National Geographic NG770A, Инструкция по эксплуатации

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(6) Estimated Flight Time
Example: Obtain the estimated flight time when the fuel
consumption is 260 gallons an hour and the aircraft has 650
gallons of fuel.
Operation: Align "26" on the outer scale with the SPEED INDEX
on the inner scale. Then, "65" on the outer scale corresponds to
"150" on the inner scale (time scale). Thus, the estimated flight
time is 2 hours and 30 minutes.
(7) Difference in Altitude
The difference in altitude can be obtained from the rate of
descent and the descent time.
Example: Obtain the difference in altitude when an aircraft
continues descending for 20 minutes at a rate of 430 feet a
minute.
Operation: Align "43" on the outer scale with "10" on the inner
scale. Then, "20" on the inner scale corresponds to "86" on the
outer scale. Thus, the difference in altitude is 8,600 feet.
(5) Fuel Consumption
Example: Obtain the fuel consumption required for a flight when
the fuel consumption is 236 gallons an hour and the flight time is 9
hours.
Operation: Align "23.6" on the outer scale with the SPEED INDEX
on the inner scale. Then, "9:00" on the inner scale (time scale)
corresponds to "35" on the outer scale. Thus, the fuel consumption
is 3,500 gallons.
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