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Mercedes D.IV

 

The Mercedes D.IV was an eight-cylinder, liquid-cooled inline aircraft engine built by Daimler Motoren Gesellschaft (DMG) and used on a small number of German aircraft during World War I.

 

The design was based around the pistons of the ubiquitous D.III 6-cylinder design and developed 162 kW (217 hp), making it a Class IV motor under the classification system then in use in Germany. When the reliability of the engine proved disappointing, it was supplanted in production by the unrelated six-cylinder Mercedes D.IVa. Specifically, the long crankshaft used in extending the original straight-six design to a straight-eight proved susceptible to breakage.

 

Applications:
AEG C.V
AEG G.III
AEG R.I
AGO C.II
AGO C.VIII
Albatros C.V
DFW R.I
Gotha G.II
LVG C.IV
various Riesenflugzeuge (R-planes)

 

Specifications
Type: 8-cylinder water-cooled inline aircraft piston engine
Bore: 140 mm (5.5 in)
Stroke: 160 mm (6.3 in)
Displacement: 19.7 L (1,200 in³)
Length: 1,990 mm (78 in)
Width: 600 mm (24 in)
Height: 1,040 mm (41 in)
Dry weight: 365 kg (800 lb)
Cooling system: Water-cooled
Power output: 162 kW (217 hp) at 1,400 rpm

 

 


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