Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The BMW 803 was BMW's attempt to build a high-power aircraft engine by coupling two BMW 801s back-to-back driving contra-rotating propellers. The result was a 28-cylinder 4-row radial engine, like the contemporary American Pratt a Whitney R-4360 Wasp Major, but unlike the American engine, due to cooling concerns, the 803 engine was liquid cooled. One problem with scaling up any engine design is that eventually a point is reached where the crankshaft becomes a major engineering challenge. This was a problem that affected almost all engines of the 2, 500 hp (1, 900 kW) class, including BMW's own 18-cylinder BMW 802 project. For the 803 the engineers decided to avoid this problem by simply not using a common crankshaft, and driving a set of independent contra-rotating propellers. The front engine drove the front propeller directly, while the rear engine drove a number of smaller shafts that passed between the cylinders of the front engine before being geared back together to drive the rear prop. This layout resulted in a rather large gearbox on the front of the engine, and the front engine needing an extended shaft to clear the gearbox.Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.
|Author||:||Frederic P. Miller, Agnes F. Vandome, McBrewster John|