Zündapp 9-092

The Zündapp 9-092 (also Zündapp Z 92 ) was a certain general aviation piston aircraft engine of the Nuremberg Zündapp works. In 1938, presented four-cylinder OHV engine was the direct successor to the smaller Zündapp 9-090. Designer of both engines was Ernst Schmidt. Until the production adjustment in 1940 about 200 pieces were produced. As the competition development, something stronger Hirth HM 515, he was intended for the so-called "people's planes," such as those of Franz Xaver More designed and built as a single piece in the Leipzig Erla machine shop Erla Me 5D. The equipped with this engine aircraft featured on several class records.

It was an air-cooled engine with overhead cylinders, that is, the built-in engine was the crankshaft above. The air screw is directly driven by the one-piece, consistently needle bearing crankshaft without propeller gearbox. The piston had three compression rings and one oil scraper ring. The back of the engine accessory drive cover was flanged. Mixture preparation is performed in a downdraft carburetor type Pallas SAF 30 GL. As a special disposal of the motor on two camshafts. These were the right and left of the crank shaft and operated in each case the push rods of the intake and exhaust valves. At their front ends were the pressure and suction pump of the dry sump lubrication system wherein the valve cover serving as an oil reservoir for the 4 liters of lubricant.

The hanging, the hemispherical combustion chamber obliquely built valves were actuated by rocker arms, so that the exhaust ports in the cylinder head could be kept very short. Since the air could be passed directly through the cylinder head, decreased as the thermal load. The engine was started by hand with a plug- crank.

The ignition system consisted of a Bosch Magneto, who provided a spark plug per cylinder ( single ignition ). The ignition timing was done automatically.

The engine was installed in the aircraft Klemm Kl 105, Gotha Go 150, Bücker Bu 180, Siebel Si 202B and Fieseler Fi 253, but also initially in the experimental helicopter Doblhoff WNF 342 V1. A few engines have been preserved. The more an engine is on display at the Deutsches Museum in Munich and the Museum of Technology Hugo Junkers in Dessau.

Specifications

  • Start Power: 37 kW (50 hp) at 2300 rpm
  • Continuous power: 33 kW (45 hp) at 1990/min
  • Specific consumption: 220 g / hp-hr
  • Capacity: 2 liters
  • Stroke: 88 mm
  • Bore: 85 mm
  • Compression ratio: 6.2:1
  • Length: 800 mm
  • Width: 350 mm
  • Height: 560 mm
  • 60 kg
  • Firing sequence 1 - 3 - 4 - 2

Swell

  • Kyrill von Gersdorff, Helmut Schubert, Stefan Ebert: aircraft engines and jet engines, Bernard & Graefe Verlag, Munich, ISBN 978-3-7637-6128-9
  • Helmut Schneider: Aircraft Type Book, 5th Edition 1944, Herm. Beyer Verlag Leipzig
  • Air Sports, issue 23/1938, pp. 612 ff
  • Zündapp
  • Line engine (aviation )
  • Helicopter engine
V4 engine Propeller (aeronautics) Needle roller bearing Rocker cover
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