The Greyhound 20, designed by the prolific British naval architect Ian Proctor and primarily built by Greyhound Marine in the late 1960s and early 1970s, is a classic example of the early GRP (Glass Reinforced Plastic) trailer-sailer movement. Measuring 19 feet 3 inches in length with a beam of 7 feet 2 inches, the vessel was conceived as a robust, family-oriented cruiser capable of being towed by a standard family car. Proctor, renowned for his work on the Wayfarer dinghy and the Prelude 19, imbued the Greyhound 20 with a distinct balance of stability and approachable performance, making it a staple in the UK’s coastal estuaries and inland lakes. While the production run was relatively modest compared to mass-market giants of the era, the design remains respected for its heavy-duty construction and the clever use of a ballasted swing keel, which facilitates both shallow-water exploration and ease of recovery on a trailer.
Greyhound 20 Information, Review, Specs

- Make
- Greyhound
- Model
- 20
- Builder
- Yacht-Service Jenneskens
- Designer
- W. Jenneskens
- Number Built
- Production Year(s)
- 1975 - 1990
Sailing Performance & Handling
The Greyhound 20 is characterized by its "stiff" sailing profile, a trait derived from a healthy ballast ratio and a relatively wide beam for a boat of its length. With a displacement of approximately 1,800 lbs and nearly 600 lbs of ballast contained within its cast-iron swing keel, the boat handles gusty conditions with more composure than many lighter 20-footers. According to archival data from Ian Proctor's design portfolio, the hull features a moderately full bow and a flat run aft, which helps the boat track well while reaching, though it lacks the pointed agility of a racing dinghy.
In light air, the Greyhound 20 requires a bit of momentum to overcome its wetted surface area, but once moving, it maintains a steady plane. Owners often remark on the "big boat" feel of the cockpit; the high coamings provide a sense of security that is rare in trailer-sailers of this size. The rigging is typically a simple masthead sloop configuration, designed for ease of single-handed operation. The swing keel is operated via a manual winch located within the cabin, allowing the draft to reduce from roughly 3 feet 6 inches to just 1 foot, making it an ideal candidate for "drying out" in tidal harbors—a feature frequently highlighted in period reviews by Practical Boat Owner.
Interior Comfort & Variations
Despite its sub-20-foot stature, the Greyhound 20 offers a remarkably functional interior for weekend cruising. The cabin typically features a four-berth layout, consisting of a V-berth in the forepeak and two quarter berths that extend aft under the cockpit seats. Headroom is limited, as is standard for this class, but the "pop-top" style main hatch (on some versions) or the generous width of the cabin house prevents the space from feeling overly subterranean.
Variations in the interior often reflect the era's bespoke approach to outfitting; some hulls were sold as "sail-away" kits, leading to a range of woodwork qualities. Standard factory models utilized basic GRP moldings for the galley unit, which usually included a small spirit stove and a manual water pump. The boat was built on the same hull platform that occasionally saw experimentation with different ballast configurations, though the swing keel remains the most common. There are no known "long-cabin" or "aft-cabin" siblings, as the 20-foot hull length effectively maximized the available volume for a single-cabin arrangement.
Known Issues & Buyer’s Checklist
Prospective buyers of a Greyhound 20 should focus their inspection on the mechanical and structural components unique to older trailer-sailers.
- Swing Keel Bolt and Pivot: The primary "gotcha" for this model is the wear on the keel pivot pin and the condition of the lifting cable. Because these boats are often used in salt-water estuaries, electrolysis and corrosion can seize the pin or weaken the cable. A loud "thunk" while sailing or excessive play in the keel trunk usually indicates worn bushings.
- Deck Core Delamination: Like many GRP boats from the 1970s, the Greyhound 20 uses a balsa or plywood core in some deck sections. Spongy areas around the mast step or the chainplates suggest water ingress and core rot, which can be a labor-intensive repair.
- Transom Reinforcement: If the boat has been fitted with a modern, heavier four-stroke outboard engine, the transom should be inspected for stress cracks. The original design was intended for lighter two-stroke engines.
- Window Seals: The large acrylic side windows are prone to leaking as the original bedding compound dries out. Evidence of water staining on the interior cushions or timber is a common sign that the windows require re-seating.
Community & Resources
The Greyhound 20 benefits from the broader community of Ian Proctor design enthusiasts. While there is no longer a dedicated manufacturer-supported association, technical support is frequently found through the Ian Proctor Designs archives and general trailer-sailing groups in the United Kingdom. Information regarding original sail plans and rigging specifications can often be sourced through the Proctor family’s historical records or via regional classic boat rallies where these vessels still appear.
The Verdict
The Greyhound 20 is a rugged, honest trailer-sailer that prioritizes safety and sea-kindliness over outright speed. It is an excellent entry-level cruiser for those who appreciate classic British design and require the flexibility of a lifting keel.
Pros:
- Extremely stable for its size due to a high ballast-to-displacement ratio.
- Shallow draft (1'0") allows for beaching and easy trailering.
- Heavy GRP layup offers long-term durability and impact resistance.
- "Big boat" feel in the cockpit provides security for families with children.
Cons:
- Relatively heavy to tow compared to modern lightweight 20-footers.
- Limited headroom and tight interior quarters for more than two adults.
- Sailing performance in light winds can be sluggish.
- Mechanical maintenance of the swing keel system is mandatory for safety.
Measurements
Construction & Hull
- Construction Material
- Fiberglass
- Hull Type
- Monohull Sailboat
- Keel Type
- Wing
- Rudder
- 1x —
- Ballast
- 573 lbs
- Displacement
- 1896 lbs
- Water Capacity
- -
- Fuel Capacity
- -
Dimensions
- Length Overall (LOA)
- 20.34 ft
- Waterline Length (LWL)
- -
- Beam
- 8.04 ft
- Draft
- 3.94 ft
- Max Headroom
- -
- Air Draft
- -
Rig & Sails
- Rig Type
- Masthead Sloop
- P (Main Luff)
- -
- E (Main Foot)
- -
- I (Foretriangle Height)
- -
- J (Foretriangle Base)
- -
- Forestay Length (est)
- -
- Sail Area
- 210 sqft
Calculations
- Sail Area / Displacement (SA/D) Ratio
- 21.93
- Ballast / Displacement Ratio
- 30.22
- Displacement / Length Ratio (D/L) Ratio
- —
- Comfort Ratio
- —
- Capsize Screening Formula
- 2.6
- Hull Speed
- — kn