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Gemini Owners Resources

This is a collection of information links for owners of Gemini Catamarans

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Our 316 stainless steel fittings, including our exclusive, patented hinges and struts, set new standards in marine canvas hardware. Tried and trusted on hundreds of boats, they offer you a wide new range of possibilities.

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Gemini 105M & 105MC Catamaran Engine Repower / Replacement

Boat type: sailboat, repower specifications, loa: 33.5 ft, lwl: 31.75 ft, displacement: 8,000 lb. (dry), builder: performance cruising inc. (usa).

The Gemini 105M and 105MC started life as a complete overhaul of the previous 3 generations of Geminis from the ground up.  Both 105s are the same dimensionally but the 105MC has a taller mast (1 ft) and a sizeable increase (30%) in sail area to 340 square feet.  Headroom was also increased slightly in the cockpit of the MC version.

Related Models

Gemini 105M & 105MC

Most Geminis 105M and 105MCs were originally powered with Westerbeke Diesel W30B3 3 cylinder engine (27 hp) connected to a Sillette Sonic Drive with a 16” 3 blade prop.  The drive leg is no longer in production but some replacement parts are still available.  Fortunately, the drive leg can be tilted enough to be completely out of the water when not in use.

Repower Recommendations

The Beta 25 or the Beta 30 are solid options for replacing the old westerbeke.  The Beta 25 is preferred as it is slightly smaller and allows for better access to the front of the engine.  The Beta 30 will fit in the space but access to the front of the engine is very limited so it can be challenging to replace the sea water impeller.  The Geminis are relatively light catamarans so the Beta 25 will easily push the vessel to hull speed.  Some customers prefer the additional power of the Beta 30 and feel the reduced access is worth the tradeoff.  The standard 16” 3 blade prop on the Sonic drive is plenty for either engine.

Installation Considerations – Thing to Know

• Our standard engine mounts match up very close to the Westerbeke engine set up. In most cases the Beta engine will need to be shimmed up by about ½” to ¾” to line up with the sonic drive flange.
• In most cases a longer than usual engine harness is needed. Gemini catamaran wiring can be challenging to access and run.  Most repowers run the harness to the starboard hull, up and then back to port to the helm station.  A 20 – 24 ft harness is needed.
• Customers typically opt to use our full Instrumentation panel (C-Panel) in lieu of our standard ABV Panel.
• We can also provide a new flexible coupling or refurbish the existing coupling to mate the Beta Engine/Transmission to the Sonic Drive.
• The standard exhaust system can be used given the location of the water lift muffler. No need to replace expensive exhaust components.

Key Search Terms: Gemini Cat, Gemini 34, Gemini 3400, 105 MC, 105-MC, 105 M, 105-M,  Sonic Drive, Sillette Drive, Gemini 3400,  Westerbeke W30, Westerbeke W30b3, Repower Gemini, Gemini Catamaran, Westerbeke repower

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Gemini Catamaran Models Guide

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Arguably one of the United States most popular cruising catamarans, Gemini Catamarans offer a range of domestic-built sailing and motor cruising vessels. Designed for affordability, compact design, ease of use without compromising on comfort and liveability.

The Gemini models deliver an almost unbeatable level of accommodation in relation to their size, with far more private cabin space, specious heads, and elegant dining/living space roomy enough to entertain in.

The Gemini range is a versatile craft to suit a wide customer base from serious liveaboard sailors to coastal weekend cruisers.

History of Gemini Design

The original Gemini hull shape and design was patterned in 1969 by Ken Shaw, with the Gemini 31. Over the years that followed there were serval variations to the original design in the LOA and styling but the Gemini image largely remained the same with both the Gemini 3000 and the Gemini 3200 model.

It was in 1996 when Tony Smith took ownership of the design under his company, Performance Cruising, that he redesigned the hull shape and introduced the much-loved Gemini 105 design.

For over 17 years Tony Smith retained the classic design of the Gemini 105 model, splashing over 1200 hulls from humble beginnings at his facility in Annapolis, Maryland.

At thirty-three feet long and with a beam of just fourteen feet the Gemini 105 was large enough to liveaboard but great value for money whilst also having the flexibility with retractable daggerboards for upwind sailing and gunkholing in the shallows, and due to its compact size, could snuggly fit within a conventional boat slip.

It ticked all the boxes for so many Americans looking for an entry-level catamaran without compromising on comfort.

Flowing a partnership with Hunter Marine and a generous buyout from The Catamaran Company, Gemini was able to live on under the direction of the Smith’s daughter Laura Smith Hershfeld who is now building variations of the classic 105.

We see the Legacy 35 sailing vessel as a fresh take on the proven favourite as well as Gemini’s very own power catamaran range with the Freestyle 339 and customizable Freestyle 37 model.

Gemini Models

Gemini 105mc.

The original and the classic Gemini 105-sailing design was originally conceptualised in 1996 and only later changed to the 105MC in 2004 with some notable differences being the extended cockpit cover to allow a full enclosure and a slightly taller mast.

It was in 2011 that Gemini offered the limited-edition design Touch Models whose upgrades included cherry veneer finishes, Corian countertops and ducted air conditioning.

Since its inception, the 105 model remains one of the most popular sailing catamarans, with a proven and much-loved design. Expect spacious accommodation, in relation to its size, with a light and airy saloon and cockpit, a 3-cabin layout and a large wet head.

The c-shaped settee in the saloon converts into an additional large bed for extra guests and with a propane-powered fridge offering ample food storage, this small vessel provides an excellent platform to entertain and host all your friends.

Built for safety rather than speed the Gemini 105 won’t break any records but still can achieve 40-50% of wind speed and the ability to point at about 50 degrees (apparent) to wind. Utilising the centerboards and sailplane contribute to its ability to sail closer to wind than most production catamarans out there.

And given the centerboards are lifting and the rudders are a kick-up design you can sail through as little as 2’ of water. Fitted with either outboards or Westerbeke 30b3 diesel engines, both options are fitted with great accessibility for servicing and maintenance.

The 105 design is no longer in production and has been replaced with the new Gemini Legacy 35, but there is still a large number of pre-owned Gemini 105 on the used boating market around the world.

Specifications

*Specifications provided from:

https://www.geminicatamarans.com/Gemini-Models/Gemini105Mc-Specifications.html

Designer Tony Smith suggests that this model is the ideal ‘couple’s catamaran’, perfect for those new to the boating world or a coastal cruiser on a monohull budget.

This was the design that has built the Gemini brand name into one of America’s most popular domestic-built catamarans.

For those in the market for pre-owned vessels, this model is well worth considering, especially since it still fosters an active and supportive owner’s association as well as a local builder who is willing to provide support to all Gemini owners.

Gemini Legacy 35

Based on the original Gemini 105 design, the Legacy 35 takes a fresh look at a proven family-friendly performance cruising catamaran.

Still retaining a 34-inch draft, allowing for shallow water anchoring, a 14-foot beam for easy haul out and compact size only 2 feet longer than original the flexibility that this vessel offers is admirable.

It is argued that this 35 model offers more interior than most 40 foot monohulls, still offering the iconic Gemini design down below. The large C-shaped lounge area in the saloon with a table facing aft, a spacious galley amidships on the starboard hull, with cabins and double berths fore and aft.

The port side accommodates the owner’s stateroom with an aft head, a navigation station amidships and a spacious cabin forward for the mast, there really is plenty of room for the whole family below the decks here.

Similar to that of the Gemini 105 the Legacy 35 handles easily, tracking straight with its shallow keels and together with a square-top mainsail and optional Selden sprit you can enjoy speedy sailing atop this stable platform, with virtually no heeling.

This design has also included an upgrade to the engine specs to include two 15 horsepower shaft drive Yanmar diesels, allowing for a much higher and efficient motoring speed.

*Specifications and features provided from:

https://www.geminicatamarans.com/Gemini-Models/GeminiLegacy35-Specifications.html

There is no doubt Gemini’s new Legacy 35 model has been well received by the wider American sailing customer base, receiving raving reviews from its cruising community. Gemini still retains its place in the market based on its core values of comfort, sailing ability and excellent value with this popular new sailing design.

Gemini Freestyle 37

The Gemini Freestyle 37 is a completely new concept for Gemini and also in boat design, fully customizable for a world where flexibility is key.

Each Freestyle model can be tailored to suit a variety of sailing ambitions, whether it be as a basic sailing family catamaran, a day charter boat or even luxury cruising vessel complete with chaise lounge, outdoor galley and wraparound bar.

Still based on the classic Gemini 105 hulls this vessel can be purchased at a very low base price and customised to suit any family. The basic base price offers a similar style to an open picnic-style boat with deck furniture available as modular or built-in sections from the factory, either at initial purchase or as a retrofit.

There is also an option for a full-size hardtop canopy that can be used as a sun deck or platform for solar panels. The added platform for solar allows for a new ‘green’ version of the design, developed to include electric engines and ample solar power for appliances.

Deck / Hull / Cockpit*

• Anchor Roller
• Anchor Well w/ Space for Rode and Chain
• Blister Prevent Technology Hull
• Bow Pulpit, Stainless Steel with Bow Seats
• Hull, FRP / Balsa Sandwich and Naidacore© Above Waterline, Solid FRP Bottom
• Hull, Structural Grid Reinforcement
• Lifelines, Double w/ Stainless Steel Stanchions
• Four Mooring Cleats, Stainless Steel
• Non-Skid Deck
• Rub rail, Full Wrap w/ Stainless Steel Insert
• Rudder w/ Stainless Steel Shaft
• Stainless Steel Telescoping Swim Ladder
• Through-Bolted Hull / Deck Join
• Through-Hull Fittings, All Marelon Below the Waterline
• Cockpit Traveler Arch, Stainless Steel w/ Mainsheet
• Full, Overhead Canvas Canopy
• Two Storage Lockers

Storage Cabinets

• Under-Counter Storage
• Sink, Single Stainless Steel
• Optional Refrigerator
• Optional Corian® Countertop
• Optional Fresh Water System, Pressurized, Hot and Cold

Forward Cabin

• Overhead Cabin Lighting
• 1 Deck Hatch, Opening
• Electrical Outlets, AC/DC
• Hanging Locker
• Queen Size Mattress, Foam
• Storage Shelving

Forward Head

• Sink with pull out shower faucet
• Optional Separate Shower
• Vanity Unit with Mirror
• Optional Corian Countertop
• Shower Curtain
• Teak Shower Grate in Floor
• Shower Sump Pump
• GFI Receptacle
• Optional Water Heater

Forward Cockpit

• Seating for up to Six
• Floor Drain
• Optional Cockpit Cushions
• Optional Cockpit Table
• Internal Halyards led to Helm Station
• Jib Furling System
• Jib, 100% Furling with Sun Cover
• Mainsail, Full Roach
• Mainsheet Purchase System
• Mast with Diamond Rig and Fractional Sail Plan
• Reefing System, Dual Line Led Aft
• Rigging Line Stoppers and Organizers
• One Winch Handles
• Winches, (2) Rigging, 2-speed Self Tailing

Systems / Electronics

• 12-Volt DC Electrical System w/ Breaker Panel
• Electrical Outlets, AC & DC
• Optional Alternator, 60-Amp with Dual Diesel

Inboard Option

• 2 – Group 24 batteries
• 1 X 2 Blade Props
• Battery Box, Port
• Battery Box, Starboard
• Optional Battery Charger, 40-Amp
• Bilge Pump, Electric, Automatic
• Engine Panel, Deluxe w/ Alarms and Hour Meter
• Gauges, Tank for Fuel, Water
• Fresh Water System, Pressurized Cold
• Navigation Light Package
• Shore Power System, 120 Volt
• Emergency Tiller

https://www.geminicatamarans.com/Gemini-Models/GeminiFreestyle37-Specifications.html

The Gemini Freestyle 37 not only offers the trusted design features of the original Gemini hulls but opens up the possibilities to a far wider audience of sailors with its flexibility in custom-built versions.

Gemini Freestyle 399 Power

Taking the streamlined design features that step further, Gemini now has their very first ultimate day-powerboat catamaran. Taking all the innovations of customizability from the Freestyle 37 and evolving this to suit the motorboat market.

Unlike the other models, this design incorporates a centre consul design powdered by twin Suzuki DF90A outboards with a cruising speed of 15 knots and 22.5 knots at full throttle. This helm station is positioned front and centre makes the cockpit an ever-larger entertaining space.

Similar to the Freestyle 37 this model is fully customizable to suit almost any purpose with basic day use versions, charter and full luxury fit-out options available.

Forward Head(s)

https://www.geminicatamarans.com/Gemini-Models/GeminiFreestyle399-Specifications.html

This design takes everything great from the earlier sailing models to put a new spin on the motor cruising catamaran, offering the same affordability, comfort and cruising capability that Gemini is so well known for.

Frequently Asked Questions

Answer : Gemini Catamarans are manufactured at the Hunter Marine plant in Florida.

Answer : The Gemini is designed as a coastal cruiser and therefore are designed for a different purpose. It has been reported that some owners of the sailing models have crossed open ocean passages such as the Atlantic and Pacific oceans.

Answer : The Gemini range is a moderately priced modestly constructed catamaran. Their standout features include excellent value, outstanding accommodations and solid sailing performance. There is an active and supportive owners’ association as well informative support from the local US-based build facility. Highlights include: Narrow beam offering ease when hauling out. These vessels fit into a standard slip, lowering the cost of ownership and reducing haul-out fees. Shallow draft combined with kick-up centerboards and rudders as well as outboards that can raise up. This allows the vessel to be anchored in as little as 2’ of water. Great sense of liveability . Despite its size, Gemini catamarans offer larger living spaces than most other comparable-sized boats on the market, combined with a minimum of 6’ of headroom inside and up to 6’7 of headroom in the cockpit. Better than average speed. With regards to their sailing vessel’s range they won’t necessarily bet speed records but for a vessel of her size achieves a noteworthy 40-50% of wind speed and the ability to point at about 50 degrees (apparent) to the wind. Outstanding engine accessibility . Careful consideration has been made with all models for access in and around the engine wells, for both the diesel and outboard fit-outs making it far easier to complete maintenance and servicing.

For more reading:

• Best Boat Accessories: Top 2022 Recommendations
• Motor Boat Types Explained: How to Find the Right One for You
• Best 6HP Outboard Motors That Will Make You Ready to Go

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Gemini Catamaran Transom Plate

• Thread starter CarlU
• Start date Dec 17, 2021
• Forums for All Owners
• Parts Search

I need to replace the transom plate on my Gemini 105m catamaran. The manufacturer Sillette no longer makes them and they do not have any distributors in the US. Used is fine as long as it is serviceable.  

Welcome to the forum!! Photo, dimensions, materials of construction and function?  

Hello sail sfbay, Your my first and only reply. I do not have any photos. What I need is a Transom Plate. They were manufactured by Sillette Ltd in the UK. They were fitted on many British catamarans with a single drive leg (outdrive in US English). It is mounted on the transom and accepts the output shaft from the transmission which goes through a bearing and on the other side is the ujoint and the input shaft for the drive leg. The whole thing is sealed from the inside of the boat and is lubricated by the gear oil in the drive. They were used on Prout, Gemini and others. Mine needs to be replaced but they haven't been manufactured for a few years and I haven't been able to find a replacement. Without it my boat is useless. Any leads, ideas or help would be appreciated.  

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Gemini 105 Review

• Post author By River B
• Post date October 24, 2020
• 3 Comments on Gemini 105 Review

No catamaran discussion would be complete without a nod to the 34’ Gemini 105M and 105 MC line of catamarans, created by designer Tony Smith. From modest beginnings in 1996, the Gemini 105 has become one of the most popular domestic-built catamarans in the United States, with over 1200 hulls splashed.

Gemini Catamaran History

Originally built in Maryland, the Gemini 105 model began with the 105M (meaning 10.5 meters) in 1995 and then a design change in 2004 to the 105MC, some notable differences being the extended cockpit cover to allow for a full enclosure and a slightly taller mast (while still remaining ICW-friendly). In fact, the “C” in the 105MC stands for “convertible,” likening the cockpit to that of a sports car.

Gemini production moved to FL in 2009 after the 2008 financial meltdown. In 2011, Gemini offered the Limited-Edition Design Touch TM models, whose upgrades included cherry veneer finishes, Corian countertops, and ducted air conditioning. In a partnership with Hunter Marine and a generous buyout from The Catamaran Company, Gemini was able to live on under the direction of Smith’s daughter, Laura building the 105 until 2012. Catalina on the west coast for Florida took over production of the Legacy 35 in 2015, which is still in production today.

While the Gemini 105 hasn’t won any official awards, according to SAIL Magazine, “[i]f there ever was a sub-40ft cat that should be included in an imaginary ’Catamaran Hall of Fame,’ it would have to be the Gemini 105.”

The Gemini 105s were designed to be affordable, compact, relatively easy vessels for sailors new to catamarans. In the performance – comfort — cost trifecta, there is a definite favor towards cost, which can equate to quality issues. However, Gemini owners swear by their performance and aspects of comfort.

Let’s see what they highlight.

• Narrow Beam. With a beam of 14’, the Gemini can tuck into a standard slip, lowering the cost of ownership and reducing haulout hassles that other catamaran owners sometimes face.
• Shallow Draft. With kick-up centerboards and rudders, and outboards (or drive legs) that can raise up, Gemini owners can anchor in as little as 2’ of water. Crowded beach anchorages are seldom an issue for these vessels, which can tuck in well away from other deeper-draft cats and monohulls alike.
• Livability . The 3-cabin layout provides both comfort and privacy and the wet head is huge for a small boat. The C-shaped settee converts into a large bed for passages or extra guests. The large, propane-powered refrigerator provides ample space for food and beverages without draining batteries. With 6’ of headroom inside and up to 6’7” of headroom in the cockpit, guests can enjoy the panoramic windows without stooping.
• Speed . While the Gemini 105 won’t be breaking any circumnavigation records, for her size, she’s fast—able to achieve 40-50% of wind speeds and the ability to point at about 50 degrees (apparent) to wind. According to Mark Baummer, on SV Argo, the Gemini 105 can easily hit speeds of 8 knots and he regularly logs double-digit speeds. More on why that may be in a moment.
• Engine Accessibility. Whether equipped with an outboard or the Westerbeke 30b3 diesel, accessibility is far and above that of most other smaller (and even some larger) catamarans on the market.

Gemini 105 Hull Construction

The Gemini 105 generally took about 5-7 days to produce, utilizing vinylester resins to bond a barrier coat of 1.5-ounce mat. Next comes two layers of 18 x 15 Cofab mat. The foredeck and cabin top are cored with 1/2″ end-grain balsa, as are cockpit areas in which there are no deck fittings.

The hull-deck joint is a shoebox design bonded with something the designer calls “black poly putty, which cures fast, using a chemical process, rather than an air-dry process. The deck is then secured with stainless steel fasteners on 5″ centers. The joint is covered by a gunwale guard.

Performance Factors

Catamaran designers utilize a broad number of theories in their attempts to achieve performance. For Gemini, this means a 9:1 length to width ratio, with a shallow and fat tear-drop shape intended to increase both speed and load-carrying capacity. Although, with only 18” of bridgedeck clearance, you’ll want to utilize that space sparingly, or risk losing any performance benefits you may have.

Centerboards and sail plan contribute to the cat’s ability to sail closer to the wind than most production catamarans out there.

Is the Gemini 105 a Serious Ocean Cruiser?

Tony Smith and his son Neil took a Gemini 105 through the northern Atlantic passage from Florida to England on a 23-day trip where they encountered 45-knot winds and 35-foot waves . Neither felt unsafe, but they also swore they would never make the trip again!

SV Tere Hau Nui was a 2003 Gemini 105MC that was sailed across the Pacific to Fiji. Again she was sold via our for sale by owner services in 2012. The new owner sailed her to Australia where she unfortunately dragged onto a rocky shore . The new owner, Brian, bought her back from the insurance company and has fixed her up. He splashed her again in 2020.

SV Slapdash is a 2004 Gemini 105Mc that circumnavigated, albeit with reported frequent stops to perform repairs and modifications. The owner sold by advertising on this website in 2012.

Cruising “celebrity” Carolyn Shearlock (of The Boat Galley fame), owner of SV Barefoot Gal, a Gemini 105M, cruises Florida and the Bahamas, but says she wouldn’t take the vessel offshore.

Mark Baummer, owner of SV Argo , sails his 1999 Gemini 105M in the Chesapeake Bay and offshore to New England, says he would feel comfortable taking the Gemini offshore. He confirms the boat is noisy when underway, saying, “it’s annoying, but you get used to it.” He also noted a great deal of flexibility in the hulls and the main bulkhead pieces working against each other. After a conversation with the designer, he was assured that this is “normal and helps to relieve racking stress on the boat.”

Gemini 105 owner John Grossenbacher says he crossed the Gulf Stream with 18-20 kt NE winds and 4-6′ seas. He reports sailing at 8-9 kts while cooking dinner with a glass of wine sitting on countertop—the classic catamaran marketing brochure image, right?

Like any vessel, it’s really a matter of personal preference, seamanship capability, and the stomach to put up with the chaos that the ocean can throw at you. For my money, I’d stick to coastal cruising on the Gemini. But that’s just me.

The Wish List

Gemini 105 owners love their boats, but there are always things that they wish were different or done better. Here’s what they have to say about that:

• The Gelcoat – gelcoat crazing is common on the Gemini 105
• Soft, leaky decks – as you’ll recall, the decks are balsa-cored, so water intrusion can take its toll on these vessels, so be proactive about re-bedding deck hardware, particularly around hatches and stays.
• Close – quarter maneuverability – while Carolyn Shearlock finds the Gemini 105M to perform better in close quarters than her Tayana 47, many find the Gemini, with its single engine, to be a bit squirrely in tight situations.
• Slightly Under-canvassed – under light winds, the Gemini has trouble, but over 10 knots and she sails beautifully.
• Forward Visibility – from the cockpit, the view forward is slightly challenging.
• Centerboard Rot – the original centerboards are prone to rot and worms. Baummer’s centerboards both fractured while on an offshore passage (the boat was fine, but didn’t point as well, as to be expected).
• Westerbeke 30b3 – this diesel gets mixed reviews and the company that services the drive leg have gone out of business and there is no clear source for parts.Many owners opt to replace the diesel with an outboard.
• Slamming – there may be no clear answer to this issue given the overall design, but some wish for a wave diverter under the bridgedeck to break up the waves.
• Inaccessible Wiring and Plumbing – with wiring looms attached to the liner prior to attachment of the liner to the hull, it’s virtually impossible to access without some level of destruction.

As these boats are not being produced anymore, these are some things to think about if you plan a refit. Many owners like that the boat is easy to work on (perhaps save the wiring), and at the size of the vessel, those who are handy can do a refit on the (relative) cheap.

The Bottom Line

Described by its designer as “the couple’s catamaran,” the Gemini 105 models are designed to be an introductory catamaran for former mono-hullers. Those who are looking for a coastal-cruising catamaran on a monohull budget might want to give the Gemini 105 some consideration.

• Tags Catamaran Interviews , Catamaran Reviews

River is a licensed USCG Captain with a lifetime of experience on the water. From the San Francisco Bay to the South Pacific, blue water to clear water, he’s sailed a wide variety of catamarans and crawled around in the bilges of more than he can count. You can follow his misadventures at www.tilted.life.

3 replies on “Gemini 105 Review”

I need an owners manual for this boat. Specifically the page that lists all the line lengths and guages.

The boat is in Panamá.

These are from the Gemini Owners Group .

Gemini 105 M Owners Manual Gemini 105 MC Owners Manual

I’d like to replace my sails, what are the sail dimensions for a Gemini M105?

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• Sailboat Reviews

Gemini 105Mc

This is the third version of an already thoughtful design that tony smith has been tweaking for years. it's a spacious, stable platform for a fast-cruising couple..

Tony Smith’s most recent design is the third iteration of a 34-foot catamaran that his company, Performance Cruising, Inc., of Annapolis, first introduced to the American market in the 1990s. The result of Smith’s continued tinkering, the 105Mc, is, he says faster than the original. Since this is our first review of the Gemini cat in any version, we can’t compare. But we can report that this boat is fast for a cruising catamaran. It’s also evidence that when a builder is willing to incorporate new and sometimes expensive ideas in design development, the results can be worth the investment.

Company History Tony Smith is a British expatriate who, with wife Susan, formed Performance Cruising in 1980. Following graduation from the University of East Anglia with a degree in engineering, he studied the mechanics of boat performance while participating in singlehanded races, including the first 2,100-mile Round Britain race, in which he finished fourth.

He began his boatbuilding career by constructing a 24-foot Piver trimaran in a shed in England. Then, in 1969, he developed a method of integrating foam coring with fiberglass, and produced the Telstar, a 26-foot, folding trimaran. During a 10-year run, 300 of the boats were sold worldwide. Along the way, he also was involved in the construction of 30- to 70-foot custom yachts.

Eventually emigrating to the US, he introduced the Telstar to the US market. Following the loss of the molds in a fire in 1981, he re-emerged on the scene with the design for a new catamaran, appropriately called the Phoenix, the first Gemini.

In 1993, the company launched the Gemini 3400, the first catamaran with a lifting underhung rudder system. It was eventually modified and reintroduced as the 105M, and the 105Mc is the most recent upgrade.

With 800 boats on the water, the company claims to be the best-selling catamaran manufacturer in the US. In 2002 the company’s 20 employees built and sold 54 boats, valued at $8 million, in a 16,000-square-foot factory. An additional 25,000 square feet of production space are currently under construction.

Six dealers are located in Florida, Maryland, California and Washington. Though the company also sells directly to customers, there’s no price advantage, and a connection to a local dealer would be an advantage if warranty issues arise.

A prototype for a new Telstar trimaran is undergoing sea trials, and can be seen on the Performance Cruising website.

Appearance/Design Smith’s perspective on sailing and yacht design fits the definition of a multihull advocate. From his standpoint, sailing is about speed, comfort, and stability.

From an aesthetic standpoint, comparisons of a 35-foot catamaran to a cruising monohull are usually akin to comparing a coupe to a delivery van. Though both may be designed to accomplish the same purposes, the execution varies greatly. Many cruising multihulls present a slab-sided appearance, and boxlike profiles with cabins extending high above deck level.

The 105Mc does not. When viewed from the quarter, the Mc has a relatively sporty appearance, even with the addition of a cockpit canopy that raises the boat’s profile. Viewed on the centerline, there’s no question she’s a cat, though the unsightly strakes of the 3400 version have been eliminated.

Smith says Gemini catamarans are designed for “serious ocean cruising,” adding that “a 23-day passage with son Neil across the North Atlantic opened my eyes to her capabilities.”

During the passage, he says, the pair encountered 45-knot winds and 35-foot waves, but never felt they were in harm’s way, and were comfortably ensconced in the cockpit wearing layers of fleece.

As most readers know, voyaging in multihulls offshore demands some different sailing techniques and priorities than sailing ballasted monohulls. The high initial stability of a multihull works both ways: the boat will mightily resist capsizing, but if it does go over and invert, it will be virtually impossible to right again without the assistance of a large ship with a cargo crane. Assuming the essential integrity of the hulls, the platform will be stable, and the crew will live in an inverted world pending rescue. However, very few owners of cruising multihulls have the occasion to take their boats into conditions that seriously challenge their initial stability, and (North Atlantic deliveries by designers notwithstanding) this Mc will usually be sailed in coastal or near-coastal waters.

The Mc has the same basic dimensions as the 3400. Note that the weights published in the company’s sales literature and on its website are at odds with each other. Dimensions in this article are accurate, Smith says: “The 105M and the Mc are the same weight—9,600 pounds. We realized after our trans-Atlantic trip that the weights we had given for the 105M were too low. We finally bought a pair of scales!

“The mast on the Mc is a foot taller than the 105M, 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.

A new option is a flat-cut overlapping genoa known in the multihull world as a “screecher.” This 490-square-foot sail produces spinnaker performance without adding a pole and guys.

The furling drum for the screecher tack can move athwartships on a curved track that is mounted at the prows of both hulls and across the bowsprit/anchor platform, forward of where the anchor is dropped through. This movable tack allows more flexibility with sheeting angles, especially when attempting to work to weather.

The cut of the sail allows it to be sailed to within 50 degrees of the apparent wind, and the tack arrangement doesn’t get in the way of the ground tackle.

Smith describes the hull shapes, introduced in 1995 on the 105M model, 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. Compared to the 3400, narrower shapes allow hulls to be moved outward to produce stability without increasing beam.”

The foredeck has 39″ of clearance at the bow. (Note that the builders refer to the deck area forward of the cabin as the “bridge deck,” but we’ll use “foredeck” as we don’t want to confuse it with the bit of decking often found between the cockpit and the companionway.)

Asymmetric centerboards were designed to reduce turbulent drag and increase lift. Constructed of a combination of fiberglass 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. Smith says the combination of hull and centerboard redesigns produced a boat requiring “25% less energy to push it the same speed.”

The cockpit sole has been lowered slightly to increase headroom to 6′ 7″. However, the modification does not impair the helmsman’s view forward through a large Lexan window that spans the deck. The wheel was moved outboard, allowing the helmsman to steer from the rail. Mainsail controls are now located on a thicker transom that provides more comfortable seating for crew, and the stern has been modified to allow access from swim ladders.

Smith’s personality is that of a consummate tinkerer. However, unlike industry giants, he enjoys the luxury of being able to continually focus his attention on one product with an eye toward evolutionary improvements.

Deck One early impression while sailing this boat is that the cockpit doesn’t resemble a spaghetti factory, though the boat is as well-equipped with name-brand equipment as a similar-sized monohull.

Halyards are led to winches on the mast rather than sheetstoppers on the cabintop because, Smith says, “you’re operating on a stable platform, even in a blow,” so moving forward is not as treacherous.

The mast carries straight double spreaders and is stepped on deck atop the main bulkhead. 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 checkstays angled 20 degrees aft. These are supported through the deck by a stainless steel rod married to a steel plate mounted horizontally in the hull. The powerful sailplan is well supported.

As is true on most catamarans, movement forward is relatively effortless. The combination of 14″ wide steps, a handhold on the canopy, a stainless steel handrail recessed in the cabintop, and 10″ wide decks, allowed us to move forward safely in blustery conditions we encountered on a test sail.

The large sundeck and plastic seats attached to the forward rail provide passengers comfortable lounging spaces forward of the mast when underway. Unlike a lightweight monohull, the cat’s performance is relatively unaffected by weight on the foredeck. Storage compartments are located in each hull.

The helmsman steers seated on a 27″ wide x 16″ deep seat that affords unrestricted views forward. We sailed with three passengers under the canopy without interfering with the skipper. Though the saloon may be enclosed in stinky weather, clear windows on the top half of the cockpit bulkhead slide open to allow the driver to commiserate with passengers.

The mainsheet is attached to the end of the boom and a section of track mounted on the stern rail that affords excellent sail control. However, the task becomes difficult when the cockpit is enclosed by a clear vinyl cover.

Lockers for storage of propane tanks and an optional generator are also located in the cockpit.

Belowdecks Step over an 11″ doorframe into the saloon and 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. That impression is augmented by a portlight array that provides 360-degree visibility, and four Bowmar hatches that allow light and air to flow in from overhead.

Fiberglass surfaces are light and shiny, and veneers nicely finished. The fit of most cabinetry is above average.

The centerpiece of the saloon is a C -shaped dining area surrounded by cushions that, with the table removed, serves as a conversation pit. When lowered, the table converts to a double berth.

The space to port, amidships along the hull, is dedicated to the navigator. The master stateroom is forward amidships and to starboard, with the bunk set at a slight angle. The head is forward to port. 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, but Smith rightly calls it “a couple’s boat.” This is a refreshing contrast to builders who overstate the livability of their products.

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.

Though the interior is not dramatically different than typical production boats, several touches contribute to a favorable impression. 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.

Part of the navigator’s 89″ long work surface is elevated and shaped so a chart kit fits securely.

Aft staterooms have a 28″ x 28″ area in which to change clothes without banging the hull. Both have double berths and opening ports. Propane sensors and fume detectors are standard equipment in the staterooms, as are audible alarms.

The size of the galley on the Mc was increased by locating countertops on the inboard and outboard sides of the passageway, and the addition of drawers and cabinets. Similarly, room for a built-in microwave was added. The space is filled with a Voyager 2000 two-burner stove with oven and broiler, and two-section stainless steel sink. A solar vent is located overhead. The four-cubic-foot refrigerator is a Dometic American.

Skipper’s quarters are filled with light by a port spanning the hulls that presents views through black Lexan. The queen-sized berth sits on an island with nothing below it but water. 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 corridor for the helmsman.

The head compartment on the Mc is big, bright, and well-ventilated. A good touch is a siphon arrangement that allows fresh water to be pumped through the toilet after every use, helping to eliminate odors.

Throughout the catamaran, spaces are well-organized and proportioned, so crews will rest, eat, and sleep in comfort. The skipper’s quarters are large enough to help compensate for the monthly mortgage payment and slip fees.

Construction The Gemini plant is a model of efficiency, with no wasted space, as we learned during an afternoon tour. Boats typically require 5-7 days to proceed past six stations to a forklift waiting to launch them into a creek behind the facility.

Hulls, decks, and interior liners that provide reinforcement of the structure and a base for furniture are solid fiberglass. Liners are glassed and tabbed into the hull prior to installation of the deck.

The lamination schedule calls for 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 foredeck and cabintop, and in cockpit areas in which there are no deck fittings.

The hull-deck joint is a shoebox design bonded with something Smith calls “black poly putty,” produced by Cook’s. Most builders prefer 3M5200 but Smith has used the putty for 20 years because “it has an 8- hour setup time that allows workers to be more precise in the placement of the two sections. It makes a phenomenal bond that is not brittle because it is chemically cured, a better alternative than air-cured products.”

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

Following his trans-Atlantic trip, Smith decided that the boat needed to undergo a weight loss program. When constructed, most boats are heavier than designed, and the Mc was no exception. Smith estimates the boat was 1,000 pounds too heavy.

“It was not a matter of speed, but of comfort,” he said. “I felt that by reducing the boat’s weight I could increase its buoyancy and produce a more comfortable ride.”

To that end, he replaced drawers in the forward stateroom with bins, substituted 1/2″ plywood for 3/4″ in some areas, and lightened the lamination in some nonload-bearing areas.

The boat’s Achilles heel could be the solving of wiring or plumbing problems, should they occur. Wiring looms are attached to the liner prior to the installation of the liner to the hull, and are virtually inaccessible. Of the arrangement, Smith says “our looms are foolproof. Remember, we’ve been doing this for 20 years and the process is evolutionary, not revolutionary.” Spare hoses are installed during construction to ease retrofitting appliances, and 12-volt wires are run through PVC to avoid heat and chafe. Wires exit the mast into the forward stateroom, and can be accessed in a panel between the deck and liner. Still, we wouldn’t want to perform subcutaneous surgery on this boat.

Performance We sailed the 105Mc on the day after the Annapolis Boat Show ended, when multihull manufacturers congregate to offer rides to interested sailors. A northeaster arrived that morning, bringing winds that built to 25-35 knots and produced a 3-4 foot chop. We were the only multi hull on the water.

With the wind abeam when we slipped dock lines, once we were underway she motored well despite her windage. On the bay, the boat sailed with little heel, and fast, under a reefed mainsail and a flat, 90% jib. Nearby, the three-person crew aboard a 30-foot monohull struggled to keep their boat on her feet.

Sailing closed-hauled, speed fluctuated between 6.5 and 7 knots. The short chop produced a bumpy ride and water over the bow, but we stayed on course with very little leeway. When we cracked off, speed fluctuated between 7 and 12 knots in wind speeds ranging from 17 to 25 knots. She was easy to steer, and responsive when we made sudden maneuvers to avoid crab pots.

The canopy protects crew from the elements, but may provide a false sense of security, as we learned when we moved forward from its protection and stepped into a chilly breeze and seaspray. Handrails are well located, and the nonskid was effective on the wet deck.

The boat is propelled under power by a single Westerbeke diesel, using an outdrive leg than can be lifted clear of the water. The current standard engine is 27-hp, up from the 20-hp engine previously installed.

Conclusions This third generation of Gemini cat is an improvement over her predecessors. She sails as well to windward as can be expected of a cruising catamaran (better than many) and shows good speed and stability off the wind. She’s easy to operate, and well-built. Spaces belowdecks are comfortable and larger than those on similar-sized monohulls, though the lack of a second head will be an inconvenience for skippers overnighting with large crews. With the 27-hp engine, a 150% genoa and furler, and electronics, the tab for the 105Mc is $129,500. Add a screecher for another $5,400.

Contact – Performance Cruising, Inc., 410/626-2720, www.geminicatamarans.com

RELATED ARTICLES MORE FROM AUTHOR

Where is the production site, and can a tour of the facility be arranged?

The boat is no longer in production. Tony retired and sold the company. I think during the 2005 market crash everything fell apart. The outdrive and engine aren’t made anymore. The new owners redesigned the boat and ruined the original idea. They tried to design a boat for the single handed rental market in the Caribbean with a deeper draft and fixed keels. It didn’t sell well.

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