MULTICHINE 28
Construction Manual

Stem being laminated over a working bench. Note that supports are placed close together to ensure a perfect bonding.

Bulkhead at station 6 prefabricated at the working bench. All bulkheads should go to place already saturated with epoxy. To starboard are seen the cleats that support the navigation table and the drawers. To port side are shown the icebox structure and the opening for access under the galley counter.

Bulkhead at station 7 seen from abaft. The temporary support on top of the cabin trunk beam ensures the right height of the design water line above the strong back.

Bulkhead at station 9. To save plywood the temporary support is made separately and joined to the deck beam.

All bulkheads and stem already in place. The sheer clamps are the first longitudinal structural components to be fixed.

The structure ready to receive the plywood sheeting. The boarding platform built perpendicularly to the transom uses the same longitudinal stringer that serves as support for shelves, galley counter and navigation table.

Applying the glass fibre lamination over the plywood sheeting. Use wool rolls with an extension to save your back when applying resin. All edges should be rounded to avoid air bubbles.

Epoxy putty is applied over the already sanded glass fibre laminations. The smoother the hull is sanded the less putty will be needed.

Turning the hull upside. The lifting nylon ropes are attached to one side of the strong- back at station 3 and 7. When the other side gets close to the floor, tires are placed underneath protecting the topsides from damage.

When the centre of gravity shifts sides, the boat starts to turn by itself.

Some custom designed fittings for the Multichine 28.

The interior should be finished before the deck is assembled. Working in the open air and with better illumination is a great advantage. The boat shown hasn't finished the column of the mast support yet and the lockers behind the seats are also unfinished. A deck plate will be installed at station 0 to improve air circulation. We suggest placing a shell ventilator on top of the chain locker hatch.

A model for the cast iron finn-keel ready to go to the foundry. It is practical when the foundry supplies the fin-keel already drilled for the fixing bolts with threads already made. For this matter the foundry shall receive the template for drilling the holes in their correct positions. The same template should be used to drill the plywood laminated keel. Doing this there is no chance of error in placing the fin keel.

A finished deck with fittings already in place. The anti skidding surface should be designed with care with round corners and separations from fittings. All holes on deck should be saturated with epoxy resin and only after cure, fittings should be applied with bedding compound.

The interior of a M28 already finished. The inside space is totally used from anchor well to transom. The 1,85 m (six feet one inch ) headroom under the coach roof is quite unusual for a boat this size.

Details of the cabin counter. In this M28 the owner opted for a large sink instead of the two ones suggested in the plans. If wanted the ice box may be increased in size, eliminating the drawers between stove and ice box. A good insulation is essential for the icebox performance.

This photo is showing the vanity and it's sink. The builder preferred a smaller counter and a larger area for the shower gratings. The plans place the counter 100 mm larger than this one.

Launching of the Multichine 28 "Noctiluca". This is the third boat of the class to be completed. Soon after the mast was placed, Noctiluca sailed from the city of Cabo Frio in the state of Rio de Janeiro, to Santos, the main port of São Paulo in a 300 miles trip.

"Sabadear" was the first Multichine 28 to sail. The success of the class started when the nautical community discovered the special qualities of the design and from then on the class never stopped growing.

To sail a Multichine 28 is a gratifying experience. The perfect balance of the rudder, it's good stability and the seaworthiness of the underbody make this boat an excellent performer in good or bad weather.