Mercedes D.II

Mercedes D.II
D.II
Daimler D II engine
Type Inline piston engine
Manufacturer Mercedes

The Mercedes D.II was a six-cylinder, liquid cooled inline aircraft engine built by Daimler during the early stages of World War I. Producing about 110 to 120 hp, it was at the low-end of the power range of contemporary engines, and was generally outperformed by rotaries whose power-to-weight ratio tended to be much better. It also had stiff competition from the Ferdinand Porsche-designed 120 hp Austro-Daimler 6. The D.II was produced only briefly as a result, but its design formed the basis for the later Mercedes D.III which saw widespread use throughout the war.

Contents

Design and development

The D.II was based on the Austro-Daimler to a large degree. Like the Austro-Daimler, it was built up from the crankcase, which was milled from two pieces of cast aluminum bolted together at their midline. The cylinders were separately milled from steel and bolted to the top of the crankcase. Steel sleeves were fitted over the cylinders and welded on to form a cooling jacket. Much of this complexity is due to the differential rates of expansion of steel and aluminum, which precluded screwing the cylinders into the crankcase, and the alloys of the era meant that an aluminum cylinder was not possible. Both engines also used a scavenger pump to pump oil out of the crankcase to a separate cylinder, where a second high-pressure pump supplied oil to the engine. This arrangement allowed for a much smaller "sump" on the bottom of the crankcase, reducing the overall size of the engine, although in the case of the D.II it was not nearly as much as the Austro-Daimler.

Where the D.II differed from the Austro-Daimler was largely in mechanical arrangement. For instance, the D.II featured a single overhead cam, powered by a shaft leading up from the crankshaft at the rear of the engine, whereas the Austro-Daimler had a more conventional valvetrain using pushrods driven from the crankcase. Another unique feature was the ability to shift the camshaft to a half-compression position for starting. The D.II used two carburetors located together on one side of the engine, feeding the cylinders through two manifolds; the Austro-Daimler separated its carburetors to locate them closer to the cylinders they fed. The D.II also used a unique cooling jacket design, with every two cylinders being covered by a single jacket.

The D.II was fairly quickly replaced by the D.III, and ended production around 1916. The D.III was essentially a scaled-up D.II, although it abandoned the paired cooling jackets.

Applications

Engines on display

One known surviving example of this engine is at Old Rhinebeck Aerodrome-its crankshaft may not be whole, however.

Specifications (D.II)

General characteristics

  • Type: 6-cylinder, inline piston engine
  • Displacement: 579 cu in
  • Dry weight: 449 lb

Components

Performance

  • Power output: 120 hp at 1,400 rpm

See also

Comparable engines
Related lists

References

Notes

Bibliography

  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
  • Jane's Fighting Aircraft of World War I. London. Studio Editions Ltd, 1993. ISBN 1-85170-347-0

Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Mercedes /8 — Mercedes Benz Mercedes Benz W114/W115 W114/W115 Hersteller: Daimler Benz Produktionszeitraum: 1967–1976 …   Deutsch Wikipedia

  • Mercedes GL — Mercedes Benz GL Klasse Hersteller: Daimler AG Produktionszeitraum: seit 2006 Klasse …   Deutsch Wikipedia

  • Mercedes G — Mercedes Benz Mercedes Benz G Klasse (W 460/461) G Klasse Hersteller: Mercedes Benz Produktionszeitraum: seit 1979 …   Deutsch Wikipedia

  • Mercedes 35 HP — Constructeur …   Wikipédia en Français

  • Mercedes 35 hp — Constructeur Daimler pour Mercedes Classe …   Wikipédia en Français

  • Mercedes — is a girl s name of Spanish origin, referring to a title for the Virgin Mary, Our Lady of Mercy . The word may also refer to: Automobile related Mercedes (car), the pre 1927 brand name of German automobile models and engines built by Daimler… …   Wikipedia

  • Mercedes 35 hp — Manufacturer Daimler Motoren Gesellschaft Production 1901 Predecessor Daimler Phoenix …   Wikipedia

  • Mercédès — Mercedes ist ein weiblicher Vorname. Inhaltsverzeichnis 1 Herkunft und Bedeutung des Namens 2 Namenstag 3 Bekannte Namensträgerinnen 3.1 Sonstiges 4 Varianten …   Deutsch Wikipedia

  • Mercedes 35 PS — (1901) im Foyer des Mercedes Benz Museums Emil Jellinek bestellte am 2. April 1900 bei der Daimler Motoren Gesellschaft gleich in dutzenden Exemplaren einen neuen Wagentyp als Nachfolger des Phönix Rennwagen. Wilhelm Maybach entwickelte den… …   Deutsch Wikipedia

  • Mercedes — n. p. f. Nombre de mujer. Completo, María de las Mercedes. ⇒ Merche. * * * Varias ciudades llevan el nombre Mercedes: ● Mercedes, en la provincia argentina de Buenos Aires; ● Mercedes, en la provincia argentina de Corrientes, capital del… …   Enciclopedia Universal

  • Mercedes — (Хавеа,Испания) Категория отеля: Адрес: Beethoven BAM , 03738 Хавеа, Испания …   Каталог отелей

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”