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5 Rotary combustion engines versus rotary engines
The Wankel is a specific type of rotary combustion engine , of which many other designs have been devised [1], all having the same basic concept; to avoid the reciprocating motion of the piston with its inherent vibration and rotational-speed-related mechanical stress. Sometimes these engines or the Wankel engine specifically are referred to in somewhat erroneous shorthand as rotary engines, although the term rotary engine was first used to describe a type of aircooled reciprocating aircraft engine with a static crankshaft attached to the airplane, and a bank of cylinders which rotate around the crankshaft and are attached to the propeller, the opposite design to the normal automotive piston engine. They might more properly be called "rotating" engines, but the terminology for the time being is entrenched.
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