Bluewater Sailboat – Gemini 105M

Overview

After completing a Pacific trip in 2008, the owner of Bluewater Sailboat Gemini 105 M commented, “The catamaran hull operates wonderfully in both open blue ocean and low winds off the Kona coast… The forward stateroom is queen-sized… the main cabin sleeps six… the complete head with shower has plenty of height…” What’s not to enjoy about great sailing and plenty of living space?

With over 1000 hulls produced over 30 years, the Gemini is the most popular cruising catamaran in the world. While the majority of those hulls are used as coastal cruisers, numerous have traversed oceans.

Gemini 105M
Gemini 105 M

Specifications for 105M

  • LOA: 33′ 6″
  • Beam: 14′ 0″
  • LWL: 31′ 9″
  • Draft, Minimum: 1′ 6″
  • Draft, Maximum: 5′ 6″
  • Displacement: 8600 lbs.
  • Bridge Clearance: 46′ 0″
  • Engines: 1, 27 HP Westerbeke with Sillette saildrive
  • Water: 60 US Gal.
  • Fuel: 36 US Gal.
  • Holding: 18 US Gal.
  • Designer: Tony Smith
  • Builder: Performance Cruising
  • Year Introduced: 1982
  • Year Ended: still in production
  • Total Built: 1100+

History

The Bluewater Sailboat Gemini 105M comes in three varieties: the traditional (1981-1990), the 3200 and 3400 (1990-1996), and the most popular, the 105M and 105MC (1996-2012). This article concentrates on the most popular models, the 105M and 105MC, which differ only in interior construction features. Annapolis, Maryland, produced the classic, 3200, and 3400. Performance Cruising has announced a collaboration with Hunter Marine to construct the 105Mc in Alacua, Florida. Pre-owned copies of all three categories are almost always available on the market.

The 105M or 105MC detailed here is the model most likely to be utilized in blue water. The hull lines were redone for this model, with the maximum beam moved further aft to lessen wave drag. These new hulls have a length: beam ratio of 9:1. The redesigned hulls also have slightly improved static stability. The improved hull shape is stiffer, making it more seaworthy for trans-ocean travel.

The hull is made of solid GRP that has been bonded with woven roving and mat with isophthalic polyester resin. Osmosis is prevented by an exterior layer of polyester resin and gel coat. The decks and cockpit sole are made of GRP sandwiched between balsa wood cores.

Structure

Tony Smith, the owner, designer, and builder of the Gemini catamaran series sailed a new Gemini 105Mc across the Atlantic Ocean in 2001 for delivery to Southampton, England, reaching speeds of up to 18 mph (surfing down the face of heavy seas). Many more of these adventures may be found in the print and web versions of Gemini Gems magazine, as well as the highly popular Gemini Yahoo community.

The sailor ascending the aft stairs is greeted by a roomy cockpit with wheel steering and plenty of areas for an afternoon picnic. A large, hard foredeck is encircled by a stainless pulpit that runs the length of the bow and lifelines that run down the slightly narrow side decks. Anchor chains and rode do not need to be extremely heavy with only roughly 8000 pounds of displacement. To sail a yacht with such small displacement across the ocean, heeling angles and reefing must be carefully considered. Anything more than seven degrees of heel indicates that it is time to lower sail. Anchor chain and rode do not need to be extremely heavy with only roughly 8000 pounds of displacement. To sail a yacht with such small displacement across the ocean, heeling angles and reefing must be carefully considered. Anything more than seven degrees of heel indicates that it is time to lower sail.

Performance

The sailor gains entry to the inside by returning to the cockpit. Starting at the same level as the cockpit sole, one is greeted by a salon table that comfortably seats four and, in a pinch, eight. The head and shower can be accessed by descending a few steps to the left and proceeding forward. A propane-powered rapid heater, similar to those seen in RVs and many European homes, provide hot water. The main advantage is that you can have hot water if you have water in the two 35-gallon fresh water tanks.

There are two births in the aft half of both hulls. The master suite is located forward in the starboard hull and has a queen-sized bed. This Bluewater Sailboats Galley has a lot of storage for dry goods and a propane-powered refrigerator (using the ammonia cycle instead of a compressor).

The roller-furled genoa and fairly tiny main power the Gemini, while many sailors add screechers, asymmetrical spinnakers, and jibs to their sail lockers. Each hull includes a cable-driven, hand-cranked centerboard that can be tucked entirely into a trunk in the hull, lowering draught (provided the rudders are also lifted), or dropped three feet into the water, substantially boosting upwind performance. While most sailing and motoring may be done with both boards halfway down, one of the Gem’s greatest features is the ability to adapt the boards to wind, current, sailing, or anchoring conditions.

A 27 HP Westerbeke diesel engine drives a Sillette tilting saildrive on the 105 and 105MC. The saildrive is frequently a cause of trouble, and bellows maintenance is vital.

If you are interested in learning more about the specifications and details of a sailboat, we recommend visiting the page Bluewater Sailboat data by  Ocean Wave Sail. This page provides comprehensive information and is an excellent resource for anyone seeking detailed information about 1000+ sailboats.

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