 The Zephyr was designed by John Tjaarda (1897–1962), who was fascinated with airplanes, resulting in unibody construction relatively light and rigid for its size and a drag coefficient of 0.45.Weight was 3,350 lb (1,520 kg).The Zephyr was powered by a small 75° V12 engine developed from Ford's Flathead V8 and unrelated to the larger K-series Lincoln V12 engines.