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Seller's Description

Standard features:

DIMENSIONS: LOA: 31 BEAM: 11 6 DISPLACEMENT: 10,700 lbs DRAFT: 4 10 BALLAST: 4,400 lbs ENGINE: Universal 3 cylinder 25 hp HOURS: 900hr

ACCOMMODATIONS AND LAYOUT: Large forward island bed (Vberth) in private cabin Dining area to port side converts to large double berth aft Two dining tables (large for dinner and small for casual times)

RIGGING: Roll Furling Main Roll Furling head sail All Garhauer tackle Garhauer davits

Equipment: GROUND TACKEL: (2) Danforth anchor with 60’ of line

GALLEY: Top load and front load Adler Barbour refrigerator/freezer Hillerange 2 burner propane stove with oven Samsung microwave oven

HEAD: Fully enclosed marine head with Jabsco marine toilet, vanity sink and shower

ELECTRONICS AND NAVIGATION EQUIPMENT: West Marine DCS Fixed Mount VHF600 Radio. Raymarine C90W Wide Screen Multifunction Display w/map GPS Raymarine ST6001 wheel pilot fully integrated with the C90W Raymarine ST60 knot, depth, wind direction/speed

Kenwood KMR-330 DC receiver marine stereo (2) Cockpit mounted Polly Planar speakers Kenwood KCA-RC60MR remote control unit Ritchie lighted compass Panasonic Combination 12v TV and VCR

ELECTRICAL: Full AC/DC electronic panel at chart desk area located starboard aft Battery switch, volt meter Battery charger Pro Mariner ProSport20 plus 20 amp PROwatt 150w inverter. Yacht Corrosion Consultants Zinc Saver II (2) 20w Coleman Solar Panels mounted on custom Garhaurer Davits NC25A-12 solar charge controller Cruisair LP-09 Marine Direct Expansion DX Air Conditioning System (2) 4D deep cycle Batteries new 2021 12gal hot water heater

Sails: 135 UK Ulmer original (fair condition Sunbrella needs re-stitching UK Ulmer Roll Furling Main original (fair condition) Rolly Tasker 135 Genoa new 2012 (good condition) Rolly Tasker roll furling main new 2012 (good condition)

Maintenance: New Cutlass Bearing shaft, coupling and GTX packing 2019. New custom line bags 2019 New raw water impeller 2018 HWH replaced 2015 New damper plate and engine mounts 2011 Fuel tank removed and repaired in 2015, now raised slightly to prevent future corrosion. Oil and heat exchanger zinc, changed every year. Transmission fluid changed every other year. Fuel Tanks drained every year. Batteries kept at float voltage with solar charging system. Water level checked regularly, never deep cycled.

Other equipment included and notes: Dry boat, no leaks. Custom helm seat that fold to the side for easy boarding. 3rd double birth in salon using a short table post and the larger table with custom cushion. Swivel cleat added for main sheet. (Original clam cleat was difficult to use) Cheek block with jam cleat added for head sail furling (provides for better control when furled). Custom carbon fiber Whisker Poll Additional pull out swim ladder (6) pack life jackets (2) auto inflatable life jackets Electronic safety flair Stainless rail mounted propane grill West Marine hand held VHF radio 3 winch handles All original documentation Mercury 310 Inflatable w/Tohatsu 6hp outboard available.


Gerry Douglas
Catalina Yachts
Catalina 310 Owners Association
# Built
Fin + Bulb


Length Overall
31 0 / 9.5 m
Waterline Length
26 6 / 8.1 m
11 6 / 3.5 m
4 9 / 1.5 m
10,300 lb / 4,672 kg
4,000 lb / 1,814 kg (Lead)

Rig and Sails

Reported Sail Area
493′² / 45.8 m²
Total Sail Area
493′² / 45.8 m²
Sail Area
242′² / 22.5 m²
37 2 / 11.4 m
12 11 / 4 m
Air Draft
46 9 / 14.3 m
Sail Area
251′² / 23.3 m²
42 8 / 13 m
11 8 / 3.6 m
Forestay Length
44 3 / 13.5 m

Auxilary Power

Fuel Type
Fuel Capacity
27 gal / 102 l
Engine Hours


Water Capacity
35 gal / 132 l
Holding Tank Capacity


Hull Speed
7.7 kn
Classic: 6.9 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

7.67 knots
Classic formula: 6.9 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 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.


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


Wing Keel draft: 4.83’/1.47m

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

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