07/21/2007. Harold Caminez invented a revolutionary four-stroke four-cylinder spark-ignition radial engine that produced 150 hp at 1,000 rpm. Caminez was supported by Sherman Fairchild and the Fairchild-Caminez 447 was first flown in this Avro 504 from Farmdale, Long Island, New York, in 1926. Due to excessive vibration the engine was abandoned in 1929. View also photo 11403.