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Stock Outboard Racing uses both hydroplane and runabout or monoplane hulls with racing engines that use a service outboard powerhead and a racing lower unit with a direct drive (i.e. start in gear, no gear reduction). Racing in this form ranges from classes designated as follows: A Class, B Class, C Class and D Class.
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.
Small outboard motors, up to 15 horsepower (11 kW) or so, are easily portable. They are affixed to the boat via clamps and thus easily moved from boat to boat. These motors typically use a manual start system , with throttle and gearshift controls mounted on the body of the motor, and a tiller for steering.
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.
A screw turning through a solid will have zero "slip"; but as a propeller screw operates in a fluid (either air or water), there will be some losses. The most efficient propellers are large-diameter, slow-turning screws, such as on large ships; the least efficient are small-diameter and fast-turning (such as on an outboard motor).
A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is ...