This small McCulloch 0-100-1 engine was used in drone aircraft like the Radioplane Model RP-15 (OQ-6) and the MQM 33 (Q-19).
[2] The McCulloch Aircraft Corporation acquired Helicopter Engineering Research Corp in 1951.
[3] Rights to the twin-rotor MC-4 was sold back to the original designer, Drago Jovanovich, in 1957.
Rights to the J-2 autogyro were sold to Aero Resources (Gardena, California) in 1974.
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