Frank Hrubetz & Company

The company was founded by Frank Hrubetz, a 1930 graduate of Oregon State College with a degree in mechanical engineering. Hrubetz worked for the Eyerly Aircraft Company which developed a 10-foot airplane on a fixed base for training pilots. Called the Orientator, it used a small electric propeller and could climb, dive and turn. The company discovered it was more profitable as entertainment after one buyer placed the trainer on the corner of Hollywood and Vine in Los Angeles as an amusement ride. While working for Lee Eyerly, Hrubetz helped develop other rides including the Loop-O-Plane and later Roll-O-Plane—two small bullet-shaped cars that spun rapidly on a vertical axis. In 1939, Hrubetz left Eyerly to become a competitive manufacturer with Frank Hrubetz & Co.