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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.
Radial engine of a biplane. Master rod (upright), slaves and balances from a two-row, fourteen-cylinder Pratt & Whitney Twin Wasp. The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders point outward from a central crankshaft like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is called a star engine (German Sternmotor) in some languages.