Citizen Nighthawk Series Manuale utente



Crown ‘A’

(used for setting

time/date functions)

24-Hour Hand (PM Side)

24-Hour Time ‘AM’ Scale

Pilots Slide Rule

Dial Ring (Outer Scale)

Hour Hand

Crown ‘B’

(used for rotating

Pilots Slide Rule

Dial Ring

Minute Hand

24 Hour Hand (AM Side)

Slide Rule

Inner Scale

Date

Second Hand

24-Hour Time ‘PM’ Scale

Nighthawk Series (mvt. cal. B877) Quick Reference









































24 Hour Hand and 24 Hour sub dial









Crown ‘A’

Crown ‘B’

Date



Pilots Slide Rule Dial Ring (‘Outside scale’)





24-Hour Hand (PM Side)

Red tip indicates PM time

(12:00 PM to 11:59 PM)

24-Hour Hand (AM Side)

White tip indicates PM time

(12:00 AM to 11:59 AM)

Minute Hand

Second Hand

Hour Hand

Date Indicator

To set Base or ‘0’ position and then the time/date:

1) If your model features a screw down crown, unscrew crown ‘A’ from case.

2) When the second hand reaches 12:00, pull crown ‘A’ out two ‘clicks’. This will stop the second hand at the 12:00

or ‘0-position’.

3) With the crown ‘A’ pulled out two ‘clicks’, turn the crown clockwise until the PM side of the 24-hour indicator

(red tip side in this example) is pointing to 12:00 or ‘0-position’ (minute hand should also be pointing at 12:00 or

‘0-position’). Note: The AM side of the 24-hour indicator hand (white tip side in this example) indicates AM hours

(12:00 am through 11:59:59 am), while the PM side of the 24 Hour hand (red tip side in this example) indicates PM

hours (12:00 pm to 11:59:59 pm)

4) Push crown ‘A’ in 1 ‘click’. Rotate crown ‘A’ clockwise to move the hour hand until you see the date change. If

the hour hand is not already at the 12:00 position, continue to rotate the crown clockwise to move the hour hand to

the 12:00 position. This sets the hour to ‘midnight’ ensuring the date will change at night, rather than during the day.

5) Set the current date by rotating crown ‘A’ counterclockwise until the current date is shown in the date window.

The watch is now set for ‘midnight’ on the current date.

6) Pull crown ‘A’ out one ‘click’ to the time setting position.

7) Rotate crown ‘A’ clockwise to set your current time. Keep in mind that your watch is currently set at ‘midnight’

on today’s date.

8) Push crown ‘A’ to the closed position. The time, date and 24-hour time are now set. If your model features a

screw down crown, be sure to screw crown ‘A’ into the case.

Movement Caliber B877 Quick Setting Instructions

Crown ‘A’

24-Hour Time ‘AM’ Scale

24-Hour Time ‘PM’ Scale

Crown ‘B’

Flying distance and other navication calculations as well as

general calculations can be performed using the slide rul

located around the dial. This slide rule is not capable of

displaying decimal places, and as such, should only be used

as a general reference and as an alternative to more accurate

calculations.

Turning the crown, located at the 8:00 position, in either

direction allows the Outside Scale surrounding the dial to be

rotated.

Use of the Navigation Calculator

Crown for

rotating the

Outside Scale

surrounding

Inside Scale on

the dial

Outside Scale

(surrounding the dial

next to the case edge)

Inner scale

(just inside the

Outside rotating

scale)

Navigation Calculator

1. Calculation of time required

Question :

Solution:

Speed Index on Inner Scale

(triangle mark at 12:00 position)

How long does it take an airplane

flying at 180 knots to fly a distance

of 450 nautical miles?

Rotate the lower left crown in either

direction to set the '18' mark on the

'outside' scale to the "Speed Index" at

12:00. At this time, the point on the

inside scale that is aligned with '45' on

the outside scale indicates (2:30). The

answer is 2 hours and 30 minutes

2. Speed (Ground Speed) calculation

Question:

Solution:

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?

Rotate the lower left crown in either

direction to align the '24' on the outside

scale with '1:20' (80) in the inside scale.

At this time, '18' is aligned with the

"Speed Index" on the inside scale and

the answer is 180 knots.

mark on

Inner Scale

mark on

Outside Scale

3. Flying Distance Calculation

Question :

Solution:

What is the flying distance traveled

in 40 minutes at a speed of 210

knots?

Rotate the lower left crown in either

direction to align the '21' on the

Outside Scale with the 'Speed Index' on

the Inside scale. The '40' of the Inside

scale is now pointing to '14'. The

answer is 140 nautical miles.

4. Fuel consumption rate calculation

Question:

Solution:

If 120 gallons of fuel are consumed in

30 minutes of flying time, what is the

fuel consumption rate?

Rotate the lower left crown in either

direction to align the '12' on the Outside

scale with '30' on the Inside scale. The

'Speed Index' on the Inside scale now

points to '24' on the Outside Scale. The

answer is 240 gallons per hour.

5. Fuel consumption calculation

Question:

Solution:

How much fuel is consumed in 6

hours at a fuel consumption rate of

250 gallons per hour?

Rotate the lower left crown in either

direction to align the '25' on the Outside

scale with the 'Speed Index' on the

Inside scale. The 6:00 is aligned with

'15'. The answer is 1,500 gallons.

6. Maximum flying hours

Question :

Solution:

With a fuel consumption rate of 220

gallons per hour and a fuel supply of

550 gallons, what is the maximum

flying hours?

Rotate the lower left crown in either

direction to align the '22' on the

Outside scale with the 'Speed Index' of

the inside scale. The '55' of the Outside

scale is now aligned with '2:30' on the

Inside scale. The answer is 2 hours and

30 minutes.

7. Conversion

Question:

Solution:

How do you convert 30 miles into

nautical miles and kilometeres?

Rotate the lower left crown in either

direction to align the '30' with the

'STAT' mark on the Inside scale. You

will notice that '26' is aligned with the

'NAUT' mark on the Inside scale and

'48.2' is indicated at the

'KILOMETERS' on the Inside scale.

General Calculation Functions

1. Multiplication

Question:

Solution:

What is 20 times 15 (20 x 15)?

Rotate the lower left crown in either

direction to align the '20' on the Outside

scale with the ' ' mark on the Inside

scale. Read the Outside scale at the '30'

mark which is aligned with '15' on the

Inside scale. Figure the number of

decimal places. The answer is 300.

Remember: decimal places cannot be

read on this scale.

2. Division

Question:

Solution:

What is 250 divided by 20 (250 / 20)?

Rotate the lower left crown in either

direction to align the '25' on the

Outside Scale with '20' on the inside

scale. Read the '12.5' mark that is

aligned with the ' ' mark on the Inside

Scale. Figure the number of decimal

places. The answer is 12.5.

3. Reading Ratios

Question:

Solution:

What is 'x' in the calculation thirty

divided by 20 equals 60x

(30/20 = 60x)

Rotate the lower left crown in either

direction to align the '30' on the Outside

Scale with the '20' on the inside scale.

At this time, the asnwer of '40' can be

read from the Inside scale

corresponding to '60' on the Outside

scale. In addition, the ratio of the value

on the Outside scale to the value of the

Inside scale is '30:20' at all positions on

the scale.

4. Determining the square root of a number

Question:

Solution:

What is the square root of 225?

Rotate the lower left crown in either

direction so that the value on the Inside

scale corresponding to '22.5' on the

Outside scale is equal to the value on

the Outside scale corresponding to ' '

on the Inside scale. Read off the answer

of 15 at that location.

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