The Mono Aircraft Monoprep was an American light civil sporting monoplane of the late 1920s.

Mono Aircraft was founded in 1927 and their first design was the Monoprep high-wing sporting two-seat open cockpit monoplane. Eight Monopreps were built.

The improved Monoprep 218 followed the initial model in 1929, with a 3 ft (1 metre) shorter wingspan giving increased speed. 84 Monoprep 218s were built by 1930. One long-nosed aircraft was used to test one of the two Lambert H-106 engines during 1930.^[1]

The sole surviving example of the Monoprep 218 NC179K was publicly displayed in airworthy condition in the Airpower Museum at Ottumwa Iowa.^[2] It has now changed into private hands and is under restoration to fly again.

Data from www.aerofiles.com

General characteristics

• Crew: 1
• Capacity: 1 passenger
• Length: 21 ft 0 in (6.40 m)
• Wingspan: 32 ft 0 in (9.75 m)
• Useful lift: 505 lb (229 kg)
• Powerplant: 1 × Velie M-5 , 55 hp (41 kW)

Performance

• Maximum speed: 90 mph (145 km/h, 78 kn)
• Cruise speed: 80 mph (130 km/h, 70 kn)
• Stall speed: 45 mph (72 km/h, 39 kn)
• Range: 250 mi (400 km, 220 nmi)