...Kiekhaefer Mercury 4-cylinder 55 h.p. AeroCycle, second generation - Features include folding landing gear, counter rotating, 15' diameter, two blade propellers - Top speed 75 m.p.h. and 150 mile range. Twelve prototypes were built & tested by the military and eventually discounted for use.https://c2.staticflickr.com/4/3100/3...4e9c8b2c_b.jpg

