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The SMA SR305-230 is an air/oil-cooled, horizontally opposed, four-cylinder, four-stroke, diesel piston aircraft engine producing 170 kW (227 hp). The engine is manufactured by SMA Engines, and is currently the only product of this French company. The engine is offered as a conversion package for the Cessna 182.
Model diesel engines are instead a carbureted two-stroke using the crankcase for charge-air compression. The carburetor supplies a mixture of fuel and air into the engine, with the proportions kept fairly constant and their total volume throttled to control the engine power. Apart from sharing the diesel's use of compression ignition, their ...
Since the ignition timing is not controlled electrically, as in a spark ignition engine or by fuel injection, as in an ordinary diesel, it must be adjusted by the richness of the mixture, the ratio of nitromethane to methanol, the compression ratio, the cooling of the cylinder head, the type of glow plug, etc. A richer mixture will tend to cool ...
Interest in diesel engines in the postwar period was sporadic. The lower power-to-weight ratio of diesels, particularly compared to turboprop engines, weighed against the diesel engine. With fuel available cheaply and most research interest in turboprops and jets for high-speed airliners, diesel-powered aircraft virtually disappeared.
Data from Aircraft Diesels: Chapter 3 - The Guiberson Diesel General characteristics Type: 9-cylinder air-cooled radial diesel piston engine Bore: 5.125 in (130.18 mm) Stroke: 5.5 in (139.70 mm) Displacement: 1,021 cu in (16.73 L) Length: 38.6 in (980 mm) including starter Diameter: 47.125 in (1,197.0 mm) Dry weight: 653 lb (296 kg) Designer: F. A. Thaheld Components Valvetrain: two pushrod ...
The design is a four-cylinder, two-stroke, piston diesel engine, in an inverted-V configuration, with turbocharging and supercharging, mechanical fuel injection, liquid cooling, direct drive. It can run on Jet-A or sustainable aviation fuel. The manufacturer claims that it has "40 percent fewer moving parts than other engines in its category ...