When you have a ratio like 1/72, that simply
means that one unit of measurement (inches, feet, yards, millimeters,
meters, etc.) on the model is equal to 72 of the same unit of
measurement on the real thing. In your example (torpedo), the
unit of measurement of the real thing is inches (21" diameter ), so to
figure the diameter of the torpedo on the model, divide 21" by 72,
which is approximately .291". Expressed as a fraction, this is
just under 19/64".
A 1/72 scale torpedo that was 5/8" (approximately .625") in diameter
would equate to a 45" diameter real one. Man, can you imagine the
size of the hole that would make in the side of a ship... :-}.
Al Ross
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