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Developed from the Type 1466, which was used in large numbers from the beginning of World War I, this engine was manufactured by Daimler Motoren Gesellschaft in Stuttgart-Unterturkheim, Germany. On August 1, 1918, it was shipped to the Pfalzflugzeugwerke in Speyer, Germany for installation in a Pfalz fighter aircraft.

This is a rare high-altitude version of the Mercedes Daimler IIIa. To obtain more power for high-altitude operation, it was over dimensioned and supercharged. The DIII av was certificated in June 1918, and flew for the first time on September 20, 1918 in a Fokker D VII. After August 1918, aluminum pistons were used in the engine, and the compression ratio was raised to 1:6.6.

 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 1918 Country of Origin Germany Type PROPULSION-Reciprocating & Rotary Manufacturer Daimler-Benz Aktiengesellschaft
 Designer Mercedes
 Physical Description Type: Reciprocating, In-line, 6 cylinders, Water-cooled Power rating: 128 kW (170 hp) at 1,450 rpm Displacement: 14.8 L (901.32 cu. in.) Bore and Stroke: 140 mm (5.51 in) x 160 mm (6.3 in) Weight: 288 kg (635 lb) Dimensions Depth 134.6 cm (53 in.), Length 177.8 cm (70 in.), Width 71.1 cm (28 in.)
 Materials Steel, Aluminum, Paint, Brass, Rubber, Preservative coating, Phenolic, Textile, Wood
 Inventory Number A19840907000 Credit Line Transferred from the U.S. Air Force Museum, Wright-Patterson AFB, Ohio Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
For more information, visit the Smithsonians Terms of Use.