9.
E6B Flight Computer
CHASE-DURER
10
11
12
13
14
15
1
6
1
7
1
8
1
9
2
0
2 1
2
2
2
3
4
2
25
0
3
5
3
40
4
5
5
0
5
5
7
0
80
90
6
0
6
5
5
7
85
95
SQUADRON
COMMANDER
31
60
40
20
10
30
50
10
8
2
4
6
9
3
12
6
8
4
12
6
2
10
5
3.
T
U
A
N
0
4.
T
AT
S
1
0
1
1
1
2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
20
2 1
22
23
24
25
3
0
4
5
50
5
5
70
80
9
0
H
MP
5
6
75
85
9
5
How to use the E6B Flight Computer Bezel
When doing calculations, the rotating bezel will represent
the time and the face/dial the units (distance, pounds,
gallons, etc.)
¤
Let’s try an example:
You’re in your car on the freeway traveling at
60
miles-
per-hour. You’ve been traveling for
2.5
hours. How far
have you gone?
¤
Solution:
Turn the bezel so that the red numeral
on the bezel
(which represents 1 hour) is directly over the “
60
” on the
face at 12 o’clock (which represents the 60 miles traveled
in 1 hour). Directly below the numeral
25
(2.5 hours) on
the bezel you should see the numeral
15
on the face. The
15
represents the significant digits of the answer and we
must decide whether there should be
none
,
1
or
2
zeros
after the
15
.
10
The
E6B
Flight Computer is based on the principle of the slide rule. The unit of measurement is the base
10 logarithms (log10). These instructions cover only the basics of using the
E6B
Flight Computer
Bezel/slide rule. A more complete description may be found in your public library or on the internet.
How to read the scale
The most important technique to master is reading the scale. The numbered tick marks can represent a
range of values. For example, on the scale on the face of the watch, the numeral
30
to the left of the
letters “NAUT” can represent
30
, or
300
or
3000
or
3.0
. The nine tick marks between the
30
and
35
each
represent 1/10 of the distance between
30
and
35
, or
300
and
350
, or
3000
and
3500
, or
3.0
and
3.5
. So
for
3.0
and
3.5
each one of the tick marks represents .
05
; for
30
and
35
,
0.5
; for
300
and
350
,
5
; for
3000
and
3500
,
50
. You can see it is important that you keep track of the range that each interval
represents.
10
95
55
MPH
65
10
5
9
55
P
M H
65
24
25
1 4
1 5
1 6
