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3. Flying distance calculation
Problem: 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.
2. Speed (Ground Speed) Calculation
Problem: 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.