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6. Using the Register Ring
The bezel design may vary depending on the
model.
[Calculation function]
Note the following points when using this func-
tion. Use the calculation function of this watch
only as a guide.These scales do not indicate
the position of the decimal point.
A. Navigational calculation
1) Time required
Example: Obtain the time required fo the fight of an aircraft at 180 knots for
450 nautical miles.
Answer. Align "18" on the outer scale with the SPEED INDEX (L) on the
inner scale. Then, "45" on the outer scale corresponds to "2:30" on
the inner scale (time scale). Thus, the time required for the flight is 2
hours and 30 minutes.
2) Knots (air speed)
Example: Obtain the knots (air speed) for 240 nautical miles with a flight time
of 1 hour and 20 minutes.
10
Speed index
Outer scale
60
(distance scale)
Inner scale
(Time acale)
Answer. Align "24" on the outer scale with "1:20" on the inner scale (time
scale). Then, the SPEED INDEX (L) on the inner scale corresponds
to "18" on the outer scale. Thus, the air speed for the flight is 180
knots.
3) Flight diatance
Example: Obtain the air distance when the air speed is 210 knots and the flight
time is 40 minutes.
Answer. Align "21" on the outer scale with the SPEED INDEX (L) on the
inner scale. then, "40" on the inner scale corresponds to "14" on the
outer scale. Thus, the air distance of the flight is 140 nautical miles.
4) Rate of fuel consumption
Example: Obtain the rate of fuel consumption (gallons / hour) when the flight
time is 30 minutes and the fuel consumption is 120 gallons.
Answer. Align "12" on the outer scale with "30" on the inner scale. Then, the
SPEED INDEX (L) on the inner scale corresponds to "24" on the
outer scale. Thus, the fuel consumption is 240 gallons per hour.
5) Fuel consumption
Example: Obtain the fuel consumption required for a flight when the vate of
fuel consumption is 250 gallons per hour and the flight time is 6
hours.
11
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