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Sailboat Specifications

Thompson 850

Fractional Sloop · Lifting Keel

Designed by Thompson · First built 1999

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LOA 29.00 ft  ·  Beam 7.67 ft  ·  Displacement 3,800.00 lb  ·  Fractional Sloop  ·  Lifting Keel
About the Thompson 850 Sailboat

A product of Thompson Boat Company, the 850 is a modest sailboat that reflects the builder's broader reputation for producing accessible, entry-level watercraft aimed at recreational sailors. While detailed specifications for this model are limited, the 850 appears to be a compact daysailer or small cruiser well suited to protected waters, making it an appealing option for beginners or casual sailors looking for an uncomplicated time on the water. Thompson built a range of fiberglass boats throughout the mid-to-late twentieth century, and their sailboat offerings generally prioritized ease of handling and affordability over high-performance sailing characteristics. The 850 likely follows this philosophy, offering a manageable platform for inland lakes, bays, and calm coastal sailing rather than demanding offshore passages. For those researching the 850 as a potential purchase, it may appeal most as a low-maintenance weekend boat or a stepping stone for newer sailors building their skills. Prospective buyers are encouraged to seek out existing owners and inspect any available examples carefully, as documentation and parts support for older Thompson models can be harder to come by than for more widely produced designs.

Dimensions & Specifications
LOA (Length Overall) 29.00 ft / 8.84 m
LWL (Waterline Length) 27.58 ft / 8.41 m
Beam 7.67 ft / 2.34 m
Max Draft 7.67 ft / 2.34 m
Displacement 3,800.00 lb / 1,724 kg
Ballast 1,430.00 lb / 649 kg
Design & Construction
Hull Type Lifting Keel
Rigging Type Fractional Sloop
Construction FG
Designer Thompson
First Built 1999
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Frequently Asked Questions

What is the Thompson 850's comfort ratio?

The Thompson 850 has a Ted Brewer Comfort Ratio of 13.89. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Thompson 850 safe for offshore sailing?

The Thompson 850 has a Capsize Screening Formula value of 1.97. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Thompson 850?

The theoretical hull speed of the Thompson 850 is 7.04 knots, calculated from its waterline length.

How much does a Thompson 850 weigh?

The Thompson 850 has a displacement of 3,800.00 lb and a length overall (LOA) of 29.00 ft.

Who designed the Thompson 850?

The Thompson 850 was designed by Thompson, first built in 1999.