The Westerly Seahawk 35 Sailboat
Specs & Key Performance Indicators

The Westerly Seahawk 35, a heavy displacement fractional sloop, was designed by Ed Dubois and built in the UK by Westerly Marine Ltd.

A Westerly Seahawk 35 moored on the River Tamar near Plymouth, UK.A Westerly Seahawk 35

Published Specification for the Westerly Seahawk 35

Underwater Profile: Fin keel with spade rudder

Hull Material: GRP (Fibreglass)

Length Overall: 34'7" (10.5m)

Waterline Length: 27'0" (8.2m)

Beam: 12'3" (3.7m)

Draft: 4'11" (1.5m)

Rig Type: Fractional sloop

Displacement: 14,000lb (6,350kg)

Designer: Ed Dubois

Builder: Westerly Marine Ltd (UK)

Year First Built: 1988

Year Last Built: 1990

Number Built: 40

Published Design Ratios for the Westerly Seahawk 35

1. Sail Area/Displacement Ratio: Not published

2. Ballast/Displacement Ratio: 40.8

3. Displacement/Length Ratio: 318

4. Comfort Ratio: 26.3

5. Capsize Screening Formula: 2.0

Read more about these Key Performance Indicators...

Summary Analysis of the Design Ratios for the Westerly Seahawk 35

1. In the absence of any Sail Area/Displacement Ratio we are unable to make any assessment of the Westerly Seahawk 35's performance under sail. 

2. A Ballast/Displacement Ratio of 40.8 means that the Westerly Seahawk 35 will stand up well to her canvas in a blow, helping her to power through the waves.

3. A Displacement/Length Ratio of 318, tells us the Westerly Seahawk 35 is clearly a heavy displacement cruising boat. You can load her down with all your cruising gear and equipment and it will hardly affect her waterline. Not an ideal choice for coastal sailing, but she'll come into her own on passage in testing conditions.

4. Ted Brewer's Comfort Ratio of 26.3 suggests that crew comfort of a Westerly Seahawk 35 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 Seahawk 35 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.

The Westerly Seahawk 35: A Spacious and Comfortable Cruiser

The Westerly Seahawk 35 is a well-built boat that can handle rough seas and strong winds. It has a moderate freeboard and a low-profile coachroof that give it a sleek and elegant appearance. It has a wide and deep cockpit that can accommodate six people comfortably. It has a single wheel steering system that is responsive and easy to use. It has a large anchor locker and a sturdy bow roller for easy anchoring. It has wide side decks and sturdy handrails for safe movement around the boat. It has six opening ports and two large hatches for ventilation and light.

Westerly Seahawk 35 Accommodation LayoutWesterly Seahawk 35 Accommodation Layout

The Westerly Seahawk 35 is a versatile boat that can suit different sailing styles and preferences. It has two versions: the standard version and the owner's version.

The standard version has three separate cabins: a forward cabin with a V-berth, an aft cabin with a double berth, and a saloon cabin with two single berths.

The owner's version has two separate cabins: a forward cabin with an island double berth, and an aft cabin with a double berth. The owner's version also has more storage space and a larger heads compartment.

The Westerly Seahawk 35 has a spacious and comfortable interior that can sleep up to seven people in three or two separate cabins, depending on the version. The interior is finished in teak woodwork and blue upholstery that create a warm and cosy atmosphere.

The forward cabin is located in the bow of the boat and has either a V-berth or an island double berth, depending on the version. It has plenty of storage space in lockers, drawers, shelves, and under the berth. It also has an opening hatch for ventilation and light.

The aft cabin is located in the stern of the boat and has a double berth that spans across the width of the boat. It has ample storage space in lockers, drawers, shelves, and under the berth.

The saloon cabin is located in the centre of the boat and has either two single berths or no berths, depending on the version. It has a large U-shaped dinette that can seat six people comfortably around a folding table. The table can be lowered to convert the dinette into a double berth. The saloon cabin also has a settee that can be used as a single berth. The saloon cabin has plenty of storage space in lockers, drawers, shelves, and behind the cushions.

The galley is located on the port side of the boat, next to the companionway. It has a two-burner gas stove with oven and grill, a stainless steel sink with hot and cold water, a top-loading refrigerator, and a trash bin. It has ample storage space in lockers, drawers, shelves, and under the counter.

The navigation station is located on the starboard side of the boat, opposite the galley. It has a large chart table with a hinged lid that reveals a chart storage compartment. It also has a swivel seat, an instrument panel, and a switch panel. It has ample storage space in lockers, drawers, shelves, and under the seat.

The heads compartment is located on the starboard side of the boat, between the saloon cabin and the aft cabin. It has a marine toilet, a washbasin with hot and cold water, a shower with curtain, and a wet locker. It has ample storage space in lockers, drawers, shelves, and under the sink.

Hull and Deck
The Westerly Seahawk 35 has a solid fiberglass hull that is reinforced with stringers and bulkheads. The hull is painted white with blue stripes and has a molded-in rubbing strake for protection. The hull is bonded to the deck with bolts and sealant.

The deck is made of fiberglass sandwich construction with balsa core for stiffness and insulation. The deck is painted white with molded-in nonskid pattern for traction. The deck has an aluminum toe rail for safety and attachment points.

The cockpit is large and deep, with high coamings for protection from spray and waves. The cockpit has four self-draining lockers for storage of sails, lines, fenders, etc. The cockpit also has two large lazarettes for storage of larger items such as dinghy, outboard motor, etc. The cockpit has a single wheel steering system that is connected to the rudder by cables and pulleys. The wheel is mounted on a pedestal that also houses the engine controls, the compass, and some instruments. The cockpit has a folding cockpit table that can be attached to the pedestal for dining or drinks. The cockpit also has a folding sprayhood that can be raised to provide shelter from sun or rain.

The deck has two large hatches: one over the forward cabin and one over the saloon cabin. The deck also has six opening ports: two in the forward cabin, two in the saloon cabin, one in the galley, and one in the navigation station. The deck also has four fixed windows: two in the aft cabin and two in the heads compartment.

The deck has four winches: two primary winches near the helm for genoa sheets, and two secondary winches on the coachroof for halyards, reefing lines, etc. The deck also has several rope clutches and cleats for securing lines.

The deck has a stainless steel pulpit at the bow, a stainless steel pushpit at the stern, and stainless steel stanchions along the sides. The deck also has double lifelines with gates on both sides for easy boarding.

The foredeck has an anchor locker at the bow that can store up to 50 m (164 ft) of chain and 50 m (164 ft) of rope. The deck also has a sturdy bow roller that can hold up to 20 kg (44 lb) anchor.

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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