All certified airworthy aircraft engines have data plates attached that gives all the identifying info. If the plate is missing, the engine is not legally airworthy no matter what the actual...
Your question isn't clear. Are you asking WHY reciprocating engines for aircraft are called heat engines, or are you asking whether or not they are considered heat engines? Or are you asking...
aircraft engines are normally reciprocating engine or pistan engine, the Aircraft instruments in a reciprocating engine are
cylinder
piston
and so...................