Designer Jason Ker shares a few comments about the new Sydney 37 and 43…
After a number of spins of the design loop, we have finally settled on the high-performance road for the new Sydney GTS37 & GTS43. Reducing the overall weight, maximizing the waterline length and ballast ratio. Not only does this fit well with our general design philosophy, but it also came out of our studies as being the most competitive route, something that bodes well for IRC. The hull shape is also very competitive under ORC.
The origins of the shape can be traced back to research on AC90’s (2007-2008), which is perhaps the first time the full weight of AC R&D resources was applied to an unconstrained hull form, leading to some considerable advances over a six month period. Adapting and applying the lessons we learned then and since to the problem of a fair-form IRC racer, we ended up with a powerful but low drag hull form that picks up additional stability when it heels. The transom width is moderate on the sailing waterline but on deck the max beam carries aft to allow the crew to sit further outboard and also give the helmsman very good visibility of telltales and waves.
A strong characteristic of our designs has been that they are all-rounder’s, able to pick up top results whatever the conditions. The Sydney GTS37 & GTS43 will be no exception, with a generous sail plan ensuring light air performance, good stability for reaching and upwind, while low drag is always helpful! Most of her competitors are relatively heavier. We found through our CFD analyses that with our powerful hull form we were able to reduce displacement while still remaining competitive in windward-leeward racing but gain a lot of performance downwind as the wind increased and in light air. Of course a great side benefit of reduced displacement is that the boat will be more responsive and fun to sail, the GTS37 being over 10% faster downwind in a breeze than a 40’ racer-cruiser from one of our competitors and the GTS43 even faster!
For more information please go to www.sydneyyachts.com