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Flat Plane Vs Cross Plane V8 engines. A flat plane V8 (animated on the left) is very much like two inline-4 engines mated together in a V configuration. Therefore end-to-end balance is inherent, as the first and last piston of a bank is always exactly in the same position, as are the center two pistons on each bank.
Auxillary Power Unit (APU) and Ground Power Unit (GPU) is used to mostly to assist the aircraft engines to start. They supply air to Air driven Motor. The motor is mechanically connected to the high pressure compressor assembly of the engine. This starts the engines.