BMW 803
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The BMW 803 was a German aircraft engine, an attempt by BMW to build a high-output aircraft engine by coupling two BMW 801 engines back-to-back, driving contra-rotating propellers. The result was a 28
BMW 803 on display at the Deutsches Museum
The large gearbox at the front is evident. The display on the left of the engine shows how the overhead cams were driven off the crank via a series of driveshafts
Junkers Jumo 222
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The Jumo 222 was a German high-power multiple-bank in-line piston aircraft engine from Junkers, designed under the management of Ferdinand Brandner of the Junkers Motorenwerke.
BMW 803
…German engine design, its power-to-weight ratio was only about 0.98 kW/kg (0.60 hp/lb), comparing rather poorly with other large designs like the Junkers Jumo 222 at 1.7 kW/kg, the primary powerplant design for the advanced Bomber B design competition, which was designed to use only two engines of over 1,500 kW…
Preserved Jumo 222E, with aftercoolers fitted
A DB 610 "power system" for comparison with the Jumo 222
A Junkers Ju 288 prototype powered by Jumo 222 engines, with ducted spinners and counter-rotating propellers.
Jumo 222 E built in 1944