The Corvette was the smallest in a family that grew to include the 36-foot Frigate and 40-foot Crusader. She was designed to the C.C.A. rule, which then rewarded heavy displacement and shoal draft in a single coastal cruiser-racer.
Design and Construction
Even today, the Corvette looks traditional, with a relatively narrow beam, long overhangs, a graceful sheer, and a long keel. She measures 31 feet 2½ inches overall and 22 feet 6 inches on the waterline, with a beam of 9 feet 1 inch. Displacement is 8,545 lbs.
Her 4,000 lbs of ballast takes the form of bolt-on lead just forward of the centreboard. In that position, it absorbs the hard knock of grounding in the shoal waters the boat was designed to sail. With the centreboard raised, draft is 3 ft 3 in; with it lowered, draft increases to 7 ft. The centreboard trunk sits within the keel and doesn’t intrude into the accommodation above the floorboards.
The Corvette has wide decks, outboard shrouds, a large foredeck, and a moderately sized deckhouse. Early boats were built with balsa-core decks, an early use of fiberglass/core technology. The hull was left unlined, making later access to the structure straightforward.
Rig, Cockpit, and Handling
The masthead rig carries a moderate 444 sq. ft. of sail, divided almost evenly between the mainsail and fore triangle. The tiller rises from the sole of the eight-foot cockpit, which has straight benches.
The design proved quick on the race course. In the 1968 Lipton Cup off Miami, sailed in fluky 5-to-10-knot air, Elektra finished first in Class D and 24th in a fleet of more than 100. Later that season, Elektra II placed second overall in the 184-mile Miami-Nassau race.
The principal handling caveat is the shallow rudder. When the boat is pushed hard on a broad reach in brisk winds, the rudder can lose control, making broaches common.
Accommodations
Below, the Corvette provides standing headroom and four berths, with the ability to sleep as many as five people. The interior is spartan but functional. Along with the eight-foot cockpit and moderate deckhouse, the layout suits a couple or small family more than a crew seeking lavish cruising comfort.
Engine and Owner Modifications
Every Corvette left the yard with a Universal Atomic 4 gasoline engine and direct drive. Some owners have converted their boats to diesel. Others have fitted a reduction gear to the Atomic 4, allowing a larger-diameter propeller to turn more slowly for greater push.
The boats are trailerable with daytime wide-load permission. A loyal and active owners association also supports the class.
Known Issues and Maintenance
Some owners report rotting deck core caused by inadequate backing pieces and sealing. Because the hulls weren’t lined, however, cutting out the fiberglass and damaged core from below decks is an easy job.
Many owners have found that, after twenty years, the ferrous centreboard must be removed for rust treatment and a protective coating. The centreboard pins and pennant also need replacement.
The shallow rudder’s tendency to let go when the boat is driven hard on a broad reach remains the main handling concern.
The Verdict
The Corvette 31 is a thoughtfully conceived shoal-draft cruiser-racer. Her CCA rule pedigree produced a heavy, well-ballasted hull that sails capably in light air and holds up offshore, with a proven racing record in mixed light and heavy air. Centreboard versatility, straightforward structure, and an active class community make her a practical classic. The trade-offs are deck-core rot, regular maintenance of the ferrous centreboard, and a spartan interior.
Pros
- Shoal 3 ft 3 in draft with the board up and 7 ft with it down, providing versatility for gunkholing
- Well-ballasted lead keel positioned to withstand grounding
- Proven racing record in mixed light and heavy air
- Unlined hull makes internal repairs easier
Cons
- Balsa-core deck prone to rot from poor sealing
- Ferrous centreboard and pins require an overhaul after two decades
- Shallow rudder invites broaches on hard broad reaches
- Spartan interior by modern standards
