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505
Designer: John Westell/Austin Farrar  ·  Builder: Various  ·  First built: 1954
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About the 505

Originally designed by John Westell and Austin Farrar in 1954, this high-performance dinghy has become one of sailing's most celebrated racing classes with over 9,100 boats built worldwide. The 505's fractional sloop rig and centerboard configuration create an exceptionally responsive sailing machine that rewards skilled handling with exhilarating performance. At 16.5 feet overall with a relatively light 280-pound displacement, this boat delivers impressive speed potential with a sail area-to-displacement ratio of 65.49. The substantial 175 square feet of sail area provides plenty of power, while the 4.67-foot draft centerboard offers excellent upwind performance and shallow-water versatility. The 6.18-foot beam strikes an optimal balance between stability and speed. Built in both wood and fiberglass construction by various manufacturers, the 505 has maintained remarkably consistent design standards across its seven-decade production run. This boat excels in competitive fleet racing and spirited day sailing, particularly suited for experienced sailors who appreciate responsive handling and tactical sailing. The combination of its proven pedigree, active international racing circuit, and thrilling performance characteristics makes the 505 an outstanding choice for sailors seeking serious racing capability in a manageable package.

Core Dimensions
LOA (Length Overall) 16.50 ft / 5.03 m
LWL (Waterline Length) 15.00 ft / 4.57 m
Beam 6.18 ft / 1.88 m
Max Draft 4.67 ft / 1.42 m
Min Draft 0.50 ft / 0.15 m
Displacement 280.00 lb / 127 kg
Sail Area (Reported) 175.00 ft² / 16.26 m²
Design & Construction
Hull Type Centerboard Dinghy
Rigging Type Fractional Sloop
Construction Wood/FG
Designer John Westell/Austin Farrar
Builder Various
First Built 1954
Number Built 9100
Associations 505 Dinghy Class Assoc. (Int.)
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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
65.49
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
37.04
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
2.47
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
3.78
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. 5.19 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. 331.23 pounds/inch
How It Compares

vs. Lm 16, O Jolle, Tornado Texas

This boat Similar boats
Dimensions
LOA
505 ★
16.5 ft
Lm 16
16.4 ft
O Jolle
16.4 ft
Tornado Texas
16.4 ft
LWL
505 ★
15.0 ft
Lm 16
O Jolle
Tornado Texas
15.6 ft
Beam
505 ★
6.2 ft
Lm 16
6.6 ft
O Jolle
5.5 ft
Tornado Texas
5.6 ft
Displacement
505 ★
280 lbs
Lm 16
1 lbs
O Jolle
485 lbs
Tornado Texas
425 lbs
Sail Area
505 ★
175 sq ft
Lm 16
121 sq ft
O Jolle
Tornado Texas
160 sq ft
Performance
SA / Displacement (higher = more powerful)
505 ★
65.5
Lm 16
12.8
O Jolle
Tornado Texas
45.3
Comfort Ratio (higher = more comfortable offshore)
505 ★
2.5
Lm 16
16.0
O Jolle
5.3
Tornado Texas
4.2
Capsize Screening (lower = safer)
505 ★
3.78
Lm 16
O Jolle
Tornado Texas
2.97
Displacement / Length (lower = lighter)
505 ★
37
Lm 16
308
O Jolle
79
Tornado Texas
50
Hull Speed
505 ★
5.2 kts
Lm 16
5.0 kts
O Jolle
5.0 kts
Tornado Texas
5.3 kts
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