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A magneto provides pulses of electrical power to the spark plugs in some gasoline-powered internal combustion engines where batteries are not available, most commonly those in 2-stroke and 4-stroke engines used in small motorcycles, lawnmowers and chainsaws, serving a similar function as the coil-type ignition system found in automobiles. In these cases the magneto advantage is in its compact nature and simple reliable function. They are used in most small aircraft, some racing automobiles and in older tractors. In aircraft, typically each cylinder has two spark plugs, each driven from a separate magneto. This arrangement provides redundancy in the event of a failure of one of the magnetos, and two sparks provide for a more complete and efficient burn of the fuel mixture.