17
16
H. USING THE SLIDE RULE
Flying distance and other navigation
calculations as well as general
calculations can be performed using
the slide rule located around the
outside of the dial. This slide rule is
not able to display decimal places for
calculation results, and should only
be used as a general reference as an
alternative to more accurate
calculations. Turning the crown at
the 8:00 position allows the slide rule
around the dial (Outside Scale) to be
rotated.
A. Navigation Calculator
1. Calculation of time required
Question:
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.
Inside scale
Outside
scale
Crown for turning the outer scale
