29
28
4) Rate of fuel consumption
Example : Obtain the rate of fuel consumption (gallons/hour) when the flight time is 30
minutes and the fuel consumption is 120 gallons.
Answer : Align "12" on the outer scale with "30" on the inner scale. Then, the SPEED
INDEX (▲) on the inner scale corresponds to "24" on the outer scale. Thus,
the fuel consumption is 240 gallons per hour.
5) Fuel consumption
Example : Obtain the fuel consumption required for a flight when the fuel consumption is
250 gallons per hour and the flight time is 6 hours.
Answer : Align "25" on the outer scale with the SPEED INDEX (▲) on the inner scale.
Then, "6:00" on the inner scale (time scale) corresponds to "15" on the outer
scale. Thus, the fuel consumption is 1,500 gallons.
6) Estimated flight time
Example : Obtain the estimated flight time when the fuel consumption is 220 gallons per
hour and the aircraft has 550 gallons of fuel.
Answer : Align "22" on the outer scale with the SPEED INDEX (▲) on the inner scale.
Then, "55" on the outer scale corresponds to "2:30" on the inner scale (time
scale) . Thus, the estimated flight time is 2 hours and 30 minutes.
A. Navigational calculation
1) Time required
Example : Obtain the time required for the flight of an aircraft at 180 knots for 450 nau-
tical miles.
Answer : Align "18" on the outer scale with the SPEED INDEX (▲) on the inner scale.
Then, "45" on the outer scale corresponds to "2:30" on the inner scale (time
scale) . Thus, the time required for the flight is 2 hours and 30 minutes.
2) Knots (air speed)
Example : Obtain the knots (air speed) for 240 nautical miles with a flight time of 1 hour
and 20 minutes.
Answer : Align "24" on the outer scale with "1:20" on the inner scale (time scale) .
Then, the SPEED INDEX (▲) on the inner scale corresponds to "18" on the
outer scale. Thus, the air speed for the flight is 180 knots.
3) Flight distance
Example : Obtain the air distance when the air speed is 210 knots and the flight time is
40 minutes.
Answer : Align "21" on the outer scale with the SPEED INDEX (▲) on the inner scale.
Then, "40" on the inner scale corresponds to "14" on the outer scale. Thus,
the air distance of the flight is 140 nautical miles.
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