Design and Construction
The hull is solid fibreglass, hand-laid in the heavy GRP tradition Thames Marine used throughout its 1960s and 1970s production. The Snapdragon 21 was built by the British yard Thames Marine Ltd.
She measures 21 feet overall, with a beam of 7.25 feet and an l/b ratio of 2.90. Displacement is 2,200 lbs, including 950 lbs of iron ballast. Her 43% ballast ratio and displacement-length ratio of 168 support the light-racer classification, while a Motion Comfort Ratio of 12.8 suggests a brisk motion. Wetted bottom area is about 129 square feet, and immersion is 455 lbs per inch.
Snapdragon decks from the 1960s and 1970s typically used plywood or balsa coring. On an older example, this warrants a survey for delamination, although no such defect is attributed specifically to the Snapdragon 21.
Rig and Handling
The Snapdragon 21 carries a masthead sloop rig with 188 square feet of sail and a sail-area-to-displacement ratio of 17.79. Her theoretical hull speed is 5.7 knots, and the capsize screening value is 2.23.
Jib and genoa sheets are 21 feet of 3/8-inch line. The mainsheet is 52.5 feet long, and the spinnaker sheet is 46.2 feet.
Depending on load, the bilge keels keep draft between 2.49 and 2.79 feet. As a result, the boat can enter even shallow marinas that would ground a deeper-draft boat. The twin keels also allow her to dry out level.
Accommodation
The narrow beam and 21-foot overall length limit the accommodation to minimal coastal camping. This is a compact coastal cruiser rather than a boat with generous living space.
Refits and Ownership
Thames Marine stopped manufacturing in 1981. Maplin Marine briefly continued distribution before also closing.
For a boat whose production began in 1970, the solid hull should survive well, but the original deck coring and period rigging are usual refit items. Her shoal draft also makes her an easy candidate for a drying mooring.
Verdict
The Snapdragon 21 is a tidy British bilge-keeler. Her light-racer numbers, shoal draft, and simple rig make her an accessible coastal sailor, provided buyers accept the limited accommodation and brisk motion.
Pros
- Shoal bilge-keel draft of 2.49–2.79 feet allows access to shallow marinas and lets the boat dry out level
- Light-displacement proportions and a 17.79 SA/D suggest lively performance
- Solid fibreglass hull, built in Thames Marine’s heavy, hand-laid tradition
Cons
- Narrow beam and 21-foot length limit accommodation to minimal coastal camping
- A 12.8 Motion Comfort Ratio indicates a brisk rather than gentle motion
