Beginner's
Guide to Propulsion and EngineSim
Fuel and Air Relationships
Answers
1. Find the volume
of the air:
At
sea level, the density of air is 1.222 kilograms per cubic meter. There
are 454.5 grams per pound which gives 28.35 grams per ounce. So 1.222
kilograms is equal to 43.1 oz of air occupying 1 cubic meter. One cubic
meter is equal to 35.336 cubic feet. Therefore, one cubic foot of air
contains 1.2304 ounces and 1000 ounces of air will occupy 813 cubic
feet.
2. Find the volume
of jet fuel (17 ounces of jet fuel at 62.5% weight of water):
For
water, one cubic foot weighs 62.4 pounds and one pint equals one pound.
So one cubic foot contains 62.4 pints. There are 16 oz. in a pint, so
one cubic foot of water contains 998.4 oz. Jet fuel is 62.5% the weight
of water, so one cubic foot of jet fuel contains 624 oz. Therefore,
17 oz of jet fuel will take up .027 cubic feet.
3. What is
the ratio of the volume of fuel/volume of air?
The
ratio of the volumes is 813/.027 which equals 30,111.
