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Seafire
Designer: S. J. Herbert/J. V. Kelley  ·  Builder: South Devon Boatbuilders (Uk)  ·  First built: 1966
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About the Seafire

Designed by S. J. Herbert and J. V. Kelley in 1966, this compact 14-foot centerboard dinghy represents classic British small boat design philosophy from South Devon Boatbuilders. With its fractional sloop rig and 123 square feet of sail area, the Seafire delivers spirited performance despite its modest 190-pound displacement. The boat's relatively deep 3.84-foot draft suggests serious sailing capabilities uncommon in dinghies of this size. This substantial draft, combined with the centerboard configuration, provides excellent upwind performance while maintaining the versatility to explore shallow waters when the board is raised. The hull's proportions—with a beam of just under six feet—create a sleek profile that achieves a respectable hull speed of 4.92 knots. Built in either fiberglass or plywood construction, the Seafire suits both novice sailors learning boat handling and experienced sailors seeking responsive dinghy sailing. The high sail area to displacement ratio of 59.59 indicates lively performance in light to moderate conditions, making it ideal for day sailing, sailing instruction, and club racing. While the low comfort ratio of 2.02 confirms this is strictly a day sailor, the Seafire's design emphasizes pure sailing enjoyment over creature comforts.

Core Dimensions
LOA (Length Overall) 14.01 ft / 4.27 m
LWL (Waterline Length) 13.48 ft / 4.11 m
Beam 5.91 ft / 1.80 m
Max Draft 3.84 ft / 1.17 m
Min Draft 0.60 ft / 0.18 m
Displacement 190.00 lb / 86 kg
Sail Area (Reported) 123.00 ft² / 11.43 m²
Design & Construction
Hull Type Centerboard Dinghy
Rigging Type Fractional Sloop
Construction FG or Ply
Designer S. J. Herbert/J. V. Kelley
Builder South Devon Boatbuilders (UK)
First Built 1966
Associations Seafly Sailing Dinghy (UK)
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Performance Ratios
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
59.59
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
34.63
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
2.02
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
4.11
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. 4.92 kn
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. 284.66 pounds/inch
How It Compares

vs. International 14, Lido 14, Merlin Rocket

This boat Similar boats
Dimensions
LOA
Seafire ★
14.0 ft
International 14
14.0 ft
Lido 14
14.0 ft
Merlin Rocket
14.0 ft
LWL
Seafire ★
13.5 ft
International 14
14.0 ft
Lido 14
13.8 ft
Merlin Rocket
13.5 ft
Beam
Seafire ★
5.9 ft
International 14
6.0 ft
Lido 14
6.0 ft
Merlin Rocket
7.2 ft
Displacement
Seafire ★
190 lbs
International 14
164 lbs
Lido 14
310 lbs
Merlin Rocket
210 lbs
Sail Area
Seafire ★
123 sq ft
International 14
200 sq ft
Lido 14
111 sq ft
Merlin Rocket
Performance
SA / Displacement (higher = more powerful)
Seafire ★
59.6
International 14
106.9
Lido 14
38.8
Merlin Rocket
Comfort Ratio (higher = more comfortable offshore)
Seafire ★
2.0
International 14
1.7
Lido 14
3.2
Merlin Rocket
Capsize Screening (lower = safer)
Seafire ★
4.11
International 14
4.39
Lido 14
3.55
Merlin Rocket
Displacement / Length (lower = lighter)
Seafire ★
34
International 14
26
Lido 14
Merlin Rocket
38
Hull Speed
Seafire ★
4.9 kts
International 14
5.0 kts
Lido 14
5.0 kts
Merlin Rocket
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