Current testing requirements for high temperature alloys are defined in general industry specifications (ASTM, AMS), as well as in user specifications. Many of these requirements were established in the 1960's when production practices were yet to be refined.
cowling - protective covering consisting of a metal part that covers the engine; there are powerful engines under the hoods of new cars; the mechanic removed the cowling in order to repair the plane's engine.
An internal combustion engine is any engine that uses the explosive. combustion of fuel to push a piston within a cylinder - the piston's. movement turns a crankshaft that then turns the car wheels via a chain or. a drive shaft.