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3. Flying distance calculation
Question:
What is the flying distance traveled in 40 minutes at a speed of 210 knots?
Solution:
Align the 21 on the outside scale with the SPEED INDEX (
Y
) of the inside
scale. The 40 of the inside scale is now pointing to 14, and the answer is 140
nautical miles.
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2. Speed (Ground Speed) Calculation
Question:
What is the speed (ground speed) of an airplane when it takes 1 hour and 20
minutes to fly a distance of 240 nautical miles?
Solution:
Align the 24 on the outside scale with 1:20 (80) on the inside scale. At this
time, 18 is aligned with the SPEED INDEX (
Y
) on the inside scale, and the
answer is 180 Kt.
