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Snapdragon 24
Designer: Thames Structural Plastics/Thames Marine  ·  Builder: Thames Marine (Uk)  ·  First built: 1962
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About the Snapdragon 24

Designed and built by Thames Marine in the UK starting in 1962, this 24-footer represents classic British coastal cruising philosophy with its distinctive twin-keel configuration. The twin-keel design allows for convenient beaching and shallow-water exploration while maintaining reasonable sailing performance, making it particularly appealing for gunkholing and tidal waters where traditional deep-draft boats would be limited. With a displacement of 3,850 pounds and 1,550 pounds of ballast, the Snapdragon 24 offers solid stability for coastal adventures. The masthead sloop rig carries 247 square feet of sail area, providing adequate power for leisurely cruising while remaining manageable for small crews. Her 8-foot beam creates surprising interior volume for weekend getaways, while the fiberglass construction ensures durability with minimal maintenance requirements. The comfort ratio of 17.18 indicates this boat prioritizes seakindly motion over outright speed, typical of cruising-oriented designs from this era. Her capsize screening formula of 2.04 suggests she's best suited for protected waters and coastal sailing rather than offshore passages. Hull speed calculations show she'll cruise comfortably at moderate speeds, making her ideal for relaxed day sailing and short coastal hops rather than spirited performance sailing.

Core Dimensions
LOA (Length Overall) 24.50 ft / 7.47 m
LWL (Waterline Length) 20.50 ft / 6.25 m
Beam 8.00 ft / 2.44 m
Max Draft 2.50 ft / 0.76 m
Displacement 3,850.00 lb / 1,746 kg
Ballast 1,550.00 lb / 703 kg
Sail Area (Reported) 247.00 ft² / 22.95 m²
Design & Construction
Hull Type Twin Keel
Rigging Type Masthead Sloop
Construction FG
Designer Thames Structural Plastics/Thames Marine
Builder Thames Marine (UK)
First Built 1962
Associations Snapdragon; Mirage and Invaders Association
Related Sailboats Balaton 24 · Nutmeg 24 · East Wind 24 · Leisure 24 · Merit 25
Owner Reviews

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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
264
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
16.13
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
40.26
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
199.5
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
17.18
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
2.04
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 6.07 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
2.61
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 585.99 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 16.13
Rig Dimensions
I (Foretriangle Height) 29.08 ft / 8.86 m
J (Foretriangle Base) 8.50 ft / 2.59 m
P (Mainsail Luff) 24.66 ft / 7.52 m
E (Mainsail Foot) 10.00 ft / 3.05 m
SA Fore 123.59 ft² / 11.48 m²
SA Main 123.30 ft² / 11.45 m²
SA Total (100%) 246.89 ft² / 22.94 m²
Est. Forestay Length 30.30 ft / 9.24 m
How It Compares

vs. Balaton 24, East Wind 24, Leisure 24, Merit 25, Nutmeg 24

This boat Similar boats
Dimensions
LOA
Snapdragon 24 ★
24.5 ft
Balaton 24
24.4 ft
East Wind 24
24.6 ft
Leisure 24
24.5 ft
Merit 25
24.5 ft
Nutmeg 24
24.5 ft
LWL
Snapdragon 24 ★
20.5 ft
Balaton 24
21.2 ft
East Wind 24
20.0 ft
Leisure 24
22.0 ft
Merit 25
20.0 ft
Nutmeg 24
18.5 ft
Beam
Snapdragon 24 ★
8.0 ft
Balaton 24
7.6 ft
East Wind 24
7.1 ft
Leisure 24
9.3 ft
Merit 25
8.0 ft
Nutmeg 24
7.6 ft
Displacement
Snapdragon 24 ★
3 lbs
Balaton 24
4 lbs
East Wind 24
4 lbs
Leisure 24
4 lbs
Merit 25
2 lbs
Nutmeg 24
3 lbs
Ballast
Snapdragon 24 ★
1 lbs
Balaton 24
1 lbs
East Wind 24
2 lbs
Leisure 24
Merit 25
1 lbs
Nutmeg 24
1 lbs
Sail Area
Snapdragon 24 ★
247 sq ft
Balaton 24
274 sq ft
East Wind 24
316 sq ft
Leisure 24
280 sq ft
Merit 25
Nutmeg 24
Performance
PHRF Rating (lower = faster)
Snapdragon 24 ★
264 s/nm
Balaton 24
East Wind 24
Leisure 24
Merit 25
171 s/nm
Nutmeg 24
SA / Displacement (higher = more powerful)
Snapdragon 24 ★
16.1
Balaton 24
16.9
East Wind 24
18.3
Leisure 24
15.7
Merit 25
Nutmeg 24
Ballast / Disp (higher = stiffer)
Snapdragon 24 ★
40.3 %
Balaton 24
36.8 %
East Wind 24
Leisure 24
Merit 25
36.2 %
Nutmeg 24
38.8 %
Comfort Ratio (higher = more comfortable offshore)
Snapdragon 24 ★
17.2
Balaton 24
19.8
East Wind 24
24.5
Leisure 24
17.0
Merit 25
Nutmeg 24
Capsize Screening (lower = safer)
Snapdragon 24 ★
2.04
Balaton 24
1.88
East Wind 24
1.71
Leisure 24
2.19
Merit 25
Nutmeg 24
Displacement / Length (lower = lighter)
Snapdragon 24 ★
199
Balaton 24
197
East Wind 24
Leisure 24
203
Merit 25
161
Nutmeg 24
267
Hull Speed
Snapdragon 24 ★
6.1 kts
Balaton 24
6.2 kts
East Wind 24
6.0 kts
Leisure 24
6.3 kts
Merit 25
Nutmeg 24
Speed Number (higher = faster)
Snapdragon 24 ★
2.6
Balaton 24
East Wind 24
2.2
Leisure 24
Merit 25
Nutmeg 24
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