Grumman sport boat
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A Grumman Sportboat, (also Sport Boat, SportCanoe, or Sportee) is a 15' 4" long, 43" wide square stern canoe manufactured in America. It, as well as the Coleman Scanoe, are patterned after "Grand Lakers," wooden fishing guide boats built on Grand Lake, Maine for oar power, subsequently modified for the advent of small outboard engines with the addition of more bearing aft and a flat tumblehome transom.
The Sport Boat is designed to be rowed, sailed, or powered by an outboard motor, and is among few designs to be fairly efficient at all three. It can also be poled or paddled, but is too wide for efficient paddling. It is manufactured in a fashion similar to an aircraft, made of a stressed skin aluminum, riveted together, and weighs slightly over 110 pounds. In current production, it is rated for 750 pounds capacity and a 5 horsepower (3.7 kW) outboard motor. It can plane with as little as a 3.5 hp motor, and has been used with as much as a 25 hp motor. Moving a lone operator forward to the middle seat enables planing performance over 10 mph with as little as 2.5 hp. Ballasting the bow greatly improves operation under power.
As a canoe, the Grumman Sport Boat was originally rated for an 1,100 pound payload. Due to its unusual planing ability, the United States Coast Guard in the 1970s applied a different rating rule. Without any changes to the boat, the payload rating dropped to 550 pounds. Evolving rules for planing boats, requiring level flotation when swamped with maximum payload and rated engine, led to the demise of production by Grumman in 1979. The inaugural issue of Small Boat Journal decried the end of Grumman's Sport Boat production in a black-bordered article evocative of a eulogy. The Grumman Sport Boat was named by the editors of Small Boat Journal as one of the 10 best small boats of all time.
Boatbuilder and designer Robb White wrote of one in his essay "The Chicken Feed Boat," and made a strip-planked wood variant and sold the plans. Small Boat Journal founding editor David Getchell wrote a feature SBJ article about the SportBoat and bought one, and mentioned it again in "Outboard Boater's Handbook: Advanced Seamanship and Practical Skills."
Early models included the mast base clip and gunwale holes to use with the Grumman factory sail kit, with either a gunter or lateen rig. Sail kits are long out of production.
SportBoats remain popular in the Great Lakes and midwest, and are a favorite of duck hunters, frequently camouflaged with the oarlock sockets removed to eliminate hang-ups in grass. Except on Alaskan rivers, Sport Boats are uncommon west of the Rockies. The University of Washington Aquatic Recreation Center has a dozen or so heavily used and extensively repaired SportBoats in its rowing fleet on Lake Washington at the Montlake Cut.
The Marathon Boat Group, a company of former Grumman managers and investors, reintroduced production of the Sport Boat with sheathed flotation under the gunwales to comply with the level-flotation rule. Originally, the Sport Boat featured twin sets of oarlock sockets, but the current version has only one, and the sheathed flotation makes retrofitting the second set difficult. Marathon continues to make the Sport Boat and other Grumman canoes, and in 2000 acquired rights to use the Grumman name and logo. (see also "Discussion" in this category). L. Manser, England.
Revision G. Walsh, U.S. 2012
- "Outboard Boater's Handbook: Advanced Seamanship and Practical Skills" David Getchell, editor. 1994, International Marine, McGraw-Hill