Design Brief & Intent
The Sun 27 was conceived as an accessible, high-volume coastal cruiser designed to capture the booming entry-level market of the late 1970s. The builder’s mandate was clear: deliver a production-line fiberglass sloop that offered the interior volume of a thirty-footer in a handier, more affordable footprint. Unlike the heavy, long-keeled traditional cruisers dominating the era, the Sun 27 was engineered to be responsive in light summer airs and nimble enough to navigate tight marina slips.
Inside, the boat utilized a practical layout optimized for pocket cruising. Despite its modest length, the cabin featured a classic V-berth forward, a compact marine head, opposing salon settees, a small galley, and a quarter berth. To keep production costs low, early builders like Reinell used simplified plywood joinery and modular fiberglass liners, though subsequent production runs by Spencer Boats in British Columbia elevated the joinery with richer teak trim and more robust cabinet construction 3. The interior felt bright and airy, a direct result of Perry's raised-deck profile, which dramatically improved headroom and lateral cabin space.
Variations & Configurations
Throughout its production run from 1977 to 1980, the Sun 27 underwent several key modifications that altered both its designation and configuration. The earliest hulls built by Reinell in Washington state were offered primarily as masthead sloops with an iron fin keel and a spade rudder, designed to draw around four feet and four inches. While early models preserved a transom-mounted outboard well as a nod to economy, many buyers opted for the inboard auxiliary diesel configuration, which typically featured a small, raw-water-cooled Yanmar engine.
When the design’s production shifted across the border to Spencer Boats in Canada during the early 1980s, the model was refined and occasionally marketed under the Sunstar 28 nameplate. These later Spencer-built hulls generally commanded a premium due to their superior glasswork and upgraded amenities, including dedicated propane lockers and a slightly extended transom that altered the overall length. Additionally, while the standard masthead rig remained the default, some late-production examples featured taller rigs designed to maximize performance in light wind regions.
Sailing Performance & Handling
On the water, the Sun 27 is characterized by balanced, predictable handling that reflects the pragmatic instincts of both Monk and Perry. With a displacement of 6,200 pounds and a ballast-to-displacement ratio of 37.1 percent, the boat carries 2,300 pounds of ballast low in its fin keel. This configuration provides a reassuring level of stiffness, enabling the boat to stand up to its sail plan when the breeze builds. A displacement-to-length ratio of 242.99 places the Sun 27 firmly in the moderate displacement cruiser category—heavy enough to carry momentum through a chop but light enough to remain lively.
Under canvas, a sail area-to-displacement ratio of 16.12 indicates a sail plan that is efficiently sized for typical coastal conditions. While not a flat-out racing machine, it performs admirably to windward and behaves predictably when off the wind. Its capsize screening ratio of 1.96 sits just under the critical threshold of 2.0, verifying that the hull form possesses a fundamentally safe righting capability for coastal and nearshore passages. Helming the boat is an uncomplicated affair; the spade rudder offers immediate helm response, though the motion comfort ratio of 21.39 signals a light-ship motion profile that is typical for its class, meaning crew members will feel the motion of the sea more than they would on a heavier, dedicated offshore cutter.
Market Snapshot & Economics
Decades after the last hull left the yard, the Sun 27 exists as a highly attractive value proposition on the used market. Because of its budget-friendly entry price and simple systems, it is heavily favored by first-time buyers, DIY enthusiasts, and club racers looking for low-overhead sailing. Hulls built during the Reinell era are widely distributed across the Pacific Northwest and the Great Lakes, though they generally trade at a discount compared to the rarer, more highly finished Spencer-built versions.
From an economic perspective, potential owners must weigh the purchase price against the inevitable costs of structural and mechanical triage. On a boat of this vintage, standard refitting expenses—such as replacing aging standing rigging, purchasing new sails, or servicing an original raw-water-cooled engine—can quickly equal or exceed the vessel's initial acquisition cost. However, because the boat’s core systems are straightforward and easily accessible, it remains a highly forgiving platform for amateur refits.
Known Issues & Triage
Like many production fiberglass boats from the late 1970s, the Sun 27 has a few documented trouble areas that require close inspection. The most common structural issue involves the deck construction. The balsa-cored fiberglass decks are susceptible to freshwater ingress around high-stress areas such as the stanchion bases, chainplates, handrails, and the mast step. Over time, failure to maintain these caulked joints leads to core rot and soft spots, demanding a labor-intensive recoring process.
The iron fin keel also presents maintenance challenges. Unlike lead, cast iron is prone to rust if the epoxy barrier coat is compromised. Owners must monitor the keel-to-hull joint for signs of shifting or water entry. Checking the torque on the mild steel keel bolts and treating rust spots on the ballast package are mandatory seasonal maintenance chores. Additionally, because the deck-stepped mast puts considerable downward pressure on the deck, the internal compression post and the floor structure supporting it must be thoroughly inspected for compression crack signs or moisture damage.
Modernization & Upgrades
Modern owners are increasingly choosing to upgrade the Sun 27 to align with contemporary sailing standards. One of the most popular retrofits is the electrical system. The original, sparse 12-volt DC setups are frequently replaced with simplified marine lithium iron phosphate (LiFePO4) battery banks, which provide ample power to run modern electronics, refrigeration, and USB charging ports without adding unnecessary weight.
Drivetrain upgrades are another major area of investment. For boats with tired or seized original Yanmar engines, repowering with a modern, fresh-water-cooled diesel engine is a common choice, though some owners have successfully converted the boat to electric propulsion. Because the boat’s sailing habits are mostly day-sailing and short coastal hops, a small electric motor paired with a modest battery bank provides a quiet, low-maintenance alternative to diesel power. Finally, upgrading to a modern roller furling genoa and installing a lazyjack system significantly improves single-handed handling, transforming this vintage cruiser into an exceptionally easy boat to manage alone.
The Verdict
The Sun 27 is a well-conceived, historically significant pocket cruiser that successfully blends the design genius of Edwin Monk Jr. and Robert Perry. While its budget-oriented construction requires a discerning eye during the pre-purchase survey, its stable sailing characteristics, spacious raised-deck interior, and predictable handling make it an exceptional platform for coastal exploration. For sailors seeking maximum living space and reliable performance on a modest budget, this classic design remains a compelling choice.
Pros
- Generous headroom and interior volume for a 27-foot boat, thanks to the Perry-designed raised deck profile.
- Stiff and stable under sail, backed by a generous ballast ratio.
- Highly responsive helm and nimble handling in tight quarters.
- Simple, accessible mechanical and electrical systems that favor owner-performed maintenance.
Cons
- Balsa-cored decks are highly vulnerable to moisture rot if deck fittings are not periodically re-bedded.
- Cast iron keel requires constant vigilance against corrosion and rust compared to lead alternatives.
- Small original fuel and fresh-water capacities limit the boat's range for extended cruising.
- Original raw-water-cooled inboard engines are often at the end of their service life and expensive to replace.
