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Welcome to our e-newsletter. More details of the yachts below, and others, can be found on our updated, mobile friendly website at:       www.stimsonyachts.com
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We have the technology.....
We are proud to announce that at the start of 2015 Christian Stimson was elected to Fellow of the Royal Institution of Naval Architects (FRINA) on the basis of his long and varied career thus far - and his continuing efforts. To that end we are pleased to have added to our software capabilities with the adoption of the latest version of TDYN CFD (Computational Fluid Dynamics) program. The image above shows an analysis of our Global 80ft Sloop downwind at 10kn.

As ever, we have many projects at different stages of evolution. The second 20m/66ft performance cruiser has been launched by MAG Marin in Istanbul, while our 5.6m/18.5ft kit-built RIB has excelled on early sea trials in Auckland. In China our 10m/33ft production powerboat for Elite is currently having the plugs CNC machined. We also have a naval architecture work underway for a 20m/66ft 25knot flybridge cruiser in collaboration with JQB Ltd. of Seattle who are supplying the exterior and interior designs, and a 10m/33ft 45knot multi-role RIB with Anders Design to be built by Next Marine in Istanbul as a second generation of their Chameleon Craft. More to come on all these projects.

Details of these, and other projects, can be found on our newly updated - and now mobile friendly - website at www.StimsonYachts.com
66ft Performance Cruiser #02 launched in Istanbul
After an overnight transport from yard to marina through the streets of Istanbul, the second Windeseeker 66ft performance cruiser from MAG Marin left the shed to head to RMK Marine to be mated with her fabricated steel lifting keel. Shortly after that, she was launched and the rig stepped.

Early sea trials show she's not at all disadvantaged for having a comfortable cruising fitout compared to her more racey sistership, since the additional weight of the interior was offset by adopting the fabricated steel keel spar, saving a couple of tonnes over the original cast iron fin.

This version is flush decked, while her sistership has a raised saloon. The project was managed and the interior layout was detailed by Haluk and Murat Suntay in Istanbul, with structures engineered by Gurit in NZ. More images  to come.
Origami 5.6m RIB launched in Auckland
"Optimistic", an Origami 5.6m RIB, was launched in May and seatrialed in a mix of calm water and 75cm chop blown by 20kn seabreeze. She hit just over 31kn with a 90hp on the back - bang on the predicted numbers. Home-built by her owner from a CNC kit of engineered composite panels from Gurit, she is fitted with a half-round D-fender from Lancer.

Her owner reports: “Thanks once again. What a great day testing. I am so pleased with everything.  Your support has been amazing and you have certainly gone the extra mile for me. You have designed 'Optimistic' with everything I wanted – she has more fishing room than anything of similar size, and I am so impressed with its handling! I can't get over the soft ride - it is so smooth and docile. It’s an improvement on my previous boat, an otherwise very capable RIB. And with the water ballast tank flooded she is amazing in the rougher water. You have done a great job. It's everything that I wanted!”

 
Elite 10m production powerboat tooling in China
Our second smaller project in collaboration with Chinese yacht designer, Chris Wong, this 10m design for Elite Yachts in Yan Tai, near Beijing, is at the tooling stage. The hull plug was CNC machined in two halves, and the image above shows them being brought together. The hull is designed for 35kn on twin 300hp at 7.8tonnes, while the deck and interior have been drawn by Wong Yacht Design and are aimed at the domestic Chinese market. A 12m version with flybridge is next.
CFD Software
In keeping with our design philosophy of "Intuition guided by experience validated by data, created from analysis based in science" we have recently invested in the latest version of TDYN CFD software from Compass IS to enable us to offer a wider range of analysis capability. By bringing this in-house we are able to be more adaptable in revising a design's geometry and re-running analyses as the results indicate, rather than presenting a fait accompli data set for potentially poor candidates, thereby honing in on optimum design geometry faster and more cost-effectively.

The software is capable of modelling both aerodynamic and hydrodynamic flow, along with free-surface representation to investigate wake propagation and vessel motions in a seaway. This essentially gives us a virtual test tank AND a virtual wind tunnel to investigate both the quantitative (lift, drag and pressure etc) and qualitative (flow streamlines and vectors etc) aspects of candidate geometry at all stages of design - for hulls, keels and bulbs, lifting foils and flow around cockpits or superstructures. We are happy to offer this service for new or existing designs, and not just marine related projects. The image above shows our Global 80 Cruiser in a 1m head-sea.
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