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Old 09-28-2011
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Do you have heard about the DSS (Dynamic Stability System)?

http://dynamicstabilitysystems.com/#/profile

That's a kind of a crazy idea with movable lateral foils. The foils are supposed to give the boat more stability and more righting moment:














Well, that can be a crazy idea but it works. they have tried it on the Wally 94 Magic Carpet (retrofitted) and the results confirm the tank testing results:









These are the results:









More Data:

120 degree True Wind Angle (TWA) – performance summary:

Percentage performance increase at 120’ TWA delivered by DSS is from 1.2% at 6knots of wind speed to 44.2% at 25 knots of wind speed

This equates to being 0.14knots faster at 6 knots wind speed and 7 knots faster at 25knots wind speed

The DSS powered Magic Carpet is always faster than the standard Magic Carpet

90 degree True Wind Angle (TWA) – performance summary:

Percentage performance increase at 90’ TWA delivered by DSS is from 3% at 6knots of wind speed to 39% at 25 knots of wind speed

This equates to being 0.3knots faster at 6 knots wind speed and 5.7 knots faster at 25knots wind speed

The DSS powered Magic Carpet is always faster than the standard Magic Carpet

70 degree True Wind Angle (TWA) – performance summary:

Percentage performance increase at 70’ TWA delivered by DSS is from 4% at 6knots of wind speed to 29% at 25 knots of wind speed

This equates to being 0.5knots faster at 6 knots wind speed and 4 knots faster at 25knots wind speed

The DSS powered Magic Carpet is always faster than the standard Magic Carpet

40 degree True Wind Angle (TWA) – performance summary

Percentage performance increase at 40’ TWA delivered by DSS is from 2% at 6 knots of wind to 8% at 25 knots of wind, almost a knot faster

The DSS powered Magic Carpet is always faster than the standard Magic Carpet

Additional benefits are derived by the reduction in pitching and the increased efficiency of the sails when sailing close to the wind

Upwind and Downwind VMG differences

Whilst DSS provides unparalleled performance gains in reaching conditions it still provides significant gains in a windward/leeward environment as shown by the gains in the upwind/downwind analysis

The Wally 94 DSS upgrade outperforms the standard Wally 94 in VMG conditions

Further gains can be made with a bespoke yacht design where DSS is central to the initial design process


How!!! that is impressive. Hugh Welbourn deserves a big applause for this development that seems to me a lot more interesting to common sailboats that the rigid wings of the AC boats.

They have also tried it in a 40ft and in a Quant 28 that is already winning races. The Guys from the Italian sailing magazine "Vela" test sailed that boat and were really impressed, with the speed but mostly with the reduced heeling.

Here are the videos:

http://www.youtube.com/watch?v=D-ogozAZ24I

Quant 28 - Video 1 DSS 27' - YouTube

Dynamic Stability Systems 27 v1 - YouTube

Last edited by PCP; 09-28-2011 at 07:11 PM.
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