CONSTRUCTION

The Anthem is an American built boat that offers craftsmanship unexcelled anywhere.  It is built to outlast all of us.  It offers the highest quality fiberglass construction.  Each boat is built of individual layers of fiberglass and carbon fiber fabrics, laid in place by hand, in a carefully controlled process.  Hulls and  decks are extremely strong, with extra reinforcement at all high stress points, such as the areas around chainplates, rudder fittings, the mast base, and under all other load carrying hardware. 

Unlike our previous boats, the new 70 is constructed with West System epoxy resin, fiberglass, Corecell high density core foam, and linear polyurethane inside and exterior finishes. It is approximately 8000 lbs lighter than the previous 70's that we have built. This weight reductions results in a spectacular performance improvement over our previous 70s, which were already among the world's fastest single hulled sailboats. With the new lighter weight, the boat will power at 18 mph. Sailing speeds into the 20's are routinely accomplished.

Many other builders use "chopper guns" to build their boats.  These are devices for spraying a mixture of resin and very short strands of fiberglass.  We don't use them, even though they reduce cost.  They do not, in our opinion, give adequate impact strength or controllable hull and deck thickness.  It is too easy for the operator, no matter how good, to miss a spot,  and it is almost impossible to inspect a chopper gun layup after it is built.  With a hand laid hull, it is very easy to count layers of woven fabric.  Since each layer offers consistent thickness, you are sure of having the proper fiberglass content.  The hand layup system provides a higher ratio of fiberglass to resin, resulting in a stronger, lighter boat.  Chopper gun laminates are brittle and more prone to failure.  We use only hand layup, with a high per­centage of woven fiberglass reinforcement, because that is the system that builds the best boats. 

In our past boats, we have not used cored sandwich construction. However, the technologies have rapidly improved, and we have taken advantage of these sandwich construction and epoxy structures to provide and enourmous weigh saving and an increase in strength.

 


This is the mold from which the 70 hull is produced.  It is being polished and waxed.  This was ollowed by application of many layers of hand laid fiberglass woven roving and carbon fiber fabrics.  Each layer is impregnated with resin and cured. After the first skin layers are completed, the Corecell foam core is bonded, under vacuum, to the outer skin. The inner skin layers where then applied. At its thinnest, the hull is approximately 1" thick. We do not use the Corecell core in areas that are under high stress, such as the mast chainplate locations, and the areas that support the keel, engine and rudder.

As shown in the drawings, there are a large number of tranverse bulkheads, bonded to the hull with 1/4" thick fiberglass layers.

There is a long ballast tank on each side. Each will hold 4000 lbs of ballast water. The combination of bulkheads and the long ballast tanks gives the boat enormous strength and stiffness.

The 70 has a one piece hull.  Many cruising boats are built in separate mold halves and joined at the centerline.  This is risky practice and these boats should be avoided.

All fittings are thru bolted, with heavily reinforced pads to carry the loads.   Side shroud, backstay and forestay chainplates are bolted directly to the heavily reinforced hull, not bolted to bulkheads that are bonded to the hull.   The hull at the chainplates is 1 3/4" thick.  Recognizing that leaks resulting from badly sealed hardware attachments can drive the owner crazy, and that a completely dry boat with a dusty bilge is one of sailing's great joys, we spend a lot of time and effort to seal and test all attachments.

The hull and deck are joined with 3/8" stainless steel bolts on 4" centers.  The joining flange is external so the bolt holes do not penetrate the interior of the boat, eliminating a potential source of leaks.  The hull-deck joint is one of the strongest and most leak proof available on any yacht.  We have yet to have a leak with this system.

The mast steps on a solid fiberglass hull beam, 12" wide and 5" thick, including the hull.  This beam also supports the forward end of the keel.  It extends sideways to pick up the chainplate loads.  There are 6 similar beams, 6"  thick by 6" wide, thru which the keel bolts pass .



KEEL: The keel bulb weighs 9000 lbs. The cast iron fin, a conventional NASA 9% airfoil, weighs 2900 lbs. The upper fin flange bolts to the hull with 10 each 1/4" nitronic bolts. Nitronic metal is far stronger than stainless steel, and more durable under water. The lower end the keel has a flange that thru bolts to the lead ballast torpedo shaped bulb.

The deep placement of the lead bulb ballast gives far greater stability that the bulbless keels on our prior boats.  


MAINTENANCE: The boat is designed for easy world wide servicing.  The engine and related components are standard items available throughout the world.   Everything is easy to fix.

To allow the owner or charterer more sailing and less work, we have tried to keep the boat extremely simple and as maintenance free as possible.  An occasional polishing and waxing, care of the sails and the engine, periodic inspections, zinc changes, and the usual haulouts and bottom jobs, should be all that will be required.

The mechanical and electronic systems are spread throughout the boat and are easily accessible.  With most other boats, everything is in the engine room, and it is usually necessary to sprawl across a hot engine to work on such things as bilge pumps, water heaters, steering, etc.   In the 70, only the engine and its related equipment, and some electrical items, are located with the engine. The engine room is big, and access to all sides of the engines is outstanding.

 

MASTS: The carbon fiber masts were produced by GMT and are finished with very high gloss black urethane.

 

EXTERIOR AND INTERIOR FINISHES: The interior of the hull and each of the bulkheads are covered with a short pile carpet. This looks great and really reduces the noise level inside the boat. With the carpeting and Corecell foam cored hull and deck laminates, this is one of the quietest yachts ever built.

The exterior, and the areas if the interior that are not carpeted, are finished with a high gloss linear polyurethane finish. Many layers are applied, and the surfaces, particularly the black hull, are stunning. These are finishes that will last for a long, long time.

We have spent most of our careers avoiding varnished mahogany interiors and exterior trim, because such finishes are murderouly costly to build.. On this boat, we went crazy with varnished mahogany, and damned the expense. Varnished mahogany offers one of the worlds most beautiful and warm, appealing finishes. As the photos show, we used a lot of it in this boat. The limited use outside keeps the maintenance down. Inside, where there is little direct sunlight exposure, the surfaces will stay perfect for decades without refinishing.