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An ignition coil is used in the ignition system of a spark-ignition engine to transform the battery voltage to the much higher voltages required to operate the spark plug(s). The spark plugs then use this burst of high-voltage electricity to ignite the air-fuel mixture. The ignition coil is constructed of two sets of coils wound around an iron ...
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In a coil of multiple turns of wire the magnetic field of the turns adds in the center of the coil, creating a strong field. This drawing shows a cross section through the center of the coil. The crosses are wires in which current is moving into the page; the dots are wires in which current is emerging from the page.
As a result, orthocyclic wound coils with a round coil ground are never circular in the cross over section, but the radial moving winding and layer step creates a hump shape. Experience has shown that, depending on the winding width, coil and wire diameter, the crossover section is about 5 to 10 percent higher than the regular winding height.
A high voltage spark is used to ignite the gases. The voltage is stored up from a low voltage (usually 28 V DC) supply provided by the aircraft batteries. It builds up to the right value in the ignition exciters (similar to automotive ignition coils) and is then released as a high energy spark.
breaker points magneto ignition 4 coil, distributor, high voltage 4a, 4b distributor with two separate circuits, high voltage 7 terminal on ballast resistor, to distributor 15 battery+ from ignition switch 16 15a from ballast resistor to coil and starter motor 16 15e battery+ from ignition switch, also when starter motor runs
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