Seller's Description
Classic 1968 well maintained Cheoy Lee Offshore 31 ketch. Location: moored in St. John US Virgin Islands . Hauled out every year for hurricane season. Has new bottom paint and topsides paint. New prop and drive shaft, many new and replaced items. Engine is a Volvo Penta 30 hp and in great running condition. 3 sails are all in great condition. Burgundy sail covers, dodger and cockpit awning. Also has a like new Caribe C12 X inflatable dinghy with an older 15 hp two stroke Yamaha outboard selling separately! asking 5k . Ready to sail away!
Equipment: 3 sails: fully battened main and mizzen , and Jib in good condition with sail covers. Gold aluminum masts, teak decks have been removed, and replaced with non-skid and painted in great condition. Engel, portable fridge freezer, 2 house batteries, 2 engine batteries in great condition set up with 3 - 100 W each solar panels, brand new inverter 1500, Sunbrella fabric on cockpit cushions and interior cushions, 2 burner propane stove with oven, propane tank, dodger with small awning over cockpit. Plenty of dock lines, mooring lines, 4 fenders, extra anchors etc. The boat also has registered hurricane mooring in Hurricane Hole, Borck Creek, Coral Bay.
Specs
- Designer
- L. Francis Herreshoff
- Builder
- Cheoy Lee Shipyard
- Association
- Cheoy Lee Association Web Site
- # Built
- 150
- Hull
- Monohull
- Keel
- Long
- Rudder
- ?
- Construction
- FG
Dimensions
- Length Overall
- 31′ 0″ / 9.5 m
- Waterline Length
- 23′ 3″ / 7.1 m
- Beam
- 8′ 11″ / 2.7 m
- Draft
- 4′ 0″ / 1.2 m
- Displacement
- 10,700 lb / 4,853 kg
- Ballast
- 3,800 lb / 1,724 kg (Iron)
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 403′² / 37.4 m²
- Total Sail Area
- 403′² / 37.5 m²
Mainsail
- Sail Area
- 202′² / 18.8 m²
- P
- 29′ 11″ / 9.1 m
- E
- 13′ 5″ / 4.1 m
- Air Draft
- ?
Foresail
- Sail Area
- 201′² / 18.6 m²
- I
- 33′ 0″ / 10.1 m
- J
- 12′ 2″ / 3.7 m
- Forestay Length
- 35′ 2″ / 10.7 m
Auxilary Power
- Make
- ?
- Model
- ?
- HP
- ?
- Fuel Type
- ?
- Fuel Capacity
- ?
- Engine Hours
- ?
Accomodations
- Water Capacity
- ?
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- 1
Calculations
- Hull Speed
-
6.3 kn
Classic: 6.47 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
- Sail Area/Displacement
-
13.3
<16: under powered
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.
- Ballast/Displacement
-
35.5
<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.
Formula
Ballast / Displacement * 100
- Displacement/Length
-
376.3
300-400: heavy
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
- Comfort Ratio
-
35.6
30-40: moderate bluewater cruising 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
- Capsize Screening
-
1.6
<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.
Formula
CSV = Beam ÷ ³√(D / 64)
- Beam: Width of boat at the widest point in feet
- D: Displacement of the boat in pounds
Notes
It is thought that the OFFSHORE 31 is based on the BERMUDA 30 (in turn based on the HERRESOFF 28) with an extended counter and inboard rudder. Available as a sloop, sloop w/bowsprit or ketch.
Dimensions for ketch rig:
I: 31.50’/9.60m
J: 9.50’/2.90m
P: 27.50’/8.38m
E: 13.08’/ 3.99m
PY: 18.00’/5.49m
EY: 8.75’/2.67m
Tot. SA: 408.23 ft2/37.92m2
Dimensions for sloop w/bowsprit:
I: 33.00’/10.06m
J: 14.40’/4.39m
P: 30.00’/9.14m
E: 13.50’/4.11m
Tot. SA: 440.10 ft2/40.89m2
Dimensions (not rig) from orig. brochure. Dimensions and especially displacement reported by others vary.
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