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The Mono Aircraft Corporation and the Velie Motors Corporation of Moline, Illinois started in the aircraft engine field by building the Model M-5, certificated in 1928. The Velie M-5 was a close copy of the Detroit Aircraft Engine Corporation Aircat built in 1926. Because of dissatisfaction with the Aircat’s reliability and delivery problems, Mono Aircraft tasked the Velie automobile firm to build the M-5. Most of the patented features of the Aircat were declared infringed following litigation, and Velie had to pay damages.

Following deaths in the Velie family, the firm was first incorporated into the John Deere tractor business, and later production conducted by the Lambert Aircraft Engine Corporation, a subsidiary of the Allied Aviation Corporation. Because only Mono used this engine, Lambert was discontinued when the Monocoupe became obsolete.

The M-5 powered the Monocoupe, Monocoupe 113, and Monoprep 218.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date Circa 1928 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Velie Motors Corporation (Moline, Illinois)
 Physical Description Type: Reciprocating, 5 cylinders, radial, air cooled Power rating: 41 kW (55 hp) at 1,750 rpm Displacement: 4.1 L (250 cu in.) Bore and Stroke: 105 mm (4.125 in.) x 95.3 mm (3.75 in.) Weight: 108.9 kg (240 lb) Dimensions Depth 114.3 cm (45 in.), Length 110.5 cm (43.5 in.), Width 92.7 cm (36.5 in.) (approximate)
 Materials Aluminum, Steel, Wood, Phenolic, Plastic, Paint, Ceramic, Copper
 Inventory Number A19580018000 Credit Line Gift of Herman A. Ecker Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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