With the success of the Greenough 17 it didn’t take long until customer demand envisioned taking the Greenough design and enlarging it into a 21’ length with a larger beam. These boats offer a larger platform, still lightweight and economical, but with increased range and comfort, being capable of more payload and longer trips. Available with a variety of power options ranging from single or twin outboards, inboard gas or diesel, or straight shaft diesel. Like all Anderson Custom Boats, we have built many of these hulls for commercial work but many have also been done for recreational purposes, offering a perfect sized family boat with the ability to customize the build to fit whatever options you find valuable..

The Greenough hull is a unique tri-hull that is designed for efficiency and maximum planing capabilities. The hull design is a modified vee, with forward chines and a “w” stern that make it very suitable for West Coast sea conditions. This unique design enables the boat to stay on a plane and maintain a high speed in both forward sea and following sea conditions. 


Construction is a hand-laid, vacuum bagged foam cored fiberglass hull, hand-constructed wood over fiberglass decks, and non-skid deck surfacing. Offered in a molded foam cored fiberglass pilot house and center console.


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LENGTH: 21’ BEAM: 8’ 2” HULL DRAFT: 1’ DRY WEIGHT: 4000 FUEL CAPACITY: 100-120 Gallons SLEEPS: 2-3

POWER PACKAGES: Single or Twin outboards,

Gas and Diesel Sterndrive, Diesel Inboard