Design Brief & Intent 2
The Impala 28 was designed to challenge the prevailing cruiser-racer norms of the late 1970s, aiming directly at heavier, more traditional competitors like the Westerly GK29 and the Contessa 28. David Thomas’s mandate was to create a yacht that was inexpensive to build, easy to maintain, and blisteringly fast on all points of sail, yet seaworthy enough to handle offshore passages in the English Channel and North Sea. The builder achieved this by stripping away unnecessary heavy joinery and structural fluff, focusing instead on a lightweight, stiff, and hydrodynamically clean platform.
The character of the interior reflects this performance-first philosophy. Stepping below, the layout is starkly minimalist and highly functional, featuring a clean fiberglass headliner and structural marine-plywood bulkheads. Headroom is restricted, as the low-profile cabin trunk was designed to minimize windage and maintain a low center of gravity. Accommodation is surprisingly practical for a racing crew, consisting of a simple twin-berth forepeak, a compact midships heads compartment to port, and a spartan galley aft of the main bulkhead. The saloon utilizes a clever design where the main settee berths extend underneath the cockpit seats. Crucially, the settee backrests are engineered on block-and-tackle systems to hinge upward, creating two secure, suspended pilot berths outboard. This arrangement provides up to six functional berths, ensuring that off-watch racing crew can sleep comfortably on the high side during grueling distance races.
Variations & Configurations
The primary production variants of the Impala 28 revolve around propulsion and steering updates. Early hulls were delivered with a pivoting outboard engine system situated in a central stern locker. This configuration allowed the outboard to be raised completely out of the water and swung back into its own locker, with a flush-fitting blanking plate sealing the hull aperture to eliminate drag. To satisfy cruisers and offshore racers demanding greater mechanical reliability, the "Impala 28-2" configuration emerged, standardizing a single-cylinder, 9-horsepower Yanmar inboard diesel engine driving a folding two-blade propeller. The class association famously managed this transition by requiring outboard-powered boats to carry internal lead corrector weights to standardize the fleet's rating, ensuring both configurations could race on a true level rating.
The underwater profile of the yacht is uniform, featuring a deep, high-aspect-ratio fin keel drawing over five and a half feet, paired with a transom-hung rudder. The rudder itself represents the other major structural variation. Originally delivered as a timber blade, the steering was substantially modernized in the year 2000 when David Thomas designed the Mark II rudder. Built of fiberglass, the Mark II blade is six inches deeper than the original and features an optimized hydrodynamic foil shape that dramatically improves grip, particularly when sailing in breezy, high-load downwind conditions.
Sailing Performance & Handling
The sailing dynamics of the Impala 28-2 are defined by its light, easily driven hull and highly adjustable fractional rig. With a displacement of 5,556 pounds, the hull responds instantly to wind shifts and sail trim adjustments. A displacement-to-length ratio of 199.41 places the boat on the lighter side of the medium-displacement spectrum, indicating a hull that accelerates rapidly in light winds and exhibits an eagerness to surf downwind in a blow. The sail area-to-displacement ratio of 17.08 speaks to a well-balanced power-to-weight ratio that provides ample driving force without becoming unmanageable for a short-handed crew.
On the water, the Impala is highly responsive and behaves like a dinghy on a grand scale. It is an exceptional upwind pointer, utilizing its deep fin keel to generate massive lift. However, with a ballast-to-displacement ratio of 33.77%, the boat prefers to be sailed relatively flat. Active mainsail and backstay adjustment are required to bend the mast and flatten the sails as the breeze builds, preventing excessive heel. The capsize screening ratio of 2.09 indicates a relatively narrow, light-displacement design that requires active helming and proper reefing protocols in heavy weather. A comfort ratio of 18.01 tells the story of a lively, motion-rich ride; the boat does not possess the heavy momentum to plow through chop, but rather climbs over it, resulting in a wet but exhilarating and remarkably seaworthy passage. The yacht's blue-water credentials are well-proven, highlighted by several transatlantic crossings and successful solo circumnavigations of the British Isles.
Known Issues & Triage
Decades of hard campaign racing and coastal cruising have exposed a few well-documented structural vulnerabilities that prospective buyers should investigate.
- Keel Floor Flexing: The fiberglass laminate in the bilge area immediately above the fin keel can exhibit flexing. This issue is often exacerbated by hard groundings or the high rigging loads associated with racing. Triage involves a close inspection of the bilge floors for stress cracks; many owners have successfully resolved this by laminating additional glass-reinforced plastic grid structures to reinforce the keel sump.
- Chainplate Movement and Leaks: The original stainless steel chainplates are relatively thin and short, secured by 8mm bolts. Under heavy rig tension, these plates can creep upward, breaking the deck sealant and allowing water to penetrate the deck core and rot the structural bulkheads. The accepted fix is to replace them with custom, heavy-duty 316 stainless steel plates extended to 400mm or 500mm in length, which allows for more fastening bolts to distribute the loads over a wider area of the bulkhead.
- Rudder Blade and Pintle Wear: The original timber rudders are prone to split joints and cross-grain fractures near the waterline under high loads. Additionally, the transom-hung rudder pintle clamp can stretch and slip, occasionally allowing the rudder rod to pop out of its lower bracket. Buyers should check for any play in the gudgeons and look for water ingress or splits in the wood.
Modernization & Upgrades
The active global community and dedicated class association have fostered a robust culture of refitting and modernizing the Impala 28.
- Mark II Rudder Retrofit: Upgrading to the David Thomas-designed GRP Mark II rudder is widely considered the single most impactful modernization project. The extra depth and refined shape prevent the boat from spinning out or rounding up during heavy-air spinnaker reaches, vastly improving safety and control.
- Drivetrain Repowering: Many owners have replaced aging or poorly installed early-generation engines with modern Yanmar 1GM10 diesels. This swap often includes replacing worn stern glands, upgrading to two-blade folding propellers to reduce drag, and modifying the bilge layout to improve access for routine maintenance.
- Rigging and Deck Layout: Modernized Impalas frequently feature upgraded Dyneema running rigging, twin Dyneema backstays, and full-width mainsheet travelers to facilitate precise sail controls. Cruising-oriented owners often extend the forepeak bunks, replace the original leaky forward hatches, and install custom bowsprits to easily fly modern asymmetric spinnakers or code sails.
The Verdict
The Thomas Impala 28-2 remains a masterclass in functional, high-performance yacht design. It is a boat that rewards skilled helmsmanship and active sail trimming, offering a level of sailing excitement and structural integrity that few modern pocket cruisers can match. While its spartan accommodations and lack of standing headroom make it unappealing for those seeking a floating cottage, its sparkling performance, legendary class support, and highly accessible entry price make it an unbeatable choice for club racers and purist coastal cruisers.
- Exquisite, dinghy-like handling with exceptional upwind pointing and thrilling downwind surfing capability.
- Outstanding, highly supportive class association providing a wealth of technical resources, spare parts guides, and competitive racing opportunities.
- Cleverly engineered six-berth interior layout utilizing space-saving under-cockpit settees and secure pilot berths.
- Robust, straightforward construction that responds exceptionally well to owner-led refits and modernizations.
- Highly competitive under IRC and one-design handicap systems, offering massive performance per dollar.
- Spartan living quarters with restricted headroom and minimal creature comforts.
- Known structural flexing in the keel floor and original chainplates that require inspection and eventual reinforcement.
- Original timber rudders are prone to fracturing and stalling under heavy loads, necessitating an expensive Mark II GRP replacement.
- Active, lively motion in a seaway can be physically demanding on the crew during long, heavy-weather passages.
