BoatsGemini 105M

Gemini 105M

Catamaran, twin centreboards · Masthead Sloop · 1995–2000

A Tony Smith-designed catamaran with twin centerboards, offering a high sail-area-to-displacement ratio for agile cruising

Designed by Tony Smith, built by Performance Cruising Inc.

LOA
Beam
Draft (max)
Displacement
Hull type
Catamaran Twin Cbrd.

See her sail

The Gemini 105M, on the water

The fleet's own footage — the truest look at how she really moves.

Footage from Adventureman Dan

Is it for you?

Character

Where this design lands on the numbers a shopper trusts — read straight from her own ratios.

Shoal draftDraws 0.46 m, board up where she has one — creeks, sandbars and thin anchorages most keels have to stay out of.
LightHeavy

112 — light for her waterline, so she is easily driven and quick to accelerate.

Displacement / length 112
EasygoingPowered-up

20.5 — plenty of sail for her weight; lively and quick to respond.

Sail area / displacement 20.5
  • Draws more than ~75% of boats her size on file
  • Narrower than ~93% of boats her size on file

Compared with 168 boats of the same type within a quarter of her length.

What the fleet has seen

The Gemini 105M, as the fleet has seen it

Derived from the videos the fleet has analysed of this model. ▶ marks open the moment aboard.

The Gemini 105M is a 10.2-meter masthead sloop catamaran designed by Tony Smith and built by Performance Cruising Inc. between 1995 and 2000. Its defining feature is a variable draft system, allowing for 1.5 meters with centerboards down, 0.9 meters retracted, and 0.46 meters with rudders folded, enabling access to shallow anchorages.0:23 The DL version includes a Westerbeke diesel engine connected to an inboard/outboard leg that can be raised clear of the water.2:23 Aboard *Adventureman Dan*, a 1997 Gemini 105M named *Windward Express* completed a solo passage from Port Charlotte, Florida, to St. Thomas, U.S. Virgin Islands, navigating shallow cuts in the Bahamas.19:25 This Gemini 105M, with a 4.3-meter beam, fits standard monohull marina slips, costing $20 per night in St. Thomas.29:16 The boat carries 640 watts of solar on main panels and an additional 180-watt forward panel.2:02 The interior features a composting toilet, filtered fresh and salt water at the galley, and a full-width forward stateroom.

The living fleet

Sailed by the fleet

Where the fleet has filmed this boat.

Seen once across one channel of the fleet.

Basemap © Wikimedia Commons · CC BY-SA 4.0

The record

Full specifications

The complete reference set — tap any figure to switch between metric and imperial.

Dimensions
Weights
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
20.5
Displacement / length
111.6
Hull
Hull type
Catamaran Twin Cbrd.
Construction
Fiberglass
Production
Years built
1995–2000
Units built
110
Designer
Tony Smith
Builder
Performance Cruising Inc

Boats like this, on the water

More boats like her, on the water

Comparable boats the fleet has on camera: same type, within a quarter of her length. Open the boat, or watch the video — a timestamp means she only appears in passing.

Gemini 105MC10.21 mSame hull familyNear-identical lengthA versatile cruising catamaran featuring a cockpit that converts with canvas or solid panels for all-weather comfort
Gemini 105MC Review: The Affordable Cruising Catamaran That Actually Delivers! Ep 335 Lady K Sailingfrom Lady K Sailing
Dragonfly 3510.68 mSame hull family0.5 m longerA high-performance trimaran with a rotating fractional rig and a 34.54 SA/D ratio built for rapid, stable cruising
Dragonfly 35 - Delivering this fabulous Trimaran from Dartmouth to Troon0:14from Halcyon Yachts - International Yacht Delivery
C-Cat 3711.10 mSame hull family0.9 m longerA Marc Lombard-designed catamaran featuring a fixed twin-keel hull and a high 27.25 sail area-to-displacement ratio
Sailing Doodles - S1:E016:29from Sailing Doodles
Mahe 3611.03 mSame hull family0.8 m longer
Why is this Catamaran So CHEAP? - Ep 365 - Lady K Sailingfrom Lady K Sailing
Prout Event 3410.36 mSame hull familyNear-identical length
Do NOT Buy - Prout 34 Bluewater Catamaran - Ep 351 - Lady K Sailing2:25from Lady K Sailing
Fastback 309.30 mSame hull family0.9 m shorterA John Gross-designed masthead sloop catamaran with a high sail area-to-displacement ratio for spirited performance
How Does Sailing Transform Us? | #SAL #3423:23from Hashtag Sal

The family

Related models

The designs closest to hers — usually the rest of the builder's range, sometimes the same hull sold under another name.

Gemini 105MCA versatile cruising catamaran featuring a cockpit that converts with canvas or solid panels for all-weather comfortGemini 3400The first in the series to feature molded transom steps and a new kick-up rudder system for easier handlingGemini 3200An evolution of the 3000 series featuring an extended waterline for improved performance and a masthead rigGemini 31/3000The best-selling American cruising catamaran of its era, featuring a twin-centerboard hull designed for shoal-water accessGemini Legacy 35A high-performance fractional catamaran featuring a Warren Luhrs-designed cockpit and shallow 0.86m draft

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