The Westerly Ocean 33 Sailboat
Specs & Key Performance Indicators

The Westerly Ocean 33, an aft-cockpit fractional sloop, was designed by Ed Dubois and built in the UK by Westerly Marine Ltd.

A Westerly Ocean 33 moored on the River Tamar near Plymouth UKThe Westerly Ocean 33 was the final model to be built by Westerly Marine in the UK

Published Specification for the Westerly Ocean 33

Underwater Profile: Fin keel & spade rudder*

Hull Material: GRP (Fibreglass)

Length Overall: 33'4" (10.2m)

Waterline Length: 28'3" (8.6m)

Beam: 11'2" (3.4m)

Draft: 5'6" (1.7m)*

Rig Type: Fractional sloop

Displacement: 11,023lb (5,000kg)

Designer: Ed Dubois

Builder: Westerly Marine Ltd (UK)

Year First Built: 1997

Year Last Built: 2000

Number Built: 33

* A bilge keel version was also produced, with a draft of 4'0" (1.2)

Published Design Ratios for the Westerly Ocean 33

1. Sail Area/Displacement Ratio: Not published

2. Ballast/Displacement Ratio: 40.4

3. Displacement/Length Ratio: 218

4. Comfort Ratio: 23.0

5. Capsize Screening Formula: 2.0

Read more about these Key Performance Indicators...

Summary Analysis of the Design Ratios for the Westerly Ocean 33

1. In the absence of any published Sail Area/Displacement Ratio data, we are unable to make any assessment of the Westerly Ocean 33's power under sail.

2. A Ballast/Displacement Ratio of 40.4 means that the Westerly Ocean 33 will stand up well to her canvas in a blow, helping her to power through the waves.

3. A Displacement/Length Ratio of 218, tells us the Westerly Ocean 33 is a moderate displacement cruiser, which means she'll carry all your cruising gear without it having a dramatic effect on her performance. Most of today's sailboats intended for offshore cruising fall into this displacement category.

4. Ted Brewer's Comfort Ratio of 23.0 suggests that crew comfort of a Westerly Ocean 33 in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not encouraging news for anyone prone to seasickness. 

5. The Capsize Screening Formula of 2.0 tells us that a Westerly Ocean 33 would not be as good a choice of sailboat for ocean passage-making, owing to the increased risk of capsize in strong winds and heavy seas when compared to a sailboat with a CSF of less than 2.0.

More about the Westerly Ocean 33...

The Ocean 33 is the last model built by Westerly in the UK, and it combines a modern hull shape with a traditional interior layout.

Westerly Ocean 33 accommodation layoutThe Westerly Ocean 33 accommodation layout

The Ocean 33 is available in two versions: a standard version with a draft of 1.7m, and a bilge keel version with a draft of 1.22m. The bilge keel version is ideal for shallow waters or drying out on tidal moorings. There is also another version of the Ocean 33, called the Westerly GK35, which is more performance oriented and built in Slovenia.

The Ocean 33 has a spacious and bright interior, with plenty of headroom (about 1.9 m) and ventilation. The boat has two separate cabins: a forward cabin with a V-berth and storage lockers, and an aft cabin with a double berth and hanging lockers.

The saloon has two settees that can be used as single berths, a folding table, and storage shelves. The saloon also has a navigation station with a chart table, instruments, and electrical panel.

The galley is located on the port side of the saloon, and it has a two-burner stove with oven, a sink with hot and cold water, a refrigerator, and ample storage space for food and utensils.

The head is located on the starboard side of the saloon, and it has a marine toilet, a sink with shower, and storage cabinets.

The Ocean 33 has a warm and cozy atmosphere inside, with teak woodwork and upholstery in various colors. The boat also has plenty of lighting options, including overhead lights, reading lights, and mood lights.

Hull and Deck
The Ocean 33 has a white fiberglass hull with blue stripes, and a white fiberglass deck with molded nonskid surface. The hull has a moderate freeboard and flared bow sections for dryness and buoyancy.

The deck has wide side decks for easy movement around the boat, and raised coachroof sections for more headroom below.

The cockpit is large and comfortable, with high coamings for protection from spray and wind. The cockpit also has two large lockers for storage of sails and equipment, and an aft locker for gas bottles. The cockpit has an ergonomic wheel pedestal with engine controls, compass, instruments, and autopilot. The cockpit also has teak seats and sole for warmth and grip.

The rigging of the Ocean 33 is simple and efficient, with an aluminum mast that is deck-stepped on a compression post.

The mast has two sets of swept-back spreaders for stability and reduced shroud tension. The mast also has internal halyards for neatness and reduced windage.

The boom has an internal reefing system for easy sail handling.

The Ocean 33 has various options for anchoring and docking, including an electric windlass with chain and rope, a bow roller with anchor locker, and a stainless steel bow fitting with fairleads and cleats.

The boat also has a stainless steel stern fitting with fairleads and cleats, and a folding transom ladder for easy access to the water. The boat also has a stainless steel pulpit, pushpit, stanchions, and guardrails for safety and security.

The above text was drafted by using GPT-4 (OpenAI’s large-scale language-generation model) as a research assistant to develop source material; we believe it to be accurate to the best of our knowledge.

Other sailboats in the Westerly range include:

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