Snapdragon 29 Information, Review, Specs

Snapdragon 29 Drawing
Make
Snapdragon
Model
29
Builder
Thames Marine
Designer
Thames Structural Plastics/Thames Marine
Number Built
Production Year(s)
1971 - ??

The Snapdragon 29 represents the pinnacle of Thames Marine’s "maximum volume" design philosophy, serving as the flagship cruiser for the Essex-based builder during the peak of the 1970s fiberglass boom. Designed primarily by the company's founders, Ray Walsh and Len Wakefield, the 29 was engineered to provide the living space of a much larger vessel within a manageable, sub-30-foot footprint. As a larger sibling to the ubiquitous Snapdragon 21 and 24, the 29-foot model targeted families who required standing headroom and dedicated separate cabins for coastal cruising. Its heavy-displacement hull and characteristic bilge keels were specifically tailored for the tidal estuaries of the British East Coast, where the ability to dry out in a muddy berth was more prized than outright racing speed.

Sailing Performance & Handling

The Snapdragon 29 is a quintessential "motor-sailer" in spirit, if not in name. With a high displacement and relatively modest sail area, it is not a boat that excels in light airs. However, as noted in historical reviews by the Snapdragon Mirage and Invaders Association, the boat is remarkably stiff and reassuring when the wind picks up. The hull’s generous beam and heavy ballast ratio provide a high degree of initial stability, making it an excellent platform for nervous sailors or families with young children.

Handling is dominated by its twin-keel configuration. While these bilge keels allow the boat to stand upright on a falling tide, they do introduce significant leeway when sailing close-hauled compared to a deep-fin keel alternative. Owners typically report that the boat "points" about 5 to 10 degrees lower than contemporary performance cruisers like the Sigma 29. Tracking is generally good due to the longish lateral plane of the keels, though the boat can be somewhat heavy on the helm when over-canvassed. Under power, the original fitment was often a Bukh or Yanmar diesel; because of the high windage of the coachroof, maneuvering in a crosswind requires decisive throttle work, as the bow tends to blow off quickly at low speeds.

Interior Comfort & Variations

The interior of the Snapdragon 29 is where the model truly outshines its competitors from the era. By utilizing a high-volume hull with significant freeboard, Thames Marine achieved a level of cabin comfort that was revolutionary for the time. The layout typically features five or six berths, including a double V-berth in the forward cabin, a convertible dinette in the saloon, and a generous quarter berth to starboard.

One of the boat's most significant selling points is its 6-foot-plus headroom, which extends through most of the main saloon. The galley is usually situated to port, featuring a cooker, sink, and surprisingly deep storage lockers for a boat of this vintage. Toward the end of the production run, Thames Marine introduced the Snapdragon 890, which was essentially a refined version of the 29 with updated interior moldings and a slightly modified deck layout to improve ergonomics. Another sibling, the Snapdragon 747, offered a similar aesthetic in a smaller package, but the 29 remains the preferred choice for those intending to spend more than a weekend aboard. The use of mahogany-faced marine plywood and thick GRP (glass-reinforced plastic) liners gives the interior a robust, traditional feel, though it can feel somewhat dark by modern standards due to the small, aluminum-framed windows.

Known Issues & Buyer’s Checklist

Prospective buyers of a Snapdragon 29 should approach the purchase with a focus on the structural integrity of the hull and the condition of the original systems. According to technical discussions within the Snapdragon Mirage and Invaders Association, several "gotchas" are common to this model:

  • Osmosis: Like many early British fiberglass boats built before the widespread use of isophthalic resins, Snapdragons are prone to osmotic blistering. While rarely structural, it can be a significant negotiation point.
  • Window Leaks: The original toughened glass windows set in aluminum frames are notorious for leaking. Over decades, the sealants fail, often leading to rot in the interior wood bulkheads directly beneath the ports.
  • Keel Bolts: On the twin-keel models, the stresses of drying out twice a day can lead to hairline cracks in the GRP around the keel stubs. Buyers should inspect the internal glassing around the keel floors for signs of movement or weeping.
  • Mast Step Compression: The mast is deck-stepped and relies on a wooden compression post or bulkhead support inside the cabin. If water has ingressed into the deck core or if the support has shifted, the deck may show a "dished" appearance under the mast foot.
  • Engine Access: While the engine is located under the cockpit sole, access for major repairs is notoriously tight. Checking the condition of the engine mounts and the stern gland is essential, as these are difficult areas to reach for maintenance.

Community & Resources

The primary hub for technical data, sail plans, and community support is the Snapdragon Mirage and Invaders Association. This group maintains an extensive archive of original brochures and technical manuals, which are invaluable for owners looking to restore these vessels to their original specifications. Because the Snapdragon 29 was built in relatively high numbers for its time, there remains a healthy secondary market for parts and advice, particularly in the United Kingdom.

The Verdict

The Snapdragon 29 is a rugged, honest cruising yacht that prioritizes living space and safety over speed. While it will never win a regatta, its ability to navigate shallow waters and provide a comfortable "home away from home" makes it an enduring favorite for coastal explorers on a budget.

Pros:

  • Immense interior volume and headroom for its length.
  • Shallow draft and bilge keels allow for tidal beaching.
  • Heavily built, reassuring hull in heavy weather.
  • Excellent value for money on the used market.

Cons:

  • Sluggish performance in light winds.
  • Poor close-hauled pointing ability.
  • Prone to osmosis and window leaks if not maintained.
  • High windage makes close-quarters berthing a challenge.

Measurements

Construction & Hull

Construction Material
Fiberglass
Hull Type
Monohull Sailboat
Keel Type
Twin
Rudder
1x —
Ballast
3000 lbs
Displacement
7500 lbs
Water Capacity
-
Fuel Capacity
-

Dimensions

Length Overall (LOA)
29 ft
Waterline Length (LWL)
24 ft
Beam
9.5 ft
Draft
3.25 ft
Max Headroom
-
Air Draft
-
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Masthead Sloop
P (Main Luff)
-
E (Main Foot)
-
I (Foretriangle Height)
-
J (Foretriangle Base)
-
Forestay Length (est)
-
Sail Area
300 sqft

Calculations

Sail Area / Displacement (SA/D) Ratio
12.53
Ballast / Displacement Ratio
40
Displacement / Length Ratio (D/L) Ratio
242.2
Comfort Ratio
22.66
Capsize Screening Formula
1.94
Hull Speed
6.56 kn