sail-world.com
 
 
News Home Cruising Photo Gallery Video Gallery
Sail-World.com : Rod Davis: Rethinking the Current Tactics
Rod Davis: Rethinking the Current Tactics

'Ben Ainslie Racing heads for the shore - out of the current, maybe - but not the place to be.'    © Jon Nash / J.P.Morgan BAR    Click Here to view large photo

Professional sailing coach, Olympic Gold and Silver medalist and long time America's Cup crew and skipper, Rod Davis gives his insights on the effect of current on catamarans, and the new tactics, in San Francisco.

Rod Davis on the coaching job with the New Zealand Olympic Team in Qingdao, 2008 -  Richard Gladwell   Click Here to view large photo
We are always learning in this new Cat world.

You have to think a bit more laterally when comes to racing high-speed boats like cats, particularly in current. Be it San Francisco’s America’s Cup course, or anywhere else that you try to play the current.

A few quick facts: In your 50 foot mono hull, you sail up wind at say 8 knots. If the current is 2 knots that means current is about 25% of total speed. The new Cats will sail up wind at, about 18 knots, a 2 knot the current is about 10% of the boat speed.

That is two and half times different, and is a very big deal.

When you play the shore short by tacking into the shallow water where the current is weaker, you can make big gains in your monohull. The wind shifts are a secondary consideration to getting that 25% boost in performance.

With the cat it is only 10%, so balance between current and shifts enters a different equation. On top of that, a monohull loses about a boat length in a tack.

A good tack in the cat costs you four boat lengths in smooth water, and more in waves. That's a big part of the new cat equation too. You can’t afford to short tack up shore.

The easy conclusion - no short tacking up a shore for current.

Ahhhhh, not so fast. You don’t abandon the current all together; just the current has a factor, given the new situation we are in at San Francisco sailing catamarans.

There is a mind twister: Downwind in some conditions at cat will go two knots faster with just a knot more wind speed. So, in those conditions, you would sail out into adverse current of a knot, increasing the winds speed by a knot, and boat speed by two knots, to get to the finish faster........

That's something you never purposely do in a normal boat.

Strange but true. Still learning.

Rod


When racing on courses close to shore, with current, the tactics are different for catamarans than monohulls -  Alice Gladwell   Click Here to view large photo


by Rod Davis

  

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

http://www.sail-world.com/index.cfm?nid=101390

11:48 AM Sun 26 Aug 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 Aug 2012  America's Cup World Series San Francisco a success
27 Aug 2012  ACWS San Francisco – Challenging week for Team BAR
27 Aug 2012  ACWS San Francisco - Images of Artemis Racing by Sander van der Borch
27 Aug 2012  America's Cup World Series San Francisco - Oracle Team USA double
27 Aug 2012  America's Cup: Reality check for Emirates Team NZ in San Francisco
27 Aug 2012  America's Cup World Series - Perfect day on San Francisco Bay
27 Aug 2012  America's Cup World Series San Francisco - Energy Team 4th overall
27 Aug 2012  Fisher's View: Day 5 ACWS San Francisco - Seriously speedy Sunday
27 Aug 2012  America's Cup: Louis Vuitton Cup will be stunning - Yves Carcelle
27 Aug 2012  America’s Cup World Series San Francisco - Team BAR on Day 4
MORE STORIES ...






News - USA and the World

America's Cup: Five Challengers sign-on for 35th Match by Richard Gladwell/Sail-World.com/nz,




















AWT Quatro Desert Showdown at Punta San Carlos by American Windsurfing Tour,
















America's Cup: Rod Davis - Time for a change after ten years with team *Feature by Richard Gladwell/Sail-World.com/nz,








Maxi yacht rendezvous this September in Sardinia by International Maxi Association,




















America's Cup: Team NZ wish Davis well with new team *Feature by Richard Gladwell, Sail-world.com/nz,


Fisher's View: Sailing perfection at Hamilton Island- Day 3
Roble and Wilson still number one match racers in the U.S.
2014 Formula Kite World Championship Day 1
IFDS World Championship - Day 1 images by Jude Robertson
Volvo Ocean Race: Forget the f-word - Team SCA profiled
52 Super Series - Fleet grows, 2015 dates revealed
420 and 470 Junior Europeans - Teams from 9 nations on the podium
IFDS Worlds - Former president presented with ISAF awards medal
Nanjing Youth Olympic Games - Improvements aplenty in Byte CII fleets
America's Cup: New Zealand loses top coach to Artemis Racing
Volvo Ocean Race 2014-15 CEO Knut Frostad talks (Part I) *Feature
Sevenstar Round Britain and Ireland Race Day 9 - Swish on record pace
2014 CORK Olympic Classes Regatta - Day 3
2014 Nanjing Youth Olympic Games - Day 2
2014 IFDS World Championship: Opening Ceremony images
Opera House Cup - Images by Ingrid Abery
Teams descend upon Cowes for inaugural J/111 World Championships
Hamilton Island Race Week: Everywhere there's smiley people
IFDS World Championships - US Paralympic hopefuls ready for racing
Sopot Match Race - Poland's Tour debut deemed a triumph
Vineyard Race celebrates 80th running of the East Coast classic   
Nanjing Youth Olympic Games: Young sailors begin racing on Lake Jinniu   
AWT Quatro Desert Showdown - Victory for Morgan Noireaux   
Sevenstar Round Britain and Ireland Race - Day 8: Test of endurance   
Bart's Bash: Over 2300 entered from 588 yacht clubs - Join here   
Halifax ready to welcome the world at 2014 IFDS World Championships   
RC44 World Championship title to Bronenosec + Video   
Audi Hamilton Island Race Week: Day 2 Images by Crosbie Lorimer   
IFDS Worlds - Gary Jobson to attend opening ceremonies   
Melges 32 U.S. National Championship - Dalton DeVos crowned champion   
2014 Nanjing Youth Olympic Games trailer   
2014 Chicago Grand Slam - Canfield wins   
Round Britain and Ireland Race - Varuna takes overall lead   
Audi Hamilton Island Race Week; Crosbie Lorimer Day 1 Images   
Fisher's View: Hamilton Island Race Week - Day 1 - Stayin' Alive   
CORK Olympic Classes Regatta 2014 - Day one   
Youth Olympics: practice over, athletes welcomed, time for YOG sailing   
Round Britain and Ireland Race - Record for Artemis-Team Endeavour   
2014 Melges 32 U.S. National Championship - Day 2   
Sevenstar Round Britain and Ireland: Artemis sets fourth course record   


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 WAS US
LocalAds   DE  ES  FR  IT