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SCOW 1420Tison Thomas

New Design for the Bol d'Or

The SCOW 1420 is a monohull of 14.20m (rule maximum) having a flat bottomed hull inspired by the A scows.
The aim is to maximize power for a given efficiency. Scow hull shapes generate up to 30% more power than a standard hull shape for a given beam and displacement. The long overhang forward reduces bow down trim and increases waterline length when beating upwind or reaching. There is thus no need for aft water ballasts or to increase bow volume. The canting keel can be used to heel the boat to leeward when the boat is under powered in order to reduce wetted surface area.
This project was introduced during the 2008 Bol d'Or and both sailors and organizers showed a strong interest. Since then, the boat has been fully developed, a boat builder has been selected and the cost has been reduced.
The sailing conditions on lake Geneva tend to create highly powered sailing yachts. The recent LX-TCFX ranking allows all extreme monohulls to race against each other in real time. It is therefore a great place for naval architects to experiment.
Recently, there has been a few lightweight multihulls and foilers on lake Geneva. Foilers have still not proven to be the best solution for the conditions of Lake Geneva due to the lack of wind.
The LX-TCFX ranking is generally won by one of the Psaros 40 (2nd in 2009, 1st in 2008).VPP studies show that the Scow 1420 is 10 to 15% faster than the Psaros 40.
Later in July, Thomas Tison, the yacht designer, will present a paper on the influence of structural deflections (hull sag, keel structure) on upwind performance at the InnovSail conference organized by the Royal Institution of Naval Architects.
The next Bol d'Or will start on the 10th of June.

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