Engine or Motor?

Today I am switching directions to talk
about two words which are mistakenly
used interchangeably.
Those words are engine and motor.
I will start out by telling you a short
true story.
In May of 1952 about three dozen of us
newly out of basic training airman reported
for duty at Sheppard Air Force Base next
to Rome, New York.
Most of us were assigned to a radar calibration
squadron as B-29 mechanics. But before we
could call ourselves mechanics, it was necessary
for us to undergo considerable training.
This training started out by our sitting through
a couple of weeks of classroom instruction conducted a master sergeant.

The very first day he started his lecture by asking
us how many motors a B-29 airplane had. We had
just walked be a b-29 on our way into the classroom
so everyone thought they knew the answer. After
all, we could count.
We all raised our hands and one airman was picked
to provide the answer. He said "Four!".
"Wrong!" announced the MS.. A b-29 has 105 motors.
He then asked "How many engines does a B-29 have?"
There weren't as many hands raised this time as we
were wary of what was apparently a trick question.
A few did raise their hand and he selected one for the
answer. "Four" that person said, hesitantly. "Again,
wrong" the MS said. "A b-29 has five engines. It has
four engines to turn the big propellers. It has has an
engine in the rear of the plane to turn the auxillary
generator."
He then asked " can anyone tell me the difference
between an engine and a motor"?
This time no one wanted to sound like a fool and
venture an answer. So he answered his own question.

"An engine creates it's own energy" he said.
Gasoline, deisel, turbine and steam engines are
primary examples of this. You see one of these on
almost all trucks, cars, airplanes, ships, tractors and motorcycles.
In contrast, a motor gets it's energy from some
outside source. Examples of a motor are
electrical motors, windmills, water powered
motors and some turbines which get their
energy from somewhere else." With that he
conclude that day's lecture.
This little lecture has stuck with me for the past
56 plus years. I am still bothered when someone,
especially trained mechanics, who says motor
when they are talking about an engine. It makes
me wonder about their mechanical training.
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