Devoti

'32nd Louis Vuitton Cup RR2. BMW Oracle Racing vs +39'    BMW Oracle Racing © Photo Gilles Martin-Raget    Click Here to view large photo

Luca Devoti has begun contributing to both Farevela.net and FareVela, Italy’s biggest sailing media.

The Italian Olympic sailor, silver medalist in the Finn in the Sydney 2000 Olympics, skipper of +39 in the 2007 America’s Cup, founder of the Devoti Sailing boatyard that builds Finn, Melges 24 and D-One, and current coach of the Italian Sailing Federation at the Finn class, will talk about various topics related to competitive sailing, fruit of his long experience and his wide network of international contacts at all levels. A well-informed person of the facts, as well as a careful observer of what is taking place in the sport of sailing.

In this first installment, Devoti gives a critical view on the current America’s Cup and, in particular, the AC72 yacht which he considers to be an example of the 'complete lack of practicality' that, in his opinion, marks the 34th America’s Cup. Devoti has first-hand experience on the issue, having been the Sports Director of Green Comm Racing, the now defunct challenger for the 34th America’s Cup:

The problem with the AC72 wings is mainly logistical, the ability to manage and handle a piece of equipment that weighs many kilos in order to make it operate in the best way possible within the complexity of configurations that will provide the aerodynamic advantages for the best performance. All teams have positioned themselves towards a three-element wing, with three modules and a central part, the same path the Little America’s Cup had already taken.

The difficulty lies in making it work and turn, by changing its shape while using the least energy possible. We must, therefore, understand how the wing works. In the AC45 the key lies in the use of the winch that is connected to the wing and serves as sheet and runner, making the windward hull fly at an ideal height, neither too low nor too high. This is in fact obtained, especially when the wind is unstable in intensity and direction, by continuously trimming the wing in and out. On the AC45 this is done with a load that is manageable by one person with a winch, although with great difficulty. We have seen that the ideal wing trimmer is a great sailor but is also in great physical condition, especially when the wind picks up.

The load on the AC72 wing, in this sense, will be much greater, I don’t want to be wrong but I think it will be around 1,500 kg, and will, therefore, involve different sizes and approaches. We must see whether we succeed. If you remember this was the problem of the challenge of the two monsters in 2010, that is the advantage of Oracle USA 17 over Alinghi 5. Alinghi struggled to stay high and with a certain angle, it was not a problem of quality of the helmsman as much as the difficulty with a conventional sail to keep this ideal setup.

The wing has therefore only a lateral load and still very low compared to the load on the sheet, and in a conventional sail when you ease or tense the sheet, it opens, twists more or closes. This type of work, especially when made with an engine, was perfect … one got there … and inside-outside, inside-outside you trimmed. On the other hand, with a conventional sail, even with the help of an engine, it was very difficult. Therefore, perhaps, we might see wing configurations that don’t seek maximum efficiency, but maximum ease of use.

Given the race course and the venue (the windy bay of San Francisco) a lot of unknowns open up in this project. The wing is so high and in San Francisco with 25 knots of wind and steep and short waves, its dimension becomes critical. It works in theory, when the boat is at speed, because the appendices that will go on the AC72 will not be linear but curved, they will not be at a fixed angle any more but move in and out and could also change the angle of attack. The balance, therefore, is given by the dynamic lift, given by the shape of the bows and the angle of the front foil, however it is clear that if, for any reason, there is no speed, the dynamic element will be missing and the possibility to pitchpole will increase exponentially.

For the rest of this story, in English, click here

For the full version including video, Click here


by Luca Devoti, Vsail.info

  

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

http://www.sail-world.com/index.cfm?nid=96679

4:06 AM Mon 30 Apr 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:

29 Apr 2012  Emirates Team New Zealand on track for 2013 America's Cup
28 Apr 2012  America's Cup - San Francisco makes excitement evident
27 Apr 2012  America's Cup: AC72 regatta offered to New Zealand for summer of 2013
22 Apr 2012  America's Cup Uncovered: Episode 35- Racing gets underway after break
19 Apr 2012  America's Cup: Three teams to train in New Zealand in AC72's in 2013
19 Apr 2012  America's Cup - Oracle Racing heads to New Zealand
18 Apr 2012  America's Cup: Second challenger withdraws, leaves substantial debt
16 Apr 2012  America's Cup World Series: Full Video Replay of Finals Day in Naples
16 Apr 2012  Fisher's View: Day 5 Luna Rossa thrill their America's Cup home fans
16 Apr 2012  AC World Series Naples - Luna Rossa images by Carlo Borlenghi
MORE STORIES ...






News - USA and the World



































Formula Windsurfing Youth and Master Worlds overall by International Windsurfing Association,












Bakewell-White supermaxi designed to take Transpac's Barn Door Trophy *Feature by Richard Gladwell Ssail-World.com/nz,




















Foiling Week - Moth Class Italian Open Championship Day 2
America's Cup: Luna Rossa foiling in AC45s at their Italian base
Star World Championship - Germans claim dramatic win in Malcesine
PWA Awaza World Cup - Down to the wire in Turkmenistan
Route Halifax Saint-Pierre - Off to France!
Nacra 17 Europeans - La Grande Motte back in Olympic classes arena
Stena Match Cup Sweden - Hansen hat trick in Marstrand + Video
Route Halifax Saint-Pierre Race keeps an eye on Arthur
World Match Racing Tour: See the Finals replay at the Stena Match Cup
Newport International Boat Show unveils exciting 'At The Helm' Program
Stena Match Cup Sweden - First blood to Hansen over Canfield + Video
Star World Championship - Americans claim race win in Malcesine
PWA Awaza World Cup - Weather halts action on day 4
Clipper Race - Henri Lloyd wins OneDLL Cup into Den Helder
Clipper Race - Close match racing in closing stages of the OneDLL Cup
Volvo Ocean Race: Spanish play catch-up with under 100 days to go
World Match Racing Tour: Catch the live action at the Stena Match Cup
Finn Junior Worlds - Battle for the Jorge Bruder Silver Cup
Mobiles drive traffic - 72% increase in Sail-World.com page view *Feature
British Open Dragon Championship finale at Royal Lymington preview
2014 Cape Panwa Hotel Phuket Raceweek - Phuket is ready to host   
PWA Awaza World Cup - Valerie Ghibaudo hits back on day 3   
Star World Championship - Hard fought win on day 4 + Video   
Stena Match Cup Sweden - Action-packed match racing + Video   
Oceans of Hope yacht arrives in Portsmouth   
Bell's Beer Bayview Mackinac Race - Registration details   
RORC Transatlantic Race - Polishing up the silver   
Vic-Maui International Yacht Race - First start to lead off busy day   
Anna Tunnicliffe competing at the CrossFit Mid-Atlantics + Video   
18ft Skiff Europeans: Winning days at Lake Garda   
Clipper Race - Choppy conditions as fleet closes in on Den Helder   
Lightning Youth World Championship - Final day   
2014 Star Class World Championship - Day 3   
America's Cup: Dean Barker interviewed on the current state of the Cup   
PWA Awaza World Cup - Delphine Cousin draws first blood   
Stena Match Cup Sweden - On a roll in Marstrand + Video   
Star World Championship - Frustrating day 3 rocks the fleet   
Maxi Yacht Rolex Cup - Rendezvous returns August 31st   
ISAF seeks modern catamaran for future Youth Worlds editions   
470 Junior Worlds - Flawless performances on day 4   


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