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Sailboat Specifications

Islander 21

Masthead Sloop · Fin W/Spade Rudder

Designed by J. H. Mcglasson · Built by Mcglasson Marine/Wayfarer Yachts Corp. (Usa) · First built 1965

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LOA 20.82 ft  ·  Beam 7.83 ft  ·  Displacement 1,950.00 lb  ·  Sail Area 215.00 ft²  ·  Masthead Sloop  ·  Fin W/Spade Rudder
About the Islander 21 Sailboat

Designed by J.H. McGlasson and first launched in 1965, this compact 21-footer represents classic small boat design from sailing's golden era. Built by McGlasson Marine and later Wayfarer Yachts Corp., the Islander 21 combines traditional proportions with modern fin keel efficiency in a package ideally suited for coastal cruising and day sailing. The masthead sloop rig delivers 215 square feet of working sail area, providing spirited performance while remaining manageable for small crews. With a displacement of 1,950 pounds and 1,000 pounds of ballast, the boat offers reassuring stability for its size. The fin keel and spade rudder configuration ensures responsive handling and good upwind performance, while the 18-foot waterline length helps the boat achieve its theoretical hull speed of 5.69 knots. At just under 21 feet overall with a modest 7.83-foot beam, this Islander fits easily into most marina slips and can be trailered behind a suitable vehicle. The fiberglass construction ensures durability and low maintenance. While compact accommodations limit extended cruising potential, the Islander 21 excels as a weekend coastal cruiser, sailing trainer, or spirited day sailor for those seeking authentic sailing character in a manageable package.

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Dimensions & Specifications
LOA (Length Overall) 20.82 ft / 6.35 m
LWL (Waterline Length) 18.00 ft / 5.49 m
Beam 7.83 ft / 2.39 m
Max Draft 3.33 ft / 1.01 m
Displacement 1,950.00 lb / 885 kg
Ballast 1,000.00 lb / 454 kg
Ballast Type Iron
Sail Area (Reported) 215.00 ft² / 19.97 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer J. H. McGlasson
Builder McGlasson Marine/Wayfarer Yachts Corp. (USA)
First Built 1965
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Frequently Asked Questions

What is the Islander 21's sail area to displacement ratio?

The Islander 21 has a Sail Area to Displacement ratio (SA/D) of 22.09. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Islander 21's comfort ratio?

The Islander 21 has a Ted Brewer Comfort Ratio of 10.31. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Islander 21 safe for offshore sailing?

The Islander 21 has a Capsize Screening Formula value of 2.51. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Islander 21?

The theoretical hull speed of the Islander 21 is 5.69 kn knots, calculated from its waterline length.

How much does a Islander 21 weigh?

The Islander 21 has a displacement of 1,950.00 lb and a length overall (LOA) of 20.82 ft.

Who designed the Islander 21?

The Islander 21 was designed by J. H. Mcglasson, first built in 1965.