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1976 Westsail 28 Offshore Cutter

$24,500 USD

Seller's Description

Standard features

Boat REF# · 321447 Length · 280 Year · 1976 Construction · GRP Underwater profile · Long Keel Sleeping berths · 5 Engine · 1 x diesel 25hp, Universal M25 (1990) Lying · Seattle, WA USA -By Appt

5 VIRTUAL TOURS - 1 VIDEO - 107 PHOTOS - FULL SPECS and BROKERS COMMENTS CAN BE VIEWED OF THIS VESSEL by copying and pasting the link provided below!



Herb David
Westsail Corporation
Westsail Owners Association
# Built
Transom hung
FG solid hull/ply sandwich deck
Also Known As


Length Overall
35 0 / 10.7 m
Length On Deck
28 2 / 8.6 m
Waterline Length
23 5 / 7.1 m
9 6 / 2.9 m
4 3 / 1.3 m
13,500 lb / 6,123 kg
4,200 lb / 1,905 kg

Rig and Sails

Reported Sail Area
475′² / 44.1 m²
Total Sail Area
475′² / 44.2 m²
Sail Area
178′² / 16.5 m²
31 5 / 9.6 m
11 3 / 3.4 m
Air Draft
39 11 / 12.2 m
Sail Area
298′² / 27.6 m²
35 0 / 10.7 m
16 11 / 5.2 m
Forestay Length
38 10 / 11.9 m

Auxilary Power

Fuel Type
Fuel Capacity
36 gal / 136 l
Engine Hours


Water Capacity
79 gal / 299 l
Holding Tank Capacity


Hull Speed
5.9 kn
Classic: 6.49 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

5.9 knots
Classic formula: 6.49 knots
Sail Area/Displacement
<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.


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
>350: ultraheavy

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
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.


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



The Westsail 28 is the smaller sibling to the incredibly successful Westsail 32, a boat that captured the imagination of the American public with the “cruising life”. By the mid in 1970s when demand for the Westsail 32 was in overdrive, the pricing had crept up enough that Westsail needed a new boat to fill the entry spot. The Westsail 28 was launched to fill this in 1975 and was described as “a hearty little offshore cruiser perfectly outfitted for 2 to 3 to cruise trouble free around the world”. The boat made a number of appearances to boat shows along the West Coast and was offered as a complete build ex-factory and later also in kit set form (look for a K in the first 4 digits of the hull number).

Though similar in looks and detailing to the Westsail 32, the smaller boat is a ground up redesign by Herb David and features a number of key improvements. The rig has a taller aspect ratio, the keel is noticeably cut away in the forward sections improving her manoeuvrability, while the garboards are less hollow which help her track closer to the wind.

The resulting boat in comparison to the Westsail 32 is more manoeuvrable with a much more responsive helm and the ride is a tad drier (something the Westsail 32 suffered from). In relation to her size she is faster – expect 110 mile days, but in the wrong seaway she is known to hobbyhorse.

Some of the early boats differ from later ones as design refinements were made while they were rolling out. After the initial six or so boats, 700 pounds was added to the ballast and the total displacement went from 9,500 pounds to 13,500 pounds. With the extra weight the boat sat 4 inches lower in the water bringing the total draft to 4 feet 4 inches. Extra canvas was added to compensate, going from the original 480 sq.ft. to 545 sq.ft. The rudder was also enlarged and around hull number 20 a boomkin was added. In total only 78 boats were produced before the molds were sold in 1979 and shipped to Mexico, a far cry from the 800+ Westsail 32s in existence.

Links, References and Further Reading

» Westsail Owners Association

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