Boat Details

The Gemini 105 MC is a highly regarded, no nonsense, go anywhere with minimal fuss Catamaran enjoying a huge 'fan base'. One owner from new and travelled far and wide. It is very clearly a boat aimed at the owner, one who may want a boat for weekend and vacation cruising, or for a sailing couple on that extended cruise, the dream of a life time. For either, the Gemini is a successful design. 

The Gemini 105 MC is a true cruising Catamaran giving far more accommodation than one would find on an equivalent cruising mono-hull.



LOA 10.21
LWL 10
Beam 4.2
Draft 0.46
Displacement 5000 kg

Hull, Deck & Keel

The hulls, decks, and interior liners provide reinforcement of the structure and a base for furniture in solid fibreglass. The Liners are glassed and tabbed into the hull prior to installation of the deck.

The laminate schedule uses vinylester resins bonding a barrier coat of 1.5-oz mat followed by two layers of 18 x 15 Cofab mat.

The only coring is 1/2″ end-grain balsa across the fore deck and cabin top, and in cockpit areas there are no deck fittings.

The hull-deck joint is the tried and tested shoe box design bonded together creating a phenomenal bond. 

Once installed, the deck is secured with stainless steel fasteners on 5″ centres and the joint is covered by a gunwale guard.


The designer Tony Smith describes the hull shapes, as “revolutionary in the multihull industry.” They have a 9:1 length to width ratio.

“They closely resemble a racing monohull”, Smith says. “They are shallow and fat, with a teardrop shape to produce more speed and increase load-carrying capacity, narrower shapes allow hulls to be moved outward to produce stability without increasing beam.”

The foredeck has 39″ of clearance at the bow.

Asymmetric centreboards are used and were designed to reduce turbulence and drag and increase lift.

Constructed of a combination of fibreglass mat and Kevlar surrounding closed cell foam, they pivot upward to allow shallow-water anchoring.

Located in cavities on the hulls, they are raised from inside the main saloon, a convenient arrangement that does not interfere with galley or navigational chores.

Deck Equipment

  • Electric Windlass
  • Anchor and chain
  • 2 x Winches
  • Jammers
  • Deck Hatches
  • Cockpit Lockers
  • Genoa Tracks
  • Transverse Asymetric tack track

Interior & Accommodation

With an easy step over an 11″ door frame from the cockpit into the saloon there’s no comparing the open spaces of the MC’s 14-foot beam to the view along the saloon of a typical 34-foot monohull.


The saloon is light and airy with numerous windows and hatches.

Fibreglass surfaces are light and shiny, and veneers nicely finished.

There’s an elongated galley on the starboard side, matched by a navigator’s station along the port side, and twin staterooms aft.

The boat has enough bunks for 6-8 adults.

In addition to its spaciousness, the minimum headroom, even in the head, is more than 6′, so most passengers will be able to stand upright.

The centrepiece of the saloon is a C -shaped dining area surrounded by cushions that, with the table removed, provides ample apres sailing lounging.

When lowered, the table converts to a double berth.

The dining table is solid teak. Leaves increase the surface of the table to feed 6-8 adults, and it rotates 90 degrees to fit the crowd.

The space to port, amidships along the hull, is dedicated to the navigator. Part of the navigator’s 89″ long work surface is elevated.


The master stateroom is forward amidships and to starboard, with the bunk set at a slight angle. 

These quarters are filled with light by a port spanning the hulls that presents views through the forward window.

The queen-sized berth sits on an island with nothing below it but the hull. Storage is forward in the hull, and in bins to starboard.

The aft bulkhead of the compartment is enclosed by smoked glass that slides out of the way to provide a view for the helmsman.

The head with WC, Wash basin and shower is forward in the port hull. The head compartment is big, bright, and well-ventilated.

The Aft cabins have a 28″ x 28″ area in which to change clothes without banging the hull.


The galley located in the starboard hull on the MC 105 is increased by locating counter tops on the inboard and outboard sides of the passage, and with the addition+ of drawers and cabinets.

The space is filled with a two-burner stove with oven, and two-section stainless steel sink with hot and cold water.

A solar vent is located overhead.

The four-cubic-foot refrigerator is a Dometic American (converted 201). 

Gas Alarm

Navigation EquipmenT

  • Raymarine C80 Chart plotter with radar and AIS overlay, 
  • Tri data wind auto helm displays Depth & rudder indictor transducers
  • Fixed DSC VHF Radio
  • Handheld Cobra VHF
  • Furuno Navtex
  • CCTV camera mounted under Radar Dome with screen giving view of port bow

        Machinery & Propulsion

        • Westerbeke 30 B ( 3 Cylinders) 29hp
        • Sillette Sonic Catamaran leg
        • 3 Blade 
        • Heating

        Rig & Sails

        • The Selden mast carries straight double spreaders and is stepped on deck atop the main bulkhead. 

          “The mast on the MC is a foot taller than the previous model and has a 1′ crane.”

          "The mainsail now carries a large roach and full battens, increasing mainsail area from 260 to 340 square feet, a hefty jump. The 150% genoa carries 350 square feet."

        • The headstay is opposed by a split backstay with tensioner.
        • Halyards are internal.
        • Shrouds are dead-ended on chainplates at the main bulkhead.
        • The chainplates are bolted through steel strapping bonded into the foredeck area.
        • The mast is rigged with permanent check stays angled 20 degrees aft.
        • These are supported through the deck by stainless steel tie rods  married to a steel plate mounted horizontally in the hull.
        • The powerful sail plan is well supported and comprises;
        • Slab reefing mainsail with lines led back to the cockpit.
        • Stack pack mainsail cover and lazy jacks.
        • Roller Furling headsail on Furlex roller system.
        • Spinnaker pole on adjustable track.
        • Code 0 / Drifter

        Electrical Systems

        • Battery monitor
        • Sterling mains battery charger/12v-20a
        • Rutland 914i wind generator with controller
        • 120w solar panel with controller
        • Mermaid Air Con (2Kw)

        Plumbing & Tankage

        • Water tank
        • Fuel tank
        • Hot & Cold water

        Canvas work

        • Sprayhood
        • Bimini
        • Cockpit Tent

        GENERAL AND Safety Equipment

        • Lofrans 1000 12v anchor winch with approx. 15mtrs 6mm chain & 15mtr warp with remote controller
        • 2 Delta anchors
        • Seago 4man liferaft
        • 2 seago life jackets
        • Sea anchor
        • EPIRB McMurdo beacon
        • 4 winch handles
        • 8 warps various lengths
        • Fenders 9 x cylinder type 1 x step 2 bow
        • Engine spares
        • 2.6 metre ( approx ) dinghy mounted on davits
        • 2007 Honda 2.3 outboard engine

        Manuals for

        • Commissioning Manual
        • Westerbeke 30B Three Installation & Parts Manual
        • Sonic Catamaran Drive MK2
        • Lofrans Project 1000 Anchor winch
        • Furlex headsail reefer/parts list
        • Selden Parts List Boom
        • Mermaid Air Con
        • Mcmurdo Epirb
        • Rutland 914 wind charger
        • Seago Liferaft
        • Cobra Marine handheld radio/2013
        • Nautec B3 boiler/2019
        • Manuals for all Raymarine equip on board
        • Furuno Navtex receiver/NX-300
        • Breesser Weather Centre 5-1

        Additional Equipment

        • Winch handles
        • Fenders
        • Warps

        Please Note:

        The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.

        General note on safety equipment: Any safety equipment such as life rafts, Epirbs, fire extinguishers and flares etc. are usually personal to the current owner(s) and if being left on-board as part of the sale of a used vessel may require routine servicing, replacement, or changing to meet a new owner's specific needs.

        Whilst we make best effort to obtain documentation from Vendors it is advisable to check what is available before travelling to view or making an offer.

        Contact Us

        Hamble Office

        Tel: +44 23 8045 5714

        Email Us

        Chandlery Building,
        Hamble Point Marina ,
        GB, SO31 4NB

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        The above illustrations are not contractually binding. The financial information contained herein is for information purposes only (by way of example) and may be subject to change by the provider, General Yachting and Leisure Finance Limited. Michael Schmidt & Partner Limited is a Introducing Broker not a Lender and is regulated by the Financial Conduct Authority. Terms and conditions apply. Any loans will be subject to a customer approval, a satisfactory affordability assessment and a good credit history. A security will be placed over your boat in the form of a mortgage. Your boat may therefore be at risk if you do not keep up the repayments on your loan.