Quote:
Originally posted by Norman Anthony
Now, what about Rocket Motors? Well, if you follow Mr. Merrick's statement, he's wrong. My brother, being a Machinist, used to machine Rocket Propelant in a Motor Casing for those "special" agencies in the U.S. The Rocket Motor was a chemical-based motor that produced motion via the material changing states (remember ... solid to gas/plasma).
Engine and Motor can be used interchangeably ... depends where you are, and how you are using it. Both words are now in our lexicon.
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In the space propulsion business, "engine" refers to liquid fuel based systems, while "motor" refers to solid propellant based systems.