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For redundancy, virtually all piston engine aircraft are fitted with two magneto systems, each supplying power to one of two spark plugs in each cylinder. Magnetos were used for specialized isolated power systems such as arc lamp systems or lighthouses, for which their simplicity was an advantage.
A Jabiru 5100 flat-8 four-stroke aircraft engine with dual ignition, with two spark plugs per cylinder and two distributors.. Dual Ignition is a system for spark-ignition engines, whereby critical ignition components, such as spark plugs and magnetos, are duplicated.
In piston aircraft engines, the battery does not generate the spark for combustion. This is accomplished using devices called magnetos. Magnetos are connected to the engine by gearing. When the crankshaft turns, it turns the magnetos which mechanically generate voltage for spark. In the event of an electrical failure, the engine will continue ...
Magneto components. Impulse coupling components. An ignition magneto (also called a high-tension magneto) is an older type of ignition system used in spark-ignition engines (such as petrol engines). It uses a magneto and a transformer to make pulses of high voltage for the spark plugs. The older term "high-tension" means "high-voltage". [1]
The engine has a dry weight of 269.75–297 lb (122–135 kg) including the generator and starter. The ignition system consists of dual magnetos , one Scintilla S4RN-201 and one S4RN-205 or, alternatively, two Slick Electro 449 magnetos.
The engines are all carburetor-equipped, feature dual magneto ignition and have a displacement of 233 cubic inches (3.82 L). The first O-235 model was certified on 11 February 1942. [2] The O-235 was developed into the lighter-weight Lycoming IO-233 engine for light sport aircraft. [3]
They tried again by "twinning" the engine to produce the H block H-2470, which saw some interest in the Vultee XP-54 "Swoose Goose" project. Work on the H-2470 ended when the XP-54 was cancelled. In one final attempt, Lycoming decided to go all out and build what would turn out to be the largest displacement aircraft piston engine in the world.
The engine series are all four-cylinder four-stroke, horizontally-opposed, air-cooled, Volkswagen automotive conversion gasoline engines, with direct-drive. They employ magneto ignition systems and, depending on the model, produce 55 to 80 hp (41 to 60 kW) at 3600 rpm, with a compression ratio of 8.0:1. They use a geared electric starter.