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Seller's Description

S/V Sea Turtle is a 2004 Gemini 105Mc catamaran for sale by owner. She has been owned by only 2 owners and is a well-maintained northern boat with NO LEAKS. She was kept on the lake in Detroit from 2004-2010. We had her trucked by C&J Transport (experienced Gemini movers) to Portsmouth, NH and then sailed her home to Maine. We have sailed her summers only except for one trip to Florida and back.

We care for our boat deeply and the only reason we are selling her is to move to a slightly larger catamaran. We have delayed this move because there are so many features which the Gemini has that even larger cats do not offer: queen berth with a view of the stars, 18” draft (with boards, rudders, and drive leg up), the ability to point to 40 degrees when the boards are down, retractable drive leg and rudders (no worries about catching pots), large comfortable settee, hammock seat on the stern, gas refrigerator, awesome dinghy davit system, and, because she is 14’ wide, the ability fit in a regular slip and be hauled at the lower-cost yards. We have made improvements every year (just replaced the engine) and can share our maintenance log.

Bridgedeck: standing headroom is in U-shape seating for six to eight at the table, which can convert to a double bunk when necessary. With chart area and storage to port. Her master cabin is forward in the Starboard hull: standing headroom; double berth aft; navigation station port midship; head forward. Starboard hull: standing headroom; double berth aft; galley midship; access to master stateroom forward.

The Galley workspace is astounding. The countertop is 7’6” long x 19” wide with a 5 foot counter on opposite side, 3 drawers, and storage under surface. Double stainless steel sink with pressure hot and cold water. Propane stove with two burners, oven and broiler. Dometic front opening 3.8 cubic foot electric refrigerator w/ freezer. Galley fully equipped with dishes, utensils and cooking equipment and the cockpit includes a Barbeque.

Location: Maine offers some of the best cruising in North America and we can recommend boatyards. However, we are also available to help sail her south and/or we can recommend a reputable trucking company.

About the Gemini 105Mc: The Gemini 105Mc offers excellent value, outstanding accommodations, and solid sailing performance. It is designed for a broad range of use: owners who want a boat for weekend or a family going on the dream of a life time. For either, the Gemini is a successful design with three decades of experience in its pedigree and an active owner’s group. Specifications Builder: Performance Cruising Inc. Designer: Tony Smith Model: Gemini 105 Mc Flag: USA Year Built: 2004 Length Overall: 33’ 6” ( 10.21 m) LWL: 31’ 9” ( 9.75 m) Beam: 14’ 0” ( 4.27 m) Draft: Max Draft: 5’ 6” ( 1.52 m) / Min Draft: 1’ 6” ( .46 m) Displacement: 8600 lbs Mast height: 48’ 0” ( 14.63 m) Sails: Mainsail full batten with 2 rows of reefing points Genoa jib with Furlex roller furling, jib extender Tides Marine Strong Track System with slides Sail cover and storage bags Head room: 6 ft 1 in Cruising Speed: 6.5 Knts Max speed 9.9 knots Engine NEW remanufactured 27 hp Westerbeke 30B3 (2020) coupled to Sonic Catamaran drive Mk2 Cabins: 3 - 1 Queen / 2 full Heads: 1 AirHead composting toilet installed in 2018 Fresh Water 60 Gallons ( 227 l) Fuel Tankage 36 Gallons ( 136 l)

Boat Inventory

Accomodations:

  • 1 queen in master cabin with 2” memory foam topper and moisture barrier under mattress,
  • Mounted TV/DVD player,
  • Solar fan in hatch and 12V fan
  • Brass reading light on teak block,
  • 2 double cabins in rear port and starboard hulls.
  • Each mattress has a moisture barrier underneath and a waterproof mattress cover.
  • Overhead we have mounted teak pieces for extra storage, added shelving to the lockers, and brass hooks on the doors.
  • Settee in saloon converts a queen-size berth.

Salon & Galley:

  • Mermaid 16,500 BTU A/C (barely used)
  • Bus heater (port hull)
  • Cushion covers are sunbrella fabric and NEW. Area rugs are new.
  • Oven/stove: 2-burner Voyager 2000 with broiler
  • Refrigerator/freezer: Dometic RM2452 Propane/120v
  • Double stainless steel sink with dishtub that fits sink
  • Whale tip toe pump
  • Built-in Origo 750 watt microwave & paper towel holder
  • There are 2 12V fans and LED lighting in galley
  • 8” brass ship’s clock (see picture)
  • Interior wood is teak, oiled every year at least once

Cockpit:

  • Snap-on cockpit cushions
  • NEW redesigned cockpit enclosure in gray sunbrella
  • Full cockpit screen enclosure
  • NEW Lexan windows on coach roof
  • Custom built-in fiberglass binocular box (see picture)
  • Kato dinghy davit system with added stabilizing arm (solar panels sit on top)
  • Rear hammock with snap-on padded cushion (2014)
  • 2 propane tanks (in starboard locker) with holding straps.
  • Outdoor hot/cold shower hose & folding swim ladder on starboard steps
  • Magma propane BBQ grill with NEW sunbrella cover (port railing)
  • 5 aft cleats

Head:

  • AirHead composting toilet installed in 2018.
  • Deck-mounted solar vent (NEW: replaced in 2020)
  • Enclosed shower & hot/cold shower and sink
  • Wooden towel tack
  • Mirror and storage

Electronics & Navigation:

  • Raymarine C80 chartplotter/GPS
  • Raymarine Pathfinder Radar
  • Raymarine Auto Pilot ST4000
  • Raymarine ST60 Tri-data: depth, speed, water temperature, wind
  • Raymarine Smart Controller S100 Auto Pilot Remote
  • Raymarine Ray54 VHF Marine Radio
  • Ritchie Compass
  • West Marine stereo with Bluetooth capability, auxiliary input, CD player

Electric:

  • 2 150-watt solar panels with controller (mounted on dinghy davits on stern)
  • 2 4D AGM house batteries, lightly used
  • 1 Lifeline AGM start battery (850 CCA)
  • ProSine2.0 2000 watt inverter/charger
  • Xantrex battery monitor
  • 3 12v outlets and 6 120v outlets
  • 5 hard-wired Hella Marine 2-speed turbo fans
  • 50 ft. shore power cord with adapters

Sails and Rigging:

  • Sails are original but regularly cleaned
  • Battened mainsail with 2 reefing points, NEW halyard, sheet, back stay & reefing lines
  • Genoa jib with Furlex roller furling,
  • Whisker pole (deck-mounted)
  • Tides Marine Strong Track system with slides
  • 2 #40 Lewmar winches
  • 2 Plastimo tubular radar reflectors (2017)
  • Sail cover and storage bags

Engine & Sillette drive leg:

  • NEW remanufactured 27 hp Westerbeke 30B3 (2020)
  • NEW rebuilt marine gear (2020)
  • NEW updated Sonic flex-coupling (2020)
  • 2 18-gallon fuel tanks with new stainless filler caps (see picture)
  • Racor fuel filter / water separator
  • Sonic Catamaran drive Mk2
  • NEW bellows and cover, latch spring & oil drain plug
  • NEW hydraulic hose for Sillette lift
  • NEW steering control lines
  • Heavy plastic custom-built propeller shield (see picture)

Centerboards/Hull/Bottom:

  • NEW Teleflex steering cables
  • Bottom stripped and barrier coat applied (2017)
  • Ablative bottom paint applied every year
  • NEW this year: Sea Hawk Biocop TF antifouling paint
  • NEW centerboard control lines (2019)

Water:

  • 2 30-gallon water tanks
  • NEW water tank Y-valve
  • 6-gallon marine water heater (120v or engine-heated)
  • Outdoor hot/cold hose on starboard stern
  • Pressure water pump system
  • Bilge pump and/or shower drain pump
  • Salt water washdown pump and hose in foredeck anchor locker

Anchors/Deck:

  • 35 lb. anchor with 35’ of 1/4” (7mm) high-test chain & 100’ braided 5/8” rope
  • Quick Genius 600 electric anchor windlass with handheld control
  • Anchor bridle
  • 4 Fenders & 6 docklines
  • Snap-on sun covers for 2 large Lexan windows
  • 2 flag halyards

Safety:

  • Xantrex Propane Leak Detection System
  • 2 fire extinguishers (1 in salon, 1 in cockpit locker)
  • Safety flares
  • Lifelines
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Specs

Designer
Tony Smith
Builder
Performance Cruising
Associations
?
# Built
?
Hull
Catamaran
Keel
Twin Centerboard
Rudder
?
Construction
FG

Dimensions

Length Overall
33 5 / 10.2 m
Waterline Length
31 9 / 9.7 m
Beam
14 0 / 4.3 m
Draft
1 6 / 0.5 m 5 6 / 1.7 m
Displacement
8,000 lb / 3,629 kg
Ballast
?

Rig and Sails

Type
Sloop
Reported Sail Area
690′² / 64.1 m²
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Air Draft
?
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
Westerbeke
Model
?
HP
27
Fuel Type
Diesel
Fuel Capacity
36 gal / 136 l
Engine Hours
?

Accomodations

Water Capacity
60 gal / 227 l
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
10.8 kn
Classic: 7.55 kn

Hull Speed

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Formula

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL

10.75 knots
Classic formula: 7.55 knots
Sail Area/Displacement
27.6
>20: high performance

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

Formula

SA/D = SA ÷ (D ÷ 64)2/3

  • SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D: Displacement in pounds.
27.6
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
?

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Formula

Ballast / Displacement * 100

?
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
111.5
100-200: light

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
111.5
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
11.3
<20: lightweight racing boat

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Formula

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

  • D: Displacement of the boat in pounds
  • LWL: Waterline length in feet
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet
11.3
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
2.8
>2.0: better suited for coastal cruising

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

Formula

CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
2.8
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

GEMINI 105MC is a development of the 105M with a number of interior updates. Most visibly, however, the cockpit of the 105Mc can be temporarily enclosed with either canvas or solid panels.

This listing is presented by CatamaranSite.com. Visit their website for more information or to contact the seller.

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