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8180
Model 2
A. Navigation Calculator
1. Calculation of time required
Problem: How long does it take an airplane flying at 180 knots to fly a distance of 450
nautical miles?
Solution: Set the 18 mark on the outside scale to the SPEED INDEX (Y). At this
time, the point on the inside scale that is aligned with 45 on the outside scale
indicates (2:30), and the answer is 2 hours and 30 minutes.
<Measuring remaining time>
You can tell how much time remains by aligning the
q
mark (or K mark) on the slide
rule bezel with the target time.
Remaining time: This indicates that 20 minutes remain until 9:25.