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Motore aeronautico Mercedes D.IVa
1916 - 1918



16

Description

The Mercedes D.IVa was an aircraft engine with six-cylinder in line produced by the German company Daimler-Motoren-Gesellschaft in 1916 to replace, in the range 200-299 hp ("klasse IV"), the previous disastrous Mercedes D.IV with 8 cylinders. The D.IVa took up most of the constructive solutions of the Mercedes engines, with a new 4-valves per cylinder arrangement and a particular attention to the reduction of the frontal area. To this purpose, the carburetor, normally mounted on one side, was placed behind the engine and connected to the cylinders through a long intake manifold. This, in turn, entailed the disadvantage of not distributing evenly between the cylinders the air-fuel mixture. The D.IVa was produced in various versions, for a total of 4550 samples, and developed until the end of the war. The aspirated versions were produced in two series, with different direction of rotation, for the use on twin-engine aircraft; later, in the search for ever greater power at high altitude, some supercharged versions with centrifugal multistage compressors were developend in cooperation with various manufacturers: Schwade & Co, Brown Boveri, AEG and Siemens-Schuckert. Finally, an experimental version with direct fuel injection was developed in 1918 in collaboration with Junkers.


Technical specifications

ManufacturerDaimler Motoren Gesellschaft, Stuttgart-Untertürkheim, Germany, 1916
TypeMercedes D.IVa
Descriptionaircraft engine with 6-inline cylinders, aluminium alloy crankcase with 7 main bearings, stell-made cylinder and heads, cooling jackets in thin-walled welded steel, steel-made pistons from of two part (top and skirt) screwed and welded
Stroke180 mm
Bore160 mm
Displacement21700 cm³
Compression ratio4.82
Power260 hp at 1450 rpm (max. output at sea level)
Specific fuel consumption230 g/hp/h
Specific power12.7 hp/litre
Valvetrain system2 overhead valves per cylinder controlled by an overhead gear-driven camshaft
Fuel feeding systemwith a single-barrel gasoline carburetor
Ignition systemtwo spark plugs per cylinder fed by two high voltage magneto distributors Bosch Zh6, firing order: 1-5-3-6-2-4
Cooling systemliquid-fed by a centrifugal pump
Lubrication systemforced by means of a 4-cylinder reciprocating pump
Weight410 kg
Mass-to-power ratio1.50 kg/hp


Application

AEG G.IV (bombardier)

AEG R.I (bombardier)

Albatros C.X (reconnaissance aircraft)

Albatros C.XII (reconnaissance aircraft)

Albatros C.XV (reconnaissance aircraft)

Friedrichshafen G.III (bombardier)

Gotha G.III (bombardier)

Gotha G.V (bombardier)

Rumpler C.IV (reconnaissance aircraft)

Zeppelin-Staaken R.VI (bombardier)

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Testi e immagini di Giuseppe Genchi
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