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Seller's Description

Please find enclosed the description for our well-loved Cohort IC34 Centreboard version. After 7 years of sailing the Caribbean, we have sadly decided to find our boat a new owner. This is a ready to go vessel that took great care of us and which we took care of over the years and upgraded to our liking. It comes with great comfort and everything you will need to go on your journey. All you need to bring with you is a pair of shorts and a t-shirt, everything else is already on the boat. We are leaving just about everything with Cohort to the new owners as we are moving on to land. All the tools, dive equipment, electronics, 200ah Lithium, and the most amazing dinghy you can think of - are part of the deal. Cohort is conveniently located in Curacao. From here you can go west towards Colombia, Panama and the San Blas Islands, or North to Dominican Republic or Puerto Rico. Easy to fly to Curacao from the US, Canada or Amsterdam. For more info and pictures, please do not hesitate to email us. Thanks, Catherine and Stefan

Equipment: Price: 25 000 USD Location: Curacao Builder: IRWIN (USA) Model: IRWIN CITATION 34 CENTERBOARD Yacht Designer: Ted Irwin Construction: Fiberglass Rigging Type: Masthead Sloop Year: 1979 Length: 34.3 Beam: 11.3 Draft with Centerboard Up: 4’ Draft with Centerboard Down: 7.3’ Displacement: 11.500 lbs Mast Height: 46 ft Accommodation: sleeps 6 (2 double berths and 2 single berths) Number of heads: 1

Engine: Inboard Diesel Yanmar 2QM20H raw water cooled 20HP Transmission rebuilt in 2022 ( lots of spare parts from old one)

Sails: Roller furling Genoa (150%), storm jib, fully battened main sail ( a spare main sail), spinnaker

Tanks: Fresh Water Tank: 80 gallons, Fuel Tank: 38 gallons, Holding Tank: 12 gallons

Batteries: House Battery: Lithium Iron Phosphate LifePO4 SOK 200ah (purchased in 2023) Starter Batteries: two AGM 155 ah each ( purchased in 2018, old house batteries)

Solar: 300 WATT solar panels for house batteries 50 WATT panel for starter battery

Electronics: 2500 WATT inverter (120V) and 700w backup inverter Victron MPPT Bluetooth controller Garmin chartplotter and depth sounder (Have charts for all of Caribbean and all of US) Raymarine autopilot with an extra computer ( back up secondary belt-driven autopilot) Nakamichi stereo head unit 3 speakers inside ( 2 outdoor speakers not installed yet) Marine VHF radio ( handheld West Marine VHF radio) Two Electric bilge pumps hooked separately to different battery banks Ice Maker Engel Fridge

Anchors : 35 lbs ROCNA anchor with 8 mm chain and 35 lbs Lewmar DELTA anchor with 10 mm chain

Gear: two inflatable offshore life jackets four standard life jackets harnesses; snorkelling and fishing gear

Scuba diving: two full sets of scuba diving equipment (including aluminium tanks, a dive computer, BCDs, octopus, wetsuits)

Tools: Too many tools to list for just about any project you want to undertake.

Dinghy: AB inflatable with aluminium bottom Model 9.5 AL (2020) and 15 HP Yamaha two-stroke (2020), No air leaks, no patches, covered with chaps. Motor always starts at 1st pull and runs like new. This is one of the best dinghy/motor combos you can get. Dinghy Davits

The V-berth forward with a new (2023) 20cm thick mattress to sleep in comfort, even in a swell.

The main salon is very accommodating with U-shaped dinette to port (sits 6 people) with newly laminated dining table that converts to a double lounge bed facing the TV, and a cozy couch to starboard.

Next is the navigation station with VHF radio and stereo head unit, and a single berth to port (currently used for fridge and sail storage) with a large wrap galley to starboard.

Galley boasts a 4-burner Eno stove with a full-size oven, extremely efficient 40 L portable Engel refrigerator that also works as a freezer, and Frigidaire ice maker, deep sink with 2 faucets (separate fresh water and salt water faucets with electric pumps)

Centerline companionway leads to a large cockpit with wheel steering. The cockpit has a small table, propane Magma barbecue, and wide decks for excellent access forward; very convenient access to the engine bay from both: cockpit and galley.

This vessel was repainted in January 2023 with new antifouling and new paint on hull (grey). The deck was repainted in 2019 (white grey non-skid). Even though the antifouling is pretty new, it is starting to show signs of primer in a few places. It should be good for another season or two.



Ted Irwin
Irwin Yachts
Irwin Yacht Owners
# Built


Length Overall
34 3 / 10.5 m
Waterline Length
27 3 / 8.3 m
11 7 / 3.5 m
4 0 / 1.2 m
11,500 lb / 5,216 kg
4,100 lb / 1,860 kg

Rig and Sails

Reported Sail Area
538′² / 50 m²
Total Sail Area
539′² / 50 m²
Sail Area
250′² / 23.2 m²
37 0 / 11.3 m
13 5 / 4.1 m
Air Draft
46 1 / 14.1 m
Sail Area
289′² / 26.8 m²
41 11 / 12.8 m
13 8 / 4.2 m
Forestay Length
44 2 / 13.5 m

Auxilary Power

Fuel Type
Fuel Capacity
30 gal / 114 l
Engine Hours


Water Capacity
80 gal / 303 l
Holding Tank Capacity


Hull Speed
7.7 kn
Classic: 7.01 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.


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

7.74 knots
Classic formula: 7.01 knots
Sail Area/Displacement
16-20: good 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.


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.
<16: under powered
16-20: good performance
>20: high performance
<40: less stiff, less powerful

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.


Ballast / Displacement * 100

<40: less stiff, less powerful
>40: stiffer, more powerful
200-275: moderate

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.


D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
20-30: coastal cruiser

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.


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
<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
<2.0: better suited for ocean passages

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.


CSV = Beam ÷ ³√(D / 64)

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


Shoal draft: 4.0’
Draft keel/cb - BU:4.0’/BD: 8.1’

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