The Gemini 3400 105M series catamaran is a light displacement, twin hulled, moulded GRP sailing sloop. Designed by Performance Cruising Inc. the Gemini is the most popular cruising catamaran in the world with more than 1000 hulls manufactured over nearly 30 years. They have proven to be an excellent cruising design incorporating many features now common in more modern designs. The quality of construction used throughout the boat represents a build quality at the higher end of the production range. The twin hulls are mated to a deck structure that covers the entire length and beam, giving the design excellent rigidity. Decks are wide with rigging shrouds and genoa tracks set well inboard. The aluminum mast is deck stepped and supported by stainless steel rigging. The large aft cockpit is well laid out with wheel steering and seating for six or more crew. There are numerous lockers across the aft section of the cockpit and in the hulls. Each aft hull section incorporates moulded steps providing re boarding from the water or dingy. Incorporated into the aft cockpit bridge deck area is a separate, sealed and vented, propane locker. The inboard diesel engine is located in the aft centre locker of the cockpit and drives a retractable drive leg. Below decks in the central raised cabin area there is a large U shaped dinette amidships with the master suite double bunk ahead of the saloon and accessed via the starboard hull. Navigation station, switch panels, cabin heater, as well as the fridge/freezer are located to either side of the entrance door in this large open space. The twin hulls are accessed from the saloon via steps down on each side. Aft in each hull section there is a double bunk cabin with port light. In the starboard hull the galley stove and sink run forward followed with the access to the master suite. The port hull has the battery banks and storage lockers along the outboard side with the marine head and shower compartment at the forward end of the hull. Incorporated into each hull are the centre board housings and controls.
The hull is solid GRP, laminated from woven roving and mat with isophthalic polyester resin. An outer layer of polyester resin and gel coat protects against osmosis. The entire “hull” is a solid GRP one piece mould incorporating the twin hulls and bridging hull with extra laminates applied at high load areas. The centreboard casings and rudder casings are all part of the hull mould making them strong and leak free. The decks and cockpit sole are GRP sandwich with balsa wood core. The deck is a single moulded section covering the two hulls and bridging section. There is also a large single interior mould which is glassed into the hull section prior to the deck mould being bolted and sealed with a polyester putty. In addition there is a double gunwale guard over the bond. No deck fittings are bolted through this core thus the seal integrity is maintained. There is good access to the hull through the many inspection panels and lockers and access to the bilges is by means of panels in the cabin soles.
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