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1927 Johnson Seahorse outboard motor at the Tellus Science Museum. The original company that made Johnson inboard motors and outboard motors was the Johnson Brothers Motor Company of Terre Haute, Indiana, United States. They started building inboard 2-cycle marine engines in 1903 in a barn behind the house, along with matching boats.
In marine propulsion, a variable-pitch propeller is a type of propeller with blades that can be rotated around their long axis to change the blade pitch. Reversible propellers—those where the pitch can be set to negative values—can also create reverse thrust for braking or going backwards without the need to change the direction of shaft revolution.
The Waterman outboard engine appears to be the first gasoline-powered outboard offered for sale in significant numbers. [11] It was developed from 1903 in Grosse Ile, Michigan, with a patent application filed in 1905 [12] Starting in 1906, [13] [14] the company went on to make thousands of his "Porto-Motor" [15] units, [16] claiming 25,000 ...
A chopper is a propeller design largely of interest for production outboards on fast pad v-bottom boats. Unlike a cleaver the chopper's trailing edge extends aft with a large chord line at each radius.
An advanced type of propeller used on the American Los Angeles-class submarine as well as the German Type 212 submarine is called a skewback propeller. As in the scimitar blades used on some aircraft, the blade tips of a skewback propeller are swept back against the direction of rotation. In addition, the blades are tilted rearward along the ...
British Seagull was a British manufacturer of simple and rugged two-stroke marine outboard motors, produced from the late 1930s until the mid-1990s. Originally based in Wolverhampton, the company moved to Poole, Dorset, a centre for boating and yachting. Seagull engines were utilitarian outboards with a relatively slow-turning prop.