Design for DSS-Foil Assist for Keelboats

Dss 100

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Riiiight.......

 

If you are thinking of buying one, you might include a penalty clause in the contract...righting moment, displacement.

Id love to see how they achieve a 33 ton , dual purpose , 30m yacht . I sail a similar boat and she has 3 tons of liquid, 1 ton of batteries, 1 ton of ground tackle and handling gear............ plus all the associated systems. 55 tons

off course they could use lightweight composite anchors, chain , feed the yacht with a couple jerry cans then pee pee over the side when they feel the urge

 

Infinity 36(flying the Quad) in lots of wind:
https://www.facebook.com/pages/Dyna...8432981&set=vb.332237286863323&type=2&theater

 

Dss

Congratulations to Hugh Welbourn and the Wild Oats Team for winning the Sydney-Hobart 2013 using DSS! This was the most significant ocean race yet won by a DSS equipped boat.
As mentioned earlier, a new 100 footer is under construction now designed from scratch for DSS.....
The era of lifting foils on keelboats is just begining!

 

Dss

This is from the book: "The making of Quant-Boats by Michael Aeppli" an extraodinary book describing the beginings of the Quant 28 and 30.
The quote below is a good description of DSS.
posted with permission of Michael Aeppli

The Quant-Sportsboats have a Two-Boat characteristic thanks to DSS:

Boat 1 with retracted foils is very slender, very light, and has plenty of sail surface for light to medium winds. The foil eliminates 60% of the keel ballast. This makes the Q30 extremely fast for its length. Closehauled and running: The superior, lively boat for our lakes.

Boat 2 with extended foils provides a multi-hull feeling from a speed of 9 knots and up. In extreme cases, the foil that rights and lifts the boat allows it to sail nearly 100% faster than comparable conventional boats.

Conclusion: In boat 1, the foil acts indirectly as a "stability insurance" in case the wind stregthens. In boat 2, it acts directly as an "afterburner".

 

DSS Design

Excerpt from Press Release posted in its entirety in the SH 2013 thread: ( http://www.boatdesign.net/forums/sailboats/sydney-hobart-2013-a-48695-11.html post 157)

Wild Oats XI is the one of the latest to be fitted with a DSS foil, however Infiniti Yachts have several Welbourn designs that have been created specifically to harness the potential of the foil. Rather than gaining righting moment from traditional features such as keel bulb weight or draft or waterline beam, the Infiniti Yachts are typically lighter and more slender than many other designs, deriving a greater portion of their righting moment from the DSS foil. This is a highly potent combination providing blistering pace off the wind in anything above light to moderate conditions and a fine, low drag hull in light conditions when the DSS foil is simply retracted into the hull. Upwind the DSS foil produces less righting moment but decreases pitching and heeling, resulting in better performance and more comfort.

The Infiniti 100R for example weighs just over 20 tonnes making her the world’s lightest 100ft offshore racing monohull, capable of covering more than 700 miles/day. All the Infiniti Yacht designs benefit from DSS and its significant improvement in performance and comfort.

“It is great to see Wild Oats XI perform so well and this gives us even greater confidence that the Infiniti 100R*, which is lighter and has much more optimised DSS foils, will perform as we expect and will deliver our clients something truly spectacular and unique,” said Infiniti Yachts’ Gordon Kay.* the new 100 footer

Video about the Infinity 100R, with sailing shots of the 36DSS :
http://www.youtube.com/watch?v=e65rlPX3KP4

 

Doug in case you had not noticed, press releases ALWAYS are very positive about their products