Design and Construction
Thames Marine built the 747 in the United Kingdom as a predominantly glassfibre hull carrying wood trim, with a raked stem and a plumb transom that together read as a compact, no-nonsense coastal profile rather than a racer's wedge. The structural story is one of conservative mass: at 3,700 pounds displacement with 1,550 pounds of ballast, the boat sits at a ballast-to-displacement ratio near 42 percent, a figure that places her firmly in the stable-cruiser camp rather than the featherweight trailerable fringe. Her standard fixed twin keels draw just 2.50 feet, while the optional fin keel extends that to 3.50 feet, giving buyers a genuine choice between rock-hopping shoal draft and a slightly deeper, more directional keel plan. The skeg-mounted rudder controlled by a tiller, introduced as a deliberate departure from the 24, anchors the steering gear behind a protective skeg rather than exposing it to full leading-edge flow.
Rig and Handling
The 747 wears a Bermuda masthead sloop rig, the same broad categorisation as her parent 24 but with the modified rig that the builder deemed worth noting as a defining change. At a length overall of 24.50 feet over a 20.50-foot waterline and an 8.00-foot beam, the hull form is short but proportionately broad, and the twin-keel shoal draft keeps her upright on drying moorings or shallow estuaries where a fin-keel sibling could not follow. The Japanese Yanmar YS 8 diesel fitted aboard is sized for docking and manoeuvring rather than passage-making, a candid acknowledgment that this is a sail-first 3,700-pound cruiser whose engine exists to ease her into berths rather than to drive her offshore.
Accommodations
Below, the 747 is laid out to sleep four without pretense of excess. A double V-berth occupies the bow cabin, while the main cabin holds an L-shaped settee and the starboard side carries an aft quarter berth, distributing bodies across three distinct zones so a small crew can coexist without stacking. The galley sits on the starboard side just aft of the bow cabin, with the head placed opposite on the port side in the same forebody band—a split that keeps wet and dry functions separated along the centerline while leaving the main cabin free as social space. For a boat of 24.50 feet overall this is a studied, if compact, four-berth arrangement rather than a compromised afterthought.
Known Issues
The documented facts on the 747 are unusually clean of defect reporting: no structural rot, no rigging fatigue, no flooding paths, and no drainage faults are recorded in the authority extracts available. What survives instead is the simple statement that the design is now out of production, with over 350 boats completed by 1976—a production scale that implies a mature, repeatable mould rather than a brief manufacturing run. The absence of cited failures should not be read as a warranty, but it does mean the shopper's risk profile on this model is defined by age and ownership history rather than by a known systemic weakness in the class.
Refits and Ownership
Ownership of a 747 is buffered by an active class club, the Snapdragon, Mirage and Invaders Association, which keeps the marque's varied 1960s and 1970s output connected long after Thames Marine ceased building. Because the boat was built predominantly of solid glassfibre with wood trim, the refit conversation naturally centres on the timber accents and the Yanmar YS 8 rather than on cored-deck remediation, and the trailerable premise means a used example may arrive having spent years on a road rather than in a brine. The class club is the practical continuity a 1964-origin design needs once the original builder is gone.
The Verdict
The Snapdragon 747 is a compact, trailerable British cruiser that traded the Snapdragon 24's early rudder arrangement for a skeg-mounted tiller steer and a modified masthead sloop rig, then backed it with solid-glassfibre construction and a four-berth interior that respects the boat's 24.50-foot length. She is a stable, shoal-friendly pocket cruiser with an active support network, not a performance boat.
Pros
- Twin-keel 2.50-foot draft makes her genuinely trailerable and shoal-capable
- Four-berth layout with separated galley and head is efficient for the size
- Active class club sustains parts, knowledge, and ownership community
Cons
- Yanmar YS 8 is docking-only, not a passage auxiliary
- Out of production with builder long ceased, so support is club-dependent
- Optional fin keel raises draft to 3.50 feet, eroding trailerable advantage
