Sunray 21 Information, Review, Specs

Sailing Performance & Handling

The Sunray 21 is characterized by a "seakindly" motion that prioritizes safety and predictability over raw speed. Arthur Howard’s design philosophy for the Sunray, much like his work on the Leisure 17, utilized a relatively high displacement-to-length ratio to ensure the boat remained upright and manageable in a blow. While technical archives from the era suggest a displacement of approximately 2,400 lbs, the boat’s handling is defined by its choice of underwater profile: it was offered in both a single fin keel for better windward performance and a twin (bilge) keel version for drying out in tidal harbors.

According to historical owner testimonials and period assessments from regional yachting circles, the Sunray 21 tracks reasonably well due to its skeg-hung rudder, which provides a level of protection and directional stability often lacking in modern spade-rudder designs. However, the boat’s relatively heavy hull and modest sail area mean it requires a stiff breeze to "wake up." In light airs, it can feel sluggish, particularly the twin-keel variant which suffers from increased wetted surface area. Under sail, the masthead rig is robust and forgiving, allowing for easy reefing from the cockpit—a feature that made it a popular choice for novice sailors transitioning from dinghies to cruisers.

Interior Comfort & Variations

For a 21-foot vessel, the Sunray 21 offers a remarkably functional interior, achieved through a wide beam and a clever use of GRP internal moldings. The standard layout features four berths: a double V-berth in the forward cabin and two long quarter berths extending aft under the cockpit seats. Unlike many "day sailers" of the 1970s, the Sunray 21 was designed with overnighting in mind, featuring a small galley area usually equipped with a two-burner stove and a compact sink.

The interior experience is defined by the era's use of teak-faced plywood and vinyl headliners. While headroom is limited to approximately 4 feet 8 inches, the "pop-top" hatch option—found on some specialized variants—offered standing room at the galley. The boat was produced alongside several siblings that shared its design DNA. The Sunstar 18 served as a smaller, more trailable alternative, while the Sunray 21 itself saw minor production variations when manufacturing transitioned between Cobramold and Intermarine Ltd. These variations were mostly cosmetic, involving different wood finishes or updated electrical panels, though the core hull and deck molds remained consistent across the production run.

Known Issues & Buyer’s Checklist

Prospective buyers of a Sunray 21 should focus on several high-signal areas typical of 1970s GRP construction. Technical discussions within vintage yachting communities frequently highlight "deck crunch," which occurs when the balsa or foam core of the deck sandwich deteriorates due to water ingress through poorly sealed stanchions or cleat bolts.

1. Window Sealing: The large acrylic side windows are a known weak point. Over decades, the rubber seals tend to perish, leading to leaks that can damage the interior woodwork.
2. Rudder Bushings: The skeg-hung rudder is sturdy, but the nylon or bronze bushings can wear down, leading to "play" or vibration in the tiller.
3. Compression Post: Inspect the area where the mast steps onto the deck. If the internal compression post has shifted or the support block has rotted, it can cause the deck to "dish," affecting rig tension.
4. Keel Bolts: On fin keel models, evidence of weeping or rust around the keel-to-hull joint should be scrutinized, as re-seating a 50-year-old keel is a significant undertaking.
5. Outboard Bracket: Most Sunray 21s are powered by outboards. The transom should be checked for "spiderweb" cracking or flexing, which indicates the laminate has been stressed by a heavy modern four-stroke engine.

Community & Resources

While Sun Yachts Ltd is no longer in operation, the legacy of the Sunray 21 is preserved through broader sailing networks. Because Arthur Howard designed both the Sunray and the Leisure series, owners often find technical overlap and support through the Leisure Owners Association, which maintains an extensive archive of Howard’s design principles and maintenance tips for similar GRP hulls of that era. Additionally, the maritime heritage of Gillingham and the Medway remains a hub for these vessels, with local clubs often hosting "classic plastic" rallies where Sunray owners congregate.

The Verdict

The Sunray 21 is a stout, honest pocket cruiser that trades performance for peace of mind. It is an ideal entry-level vessel for those navigating tidal waters or seeking a low-cost platform for coastal exploration.

Pros:

• Robust Construction: Thick GRP laminates and a skeg-hung rudder offer superior durability.
• Tidal Versatility: The twin-keel option allows the boat to sit upright on moorings that dry out.
• Internal Volume: Clever packaging provides four genuine berths in a 21-foot frame.
• Affordability: Low entry price and simple systems make it an economical choice for DIY sailors.

Cons:

• Light Air Performance: The heavy displacement makes it slow in sub-10 knot winds.
• Limited Headroom: Taller sailors will find the cabin cramped for extended stays.
• Aging Infrastructure: Many units require significant cosmetic and structural "refreshing" of decks and seals.