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Seagull 18
Designer: Ian Proctor  ·  Builder: Bell Woodworking (Uk)  ·  First built: 1956
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About the Seagull 18

A compact and nimble daysailer, the Seagull 18 is designed with accessibility and fun at its core. Built for sheltered waters, lakes, and calm coastal sailing, this boat appeals to beginners looking to develop their skills as well as experienced sailors seeking a low-maintenance vessel for casual weekend outings. With its manageable size, the Seagull 18 is easy to trailer, launch, and handle with a small crew or even single-handed, making it a practical choice for sailors who value simplicity and convenience. Its modest dimensions keep running costs low while still delivering an enjoyable time on the water. While detailed specifications are limited, the Seagull 18 fits neatly into the category of entry-level and recreational sailboats that prioritize ease of use over offshore ambition. Buyers drawn to this boat are typically looking for a reliable platform to enjoy relaxed sailing without the complexity of a larger vessel. For those stepping into sailboat ownership or seeking an uncomplicated second boat for daysailing, the Seagull 18 is worth a closer look.

Core Dimensions
LOA (Length Overall) 18.50 ft / 5.64 m
LWL (Waterline Length) 17.25 ft / 5.26 m
Beam 6.75 ft / 2.06 m
Max Draft 3.75 ft / 1.14 m
Displacement 1,680.00 lb / 762 kg
Ballast 350.00 lb / 159 kg
Design & Construction
Hull Type Keel/Cbrd.
Rigging Type Masthead Sloop
Construction plywood, hard chine
Designer Ian Proctor
Builder Bell Woodworking (UK)
First Built 1956
Number Built 400
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Performance Ratios
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
20.83
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
146.11
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. 2.5 pounds/inch
Rig Dimensions
I (Foretriangle Height) 1.42 ft / 0.43 m
P (Mainsail Luff) 215.00 ft² / 19.97 m²
E (Mainsail Foot) 146.11
How It Compares

vs. Alacrity 19, Minuet, Peregrine Proctor

This boat Similar boats
Dimensions
LOA
Seagull 18 ★
18.5 ft
Alacrity 19
18.5 ft
Minuet
18.3 ft
Peregrine Proctor
18.5 ft
LWL
Seagull 18 ★
17.3 ft
Alacrity 19
17.0 ft
Minuet
12.8 ft
Peregrine Proctor
17.3 ft
Beam
Seagull 18 ★
6.8 ft
Alacrity 19
6.9 ft
Minuet
5.4 ft
Peregrine Proctor
5.6 ft
Displacement
Seagull 18 ★
1 lbs
Alacrity 19
1 lbs
Minuet
1 lbs
Peregrine Proctor
720 lbs
Ballast
Seagull 18 ★
350 lbs
Alacrity 19
480 lbs
Minuet
420 lbs
Peregrine Proctor
375 lbs
Performance
Ballast / Disp (higher = stiffer)
Seagull 18 ★
20.8 %
Alacrity 19
32.0 %
Minuet
42.0 %
Peregrine Proctor
52.1 %
Displacement / Length (lower = lighter)
Seagull 18 ★
146
Alacrity 19
136
Minuet
211
Peregrine Proctor
61
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