
 FUEL CONSUMPTION
Solving problems of fuel consumption is similar to problems of speed, time, or distance.
Both are rate problems. The only difference is that the unit that changes over a given
amount of time is now fuel instead of distance. Again, it is a simple matter of setting up
ratios on the computer and solving for the unknown factor. The outer scale is now used as
the FUEL scale; and the solution is still a matter of transferring the ratio, or proportion, to
the outer/inner scales of the computer and reading the unknown factor (fuel consumed or
rate of consumption). Use the formula:
FUEL FL OW FUEL CO NSUMED
=
RATE INDEX
TIME
Since fuel is measured in pounds, the outer scale on the CR3 becomes the FUEL (in
pounds) scale while the inner scale remains the TIME scale.
Examples of fuel consumption problems follow.
EXAMPLE ONE:
Finding amount of fuel consumed.
Given: Fuel consumption. . . . . . . . . . . . . . 1000 pounds per hour
Time flown. . . . . . . . . . . . . . . . . . . .1 hour and 45 minutes
Find:
Fuel consumed
Solution:
1. Estimate the answer. Since the total time is just under 2 hours the answer should be
a little under 2000 (2 hr x 1000 # / hr), approximately 1800.
2. Place the RATE INDEX (▲) located on the TIME (inner) scale under the 10 (1000 #
/ hr) on the FUEL (outer) scale. (Figure 4.324)
Figure 4.324 Fuel Consumption 1
4.670

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