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Sailboat Specifications

Mobjack

Fractional Sloop · Centerboard Dinghy

Designed by Roger Moorman · Built by Mobjack Manufacturing (Usa) · First built 1956

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LOA 17.00 ft  ·  Beam 6.50 ft  ·  Displacement 450.00 lb  ·  Sail Area 180.00 ft²  ·  Fractional Sloop  ·  Centerboard Dinghy
About the Mobjack Sailboat

Designed by Roger Moorman in 1956, this 17-foot centerboard dinghy represents a classic era of American small boat design. Built by Mobjack Manufacturing through 2003, with 537 hulls produced over nearly five decades, the Mobjack earned a solid reputation among sailors seeking a capable day sailer and training platform. The boat's fractional sloop rig and generous sail area of 180 square feet provide spirited performance for its size, while the centerboard configuration allows for versatile sailing in both shallow and deep waters. At 450 pounds displacement, she's light enough for trailer sailing yet substantial enough to handle choppy conditions with confidence. The relatively deep four-foot draft when the board is down contributes to excellent upwind performance. With a hull speed of 5.48 knots and favorable sail area-to-displacement ratio, the Mobjack delivers satisfying performance for coastal day sailing, sailing instruction, and club racing. Her moderate beam and traditional proportions create a well-balanced boat that's forgiving for novice sailors while still engaging for experienced hands. The fiberglass construction ensures durability and relatively low maintenance, making her an attractive option for sailors seeking a classic design with modern materials.

Dimensions & Specifications
LOA (Length Overall) 17.00 ft / 5.18 m
LWL (Waterline Length) 16.75 ft / 5.11 m
Beam 6.50 ft / 1.98 m
Max Draft 4.00 ft / 1.22 m
Min Draft 0.75 ft / 0.23 m
Displacement 450.00 lb / 204 kg
Sail Area (Reported) 180.00 ft² / 16.72 m²
Design & Construction
Hull Type Centerboard Dinghy
Rigging Type Fractional Sloop
Construction FG
Designer Roger Moorman
Builder Mobjack Manufacturing (USA)
First Built 1956
Last Built 2003
Number Built 537
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Frequently Asked Questions

What is the Mobjack's sail area to displacement ratio?

The Mobjack has a Sail Area to Displacement ratio (SA/D) of 49.11. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Mobjack's comfort ratio?

The Mobjack has a Ted Brewer Comfort Ratio of 3.41. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Mobjack safe for offshore sailing?

The Mobjack has a Capsize Screening Formula value of 3.4. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Mobjack?

The theoretical hull speed of the Mobjack is 5.48 kn knots, calculated from its waterline length.

How much does a Mobjack weigh?

The Mobjack has a displacement of 450.00 lb and a length overall (LOA) of 17.00 ft.

Who designed the Mobjack?

The Mobjack was designed by Roger Moorman, first built in 1956.