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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.
Answer Wiki. When it comes to propeller planes, there are two different distinctions. Propeller planes can either be piston engined or turboprop powered, and the largest aircraft for each category is different. For piston engined aircraft, the largest is also the most famous - the Hughes H-4K Hercules a.k.a the Spruce Goose.