Battery booster coils for airplane-engine ignition systems

THE use of battery booster coils and problems in connection therewith requires an understanding of engine ignition-system design and operation. Figure 1 illustrates a complete ignition system consisting of ignition switch, two magnetos, radio-shielded harness, spark plugs and booster magneto. One magneto is illustrated completely assembled, and the other in skeleton form showing electric and magnetic circuits.