Zündapp 9-092
The Zündapp 9-092 (also Zündapp Z 92 ) was a piston aircraft engine made by the Nürnberger Zündapp works and designed for general aviation . In 1938 presented four-cylinder - OHV engine was the direct successor to the smaller Zündapp 9-090 . Both engines were designed by Ernst Schmidt . Up to the end of production in 1940, around 200 pieces could be produced. Like the competitor development, the somewhat stronger Hirth HM 515 , it was also intended for the so-called “people's aircraft”, such as B. by Franz Xaver More constructed as a single piece and the Leipzig Erla Machine built Erla Me 5D . The aircraft equipped with this engine set several class records.
It was an air-cooled engine with hanging cylinders; H. the crankshaft was on top of the built-in engine . The propeller was driven directly by the one-piece, needle-bearing crankshaft without a propeller gear. The pistons had three compression rings and an oil control ring . The auxiliary device drive cover was flanged to the rear of the engine. The mixture was prepared in a falling-flow carburetor of the Pallas SAF 30 GL type. As a special feature, the engine had two camshafts . These sat to the right and left of the crankshaft and actuated the push rods of the intake and exhaust valves. The pressure and suction pumps for dry sump lubrication were located at their front ends, with the valve cover serving as an oil container for the 4 liters of lubricant.
The hanging valves installed at an angle in the hemispherical combustion chamber were operated by rocker arms, which meant that the exhaust ports in the cylinder head could be kept particularly short. Since the air could be passed directly over the cylinder head, the thermal load was reduced. The engine was started by hand with an insertable crank.
The ignition system consisted of a Bosch magneto that supplied one spark plug per cylinder (single ignition). The ignition timing was adjusted automatically.
The engine was installed in the Klemm Kl 105 , Gotha Go 150 , Bücker Bü 180 , Siebel Si 202B and Fieseler Fi 253 aircraft. A few engines remained. One engine each is exhibited in the Deutsches Museum in Munich and in the Hugo Junkers Technology Museum in Dessau.
Technical specifications
- Take-off power: 37 kW (50 PS) at 2300 rpm
- Continuous output: 33 kW (45 PS) at 1990 rpm
- Specific consumption: 220 g / PSh
- Displacement: 2 liters
- Stroke: 88 mm
- Bore: 85 mm
- Compression: 6.2: 1
- Length: 800 mm
- Width: 350 mm
- Height: 560 mm
- Weight: 60 kg
- Firing order: 1 - 3 - 4 - 2
Web links
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- Kyrill von Gersdorff, Helmut Schubert, Stefan Ebert: Aircraft engines and jet engines , Bernard & Graefe Verlag Munich, ISBN 978-3-7637-6128-9
- Helmut Schneider: Airplane type book , 5th edition 1944, Herm. Beyer Verlag Leipzig
- Air Sports , No. 23/1938, pp 612 et seq.
