Wednesday, April 25, 2012

Misty day in Newport.

Athena is in town. I had to take a photo about this arguably the prettiest, most expensive private sailboat in the world.
Funny, at the same time a client for whom I am designing a 105' Motor Yacht, sent me pictures of another three masthead schooner. What a contrast. Someone said: "Design is what you see". I admit Athena is not in the same category, with Huisman for builder and astronomical cost associated with such a vessel. But still, no matter looks count. Get a good Yacht Architect.

Sunday, April 15, 2012

Store and a Boat.

I see a good idea when I see one.
How many times have you seen a "Thule" or others on a car top. To only think, this is a boat upside down.
Well someone did it on a production scale. Boat and Store, or Store and Boat. Before you ask, yes I was consulted. But the infusion molding part was over my head. Any way, I can see others; canoes, kayaks, having the same treatment, being part of a storage.
Of course, there is a weight limit consideration before you capsize your SUV.

Thursday, April 12, 2012

Press Release from Numeca International.
NUMECA International: Fine/ Marine reducing the Drag for Tanton Yacht Design.
Numeca is happy to annonce that Fine/Marine, the leading CFD solution for naval architects, has been used succesfully to check the static and dynamic properties of the boat called "TYDe 68"designed by Mr. Tanton Y-M, naval architect and owner of Tanton Yachts.
Thanks to its unique features (adaptive grid refinement, quasi-static approach, sub-cycling method etc.) Fine/ Marine has been used to predict accurately the TYDe 68 wake patterns at different speeds, including free trim and sink. In a second step,these results (pressure distribution, free-surface elevation, streamlines, etc.) allowed optimization of the hull shape by reducing total drag, reducing fuel consumption and emissions at cruise speed.

" CFD computations for marine applications are nowadays routine work for naval architects at each steps of the design process", comments Yves-Marie de Tanton. "A coarse mesh, can be for instance used at the very beginning of the design in order to bypass the empirical relations and obtain a first idea of the boat behavior. CFD  can also be used at a more advanced stage of the design process by adapting the mesh and replacing the classical panel method. Eventually, a detailed mesh will provide accurate results (< 1.5% error) for classical resistance computations which are of major interest to all naval architects". Yves-Marie de Tanton states.

NUMECA International is a worldwide provider of Computational Fluid Dynamics (CFD) software and consulting services. NUMECA software is used for the simulation, design and of optimization of fluid flow and heat transfer. It is used by naval architects, product developers, design, and research engineers, allowing them to reach superior product quality and performances at a reduced engineering cost.

Wednesday, April 11, 2012

Circus Maximus

The other day, I found on the Steve Lirakis blog these two photos of a long time ago. Circus-Maximus was the third large size ULDB ( Ultra Light Displacement Boat) built in the world. Coming after Infidel, aka Ragtime in New Zealand, and soon after Merlin on the West Coast. The photo gives you an idea of how light she is at 66'-6". The other image shows the two owners, Don Ritter and John Raby.

Monday, April 2, 2012

Formula f.10M.

April 2, 2012
The F.10 is the largest of the Formulae based on Sport Boats concept. Others are the 9M; 8M; 7M, 6M.
They have in commun a basic hull shape developed over years. A chine boat designed around day sailing, with performance on all points of sail.  The chines have been adopted for speed, not only on the water, but also in terms of construction where large panels are used throughout, minimizing the time to splice the boat together, making the F.10M. within the reach of a competent Amateur Builder.  The hull is one thing, but in order to achieve the goal towards simplicity, a flush deck has been chosen, along with a very large cockpit, all with the intention to achieve speed.

The beam has been limited to 2.75M. (9') for transportation purposes.  Also for transportation, a lifting keel on a narrow blade has been adopted.  With a deck line fuller at both ends, the boat will have power and limits the amount of water to trample the deck.  Where is the bulb?  Having complete liberty on the draft issue when the lifting keel is lowered, I replaced the torpedo with an airfoil, with a deeper draft for the same center of gravity given by a shallower bulb.  It makes the construction of the apparatus a lot easier, and it is faster through the water.

To control the boat, two rudders have been fitted inside cassettes for removal.  They are placed well outside the centerline wave train.  In between the two tiller arms is an outboard well, the preferred auxiliary for this type of boat.  The penalty of weight would be the consequence of choosing too big an engine.

The cockpit is designed for a racing crew.  Properly spaced winches, deck gear and systems; ought to facilitate maneuvers.  I favor a forward location for the runners with less length of lines, and less chances of breaking mainsail battens.  The side loading on the mast is a question, but so his the pull sideways of the sprit sail, high on the mast.  Also, the location of the outboard engine in the stern might interfere with the runners.

The main spar should be made of composites of course.  More budget minded customers have recourse to aluminum.  I envision a single set of spreaders for simplicity, a single diamond rig with addition of diagonals and main shrouds, to equalize mast compression.  In adopting this sail plan, with a square head mainsail, the mast can be cut by one meter for a given sail area, saving in cost and weight.  The jib is about half the zize of the mainsail, withile the spritsail is close to three times the area of the later.

The Formulae provides spirited sailing performance, sported on a logical hull platform.  The concept is valid up and down the scale, only limited by individual choices.

Principal characteristics

Length on Deck.  10M.  32.8'

Beam on Deck  2.75M.  9.0'

Draft Keel up.  1.2M.  4.0'

Draft keel Down.  2.67M.  8.75'

Displacement.  2T  4400Lbs.

Sail Plan.  1.  12.45M.  40.83'  J  3.28M.  10.75'

                 P.  12.45M.  40.83'  E  4.72M.  15.48'

For information, please contact
                                                       Tanton Yachts.
Yacht Design. Naval Architecture. Marine Engineer. New Construction. Brokerage.
                                                           Est. 1974