Yacht Design







.    Tanton Yachts.jpg (5368 bytes).

Navigate Here


Yacht Brokerage



  checkred.gif (967 bytes) An Introduction to Cat Ketch and Free-Standing Rig

    Bulletin Board

  Where we are and how to reach us

   Naval Architecture


Tanton 42 Express Cruiser






Forward queen size berth with easy access to chain locker.  Vent is part of heat pumps system

Looking aft into head, note ample storage and enclosed shower beyond.


Note radar behind hatch, allows easy viewing from wheel and from nav station. Top of table with leaves down. Note nine rope clutches for simple line management.


View of stbd side setee, TV,VCR behind louver doors, stainless steel portlights.


Tanton 43 Cat Ketch “Friendship”
1. Custom built in 1982 for shorthanded, offshore cruising.
2. LOA 43 feet LWL 38 feet, Beam 13 feet Draft 4’-6”.
3. High bulwarks surround the deck for crew safety.
4. Hull is solid fiberglass below water line and balsa cored above.
5. Hull to deck joint was exposed fully re-glassed by professionals in 1995.
6. Hull below waterline has been coated with copper epoxy has no blistering.
7. Hull color id flag blue Awlgrip® 1991, House Awlgrip® in 1995.
8. Skeg hung rudder and fin keel.
9. Internal cast iron ballast, fully sealed.
10. Accommodations and exterior have been extensively modified by professional yard.
11. Recent retrofit work includes new:
a) Yanmar 76 HP turbo diesel engine
b) Two 44 gallon aluminum fuel tanks
c) Fixed and operable ports
d) Teak dorades
e) SS safety bars
Cat Ketch Rig
1. The two spars are freestanding, extra stiff carbon fiber for good windward performance.
2. The Spartite® system used at each mast.
3. The booms are aluminum, in the classic wishbone arrangement designed to be self -vanging.
4. Each mast has a custom stainless steel sail tack.
Randy Repass of West Marine is having a 64’ cat ketch built complete with un-stayed carbon fiber masts and wishbones and in an article in the American Yacht Review 2003-2004 stated that his rationale is that “the boat will be easier to sail and simple to handle”.
Yves Tanton the designer of the Tanton 43 and 45 says, ” I am convinced that free-standing- rigged cruising boats in the 35' LOA and larger range should have two masts to maximize performance, ease of handling and cruising enjoyment. The Cat ketch rig provides the optimum power to weight ratio for larger boats with the least amount of weight aloft. It allows for proper balance of hull/rig parameters, lowers the center of effort, increases the boat's stability, allows for the shallowest draft with the best windward ability, and lets you carry maximum sail with the easiest sail handling capability in all sorts of sailing conditions.
To accomplish the best design and construction of larger Cat Ketch yachts, it is necessary to develop the technology to produce lightweight and extremely strong carbon-fiber composite, free- standing masts to be used with wishbone booms. Aluminum and wood can be used on smaller boats were loading factor are not substantial enough to require carbon composite masts or justify their cost. They must, however, be fabricated from the highest-grade aluminum alloys and designed to accept bending moments to handle loads created by forces inherent in the boat's hull design. And preferably utilized with a Cat- ketch rig which subjects each mast to far lower loads in relation to the sail area than a similar size boat with cat boat rig or free-standing sloop rig. Use of the wishbone boom in its fullest sense requires that the full camber (draft) of each sail can be set with no pinching of the sail or distortion of air flow, while the entire boom should be capable of rotating more than 180 degrees about the spar. Not possible on a rig with shrouds or a boom affixed to a gooseneck. The wishbone boom acts as both the boom and vang, being one piece of equipment that replaces all the normal complexities of gear and equipment associated with straight booms affixed to a gooseneck at the mast. If increased roach is desired for racing or extreme light air performance, full battens need then only be adds to the top half of each sail. Wishbone booms also provide the easiest possible sailing with no threat of boom hitting anyone in the cockpit. Only one or two winches are necessary, and no large crew required handling them.
The rig technology and hull designs have created Cat Ketch rigged yachts where each mast is, in effect, a true flex loading beam incorporated into a hull designed and constructed specifically to work with its qualities.
Combined with wishbone booms, these yachts have proven to be well balanced with excellent windward ability. Yachts which can be handled with the absolute minimum of gear and equipment. The result is a sailing yacht, which I believe provides the best of both worlds--excellent performance, easy handling, and complete cruising comfort. No excess headsails or gear, no crew, and no work! They answer the need for an easier and less complicated way to enjoy sailing.
1. Sail area main: ~400 square feet. Mizzen: ~390 square feet.
2. Main and mizzen new in 1997, by Doyle® fully battened, Spectra® cloth with three reefs each plus Cunningham.
3. Storm main and storm mizzen by Doyle® new 1991.
4. Windward staysail Doyle® new 1997

Sail Handling
1. Lazy jacks and wishbones allow easy control of sails.
2. Sail track, sail slides and batten slides by Strong® systems 1998.
3. Separate SS track for the storm sails.
4. Adjustable travelers for main and mizzen with three part sheets.
5. All controls lines led to cockpit and terminated at Lewmar® rope clutches.
6. All deck hardware is new Schaefer® or Lewmar® 1995-2001
7. Main and mizzen set up for electric hoisting.
8. All running rigging is low stretch renewed as needed.
9. Lewmar® electric cockpit winch.
10. Two manual winches in cockpit for ease of sail shaping and reefing.

Safety and Deck Hardware
1. Stern pulpit mounted six man Switlick® raft with custom SS launching cradle.
2. Stern pulpit mounted LifeSling®
3. Double safety lines ending at solid stainless steel safety rails surrounding the cockpit.
4. Two reinforced gates
5. Port side folding SS boarding ladder.
6. Cabin house safety rails are polished SS in lieu of teak.
7. Eight SS mooring cleats with bronze haws pipes.
8. Nielson Electric windlass with salt water wash down outlet.
9. Primary anchor is 45# CQR with 100 feet of 3/8” chain plus 300 feet of nylon rode.
10. Secondary anchor is a Fortress™ with 20’ of chain and 300 feet of nylon rode.
11. Stern anchor is Danforth® with 20’ of chain and 200 feet of nylon rode.
12. Two manual Henderson® two stage bilge pumps.
13. Three electric bilge pumps.
14. Engine raw-water pump has valve to allow use as bilge pump.
15. Three large cockpit drains.
16. Teak decks for slip resistance.
17. Automatic fire extinguisher in engine compartment.
18. Two ten pound fire extinguishers, two 2.75-pound fire extinguishers.
19. Floorboards fastened down for offshore work.
20. Sail cloths for cockpit.
21. Lee cloths for berths in salon.

1. Yanmar® 76 HP turbocharged and inter-cooled new 1995 ~1,000 hours.
2. Engine mounted to Aquadrive® constant velocity joints to eliminate vibration. (1995).
3. Shaft seal is by PSS (1995)
4. Prop is three bladed feathering type by MaxProp (1995).
5. Two custom aluminum fuel tanks piping with level gauges holding 44 USG each, new 1995.
6. Electric fuel transfer pump to aid in bleeding fuel system if needed.
7. Racor® fuel filter and water separator.
8. Racor® fuel vent filters to prevent water intrusion into vents and vent fuel spills.
9. Engine compartment sound insulated.
10. Separate engine room ventilation system.

1. Compete rewiring 1995 using tin coated Anchor® cable.
2. Light fixtures new 1995.
3. Twin 150 ampere alternators. Spare 55 and 150-ampere alternators, (4-total).
4. Gel Cell starting battery.
5. Trojan® golf cart house battery bank @ 630 AH.
6. Ample Power® alternator control and system monitor.
7. All circuits fused.
8. Heart® 2,000 watt inverter and three stage battery charger.
9. 120-volt AC outlets in all cabins, three in galley.
10. Separate power feed for heat pump heating and air conditioning unit.
11. Wind generator mounted on custom SS bracket.
12. Remote control spot light.

Navigation and Radio Equipment
1. Vigil Radar 32-mile set in hatch visible from cockpit.
2. Autohelm™ instruments and GPS.
3. Micrologic® loran.
4. Alpha® heavy duty below deck autopilot with dedicated quadrant
6. Standard Horizon® VHF in cockpit
7. SEA, Digital SSB with tuner and antenna.
8. Sailing instruments located at the helm and at the navigation station.

1. Inline galley for safety.
2. Force 10® three burner stove with oven and broiler.
3. Cockpit propane grille mounted out of the way on special bracket.
4. Double bowl stainless steel sink with salt water and fresh water spray, fresh water hand pump.
5. Microwave oven
6. Refrigerator, vegetable crisper and a separate 100F freezer all powered from a twelve-volt, ¾ HP electrically driven compressor.
7. Filtered ice water tap for clean potable chilled water.

1. Two private cabins with double berths.
2. Forward king berth, aft double berth.
3. Main salon has one double and one single berth.
4. Salon has space for dining for 8 in comfort.
5. Large cockpit with fixed center table and two, drop leaves with space for dining 8.
6. Cockpit seats are full length for sleeping.
7. Forward cabin has walk-in cedar closet.
8. All custom cushions and berths new in 1999 by S&S Fabrics.
9. Full cockpit enclosure/bimini.
10. Cockpit cushions

2. Cambridge Sound Works® speaker system with woofer with CD /FM stereo.

1. Large head with a Lavac® WC and a separate stall shower.
2. Thirty-gallon polypropylene holding tank with diverter valve (1995) and two stage Henderson pump for emptying tank.
3. Water heating is by engine using 20 gallon SS electric water heater new 1995.
4. Two SS water tanks totaling ~100 gallons total.
5. Pressure hot and cold water to each fixture and to cockpit shower.
6. Bronze though-hulls. The number of through hull fittings has been reduced to the minimum needed and all abandoned openings filled professionally.
7. Pur® 35 water maker.
8. Two aluminum 10-pound propane tanks complete with leak test gauge.

Heating Ventilation and Air-conditioning
1. A 16,000 BTUH (new 2000) water source heat pump provides heating and cooling at the dock.
2. Heating underway is from engine hot water and a Dickenson® Newport diesel fireplace.
3. Four dorade boxes with SS scoops.
4. Fans are provided in every cabin, head and galley.
5. Seven, Bowmar® ocean series hatches.
6. Seven stainless opening ports (new 1995) provide ventilation.
7. Screens are provided for all ports and hatches and the companionway.

Dinghy and Motor
1. Zodiac® inflatable floor type new 2000.
2. Motor 9.9 HP Honda® 4 stroke engine 2000.
3. Motor hoisting gear and Edson® bracket at stern pulpit.

1. Fan belts, filters, water pump impellers, alternators.

Items Excluded from Offer
1. Clock and Barometer, artwork
Friendship is located in the water on Buzzards Bay and is offered for inspection and ready to sail away.

Here are just a few of the comments received about Tanton from professionals in the trade:

blarrowdwn.gif (875 bytes)

blarrowdwn.gif (875 bytes)

"Yves-Marie de Tanton is one of the great designers but not exceedingly well known outside the trade. He pioneered the unstayed carbon fiber Cat-Ketch rig. He specializes in the sort of intensely personal custom designs that keep his customers coming back."    S. C. B.

"Yves-Marie is a very talented designer with lots of fresh ideas, a guy worth keeping tabs on."   D. S

"Tanton has designed some of the world’s fastest and most exotic racing yachts. This gives Tanton a most unusual perspective on design features for esoteric cruising boats."  R. H.  P.

"I had the pleasure of working with Yves-Marie when I was on the East coast. I must say that my own drawing style and design approach was markedly influenced by the six months that we worked together. Yves-Marie probably draws the fairest set of lines that I have ever seen. His lines gallery are truly works of art."  B. P.

"Tanton has never been accused of surrendering to convention."  Q. W.

"Tanton has already designed five boats for me and currently designing two more. This speaks for itself."  B.  G.

"Tanton had met the criterion creativity and had offered a highly professional design that would provide a two-person crew a uniquely capable world cruiser."  B. W.

"Un Français, Yves-Marie TANTON, s'est installé à la Mecque des U.S.A. : Newport. Il compte parmi les meilleurs."   G. R-D



[Description][Layout][Standard Equipment][Options][For Sale]
[Testimonials][Boats] [Contact Us][Contact Webmaster]
[Bulletin Board][Plan of the Month]
new.gif (908 bytes)[Express Cruiser]new.gif (908 bytes)