ASA Electronics AirClassic E6-B Manuale utente
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E6-B Flight Computer Instructions
This instruction booklet can be used with the three
different E6-B models available from ASA. If you
have a different model than the one depicted, some
parts of your computer may appear slightly different
from the computers pictured in this booklet. How-
ever, the calculations are accomplished with the
same method and produce the same answers.
© 1992 – 2000 ASA
Aviation Supplies & Academics, Inc.
7005 132nd Place SE
Newcastle, WA 98059-3153
All rights reserved. Reproduction in whole or in part of this text is
strictly prohibited and unlawful without the written permission of
Aviation Supplies & Academics, Inc.
ISBN 1-56027-421-2
ASA-E6B
3
Contents
Page
Instructions for Using ASA Flight Computer...... 4
The Slide Rule Side .......................................... 5
Time, Speed, and Distance Problems .............. 8
Fuel Consumption Problems ........................... 11
Conversions .................................................... 13
Nautical to Statute Miles ............................
13
U.S. Gallons to Imperial Gallons ................
15
Quantity/Weight Conversions.....................
16
Using the Altitude and Speed
Correction Windows ........................................ 18
True Airspeed and Density Altitude ................ 18
Converting Mach Number to True Airspeed.... 20
True Altitude .................................................... 21
Feet Per Mile vs. Feet Per Minute................... 22
Off-Course Problems ...................................... 24
The Crosswind Table ...................................... 27
The Wind Side of the Slide ............................. 28
Determining Winds in Flight ............................ 32
Answers to Sample Problems ......................... 37
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Instructions for Using ASA Flight Computer
Your ASA E6-B Flight Computer has two main
parts: a circular slide rule side for making quick
calculations, and a wind side for computing ground
speed and wind correction angle. The slide portion
of the circular slide rule side also includes quick-
reference material.
Figure 1
5
The Slide Rule Side
The term “circular slide rule” shouldn’t be intimidat-
ing. This side of your computer simply consists of a
rotating disk with numbers on the
middle
scale,
which when set against similar numbers on the
fixed portion (
outer
scale), allows you to solve
problems of time, speed, and distance, calculate
fuel consumption, and make conversions be-
tween measurements such as statute and nauti-
cal miles. The
inner
scale on the rotating disk is
graduated in hours. The slide rule side also has
“windows” that you will use to solve airspeed and
altitude problems.
You can see that the number 60 on the rotating
disk is marked differently than the other numbers.
That is because most of your problems will be
concerned with time —“something” per hour, either
miles or gallons. Before you get to that, you should
learn how to read and interpret the numbers on both
portions of the slide rule side.
Rotate the disk until all of the numbers on the
middle scale match up with the numbers on the
outer scale —10 will be at the top. However, that
number “10” may be read as “.1,” “1,” “100,” or
“1,000”
depending upon the context of the problem
.
For now, read it as 10. The next number to the right
is 11, so each life (or mark) of calibration between
the two numbers is equal to .1, and you would read
them as 10.1, 10.2, 10.3, etc. If you were solving a
problem involving 1,000 pounds of fuel, the number
10 would be read as 1,000, and each calibration
would be equal to 10 pounds, and the 11 would be
read as 1,100 pounds.
See
Figure 1.
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Now look at the number 15 on the disk. Between 15
and 16 each calibration mark is equal to .2 and
would be read as 15.2, 15.4, etc. If you were solving
a problem with an airspeed of 150 knots, the first
calibration past 15 (150 in this case) would be 152.
The spacing changes again at the number 30,
where each calibration becomes .5, and at 60,
where each calibration equals 1. Before you read a
value from the disks, be sure you understand what
each line of calibration is equal to.
You will use the slide rule side to establish
ratios. With the numbers matched, the ratio is 1 to
1. Now set the number 60 (the rate arrow) directly
opposite to (or, “lined-up” with) 12 on the outer disk
(
see
Figure 2). Notice that all of the numbers on the
outer disk are exactly twice the value of the num-
bers on the inner disk: 90 is opposite of 180, 15 is
opposite of 30, 3.5 is opposite of 7.0. You will use
these ratios in solving time-speed-distance and fuel
consumption problems.
Look at the inside scale on the disk, where the
lines of calibration look like clock times: 9:00, 6:00,
etc.— these express hours. The inner scale is in
hours and the middle scale is in minutes. 1:10 is
directly below 70; one hour and ten minutes is the
same as seventy minutes. 5:00 is printed below 300
minutes, and five hours is the same as 300 minutes.
To convert minutes to seconds, place the rate arrow
opposite to the minutes on the outer scale and read
seconds opposite to the “seconds” arrow, just to the
right of 35 on the inner scale.
7
Figure 2. Line up the number 60 (the rate arrow) with
the number 12 on the outer disk (or, scale).
8
Time, Speed, and Distance Problems
The rate arrow on the disk is always set to indicate a
value per hour on the outer scale. There are three
basic time-speed-distance problems. In two of these
problems you know the rate, while in the third prob-
lem, the rate is part of the answer you are looking for.
To find the Time En Route, let’s assume you
know your airspeed is 150 knots (nautical miles per
hour).
1. Set the rate arrow to 150.
See
Figure 3.
2. You have determined the distance to your
destination to be 245 nautical miles. Speed
and distance are always on the outer scale;
245 is halfway between 24 and 25.
3. Look directly opposite to that value on the
inner scale to find the Time En Route. It is
between 1:35 and 1:40. There are five cali-
bration marks on the middle scale between
1:35 and 1:40, and 245 NM on the outer scale
is closest to the third calibration, or one hour
and 38 minutes.
To find out how far you can go if your fuel
endurance is 4.5 hours and your ground speed is
known to be 125 knots:
1. Set the rate arrow at 125 on the outer scale.
See
Figure 4.
2. Find 4:30 on the inner scale.
3. The value on the outer scale is slightly more
than 55. You know that 4 hours at 125 knots
should cover 500 miles, so the outer scale is
read as 500, not 50 or 5,000, which makes
each large calibration mark worth 10 nautical
miles. The answer is 564 nautical miles.
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Figure 4
Figure 3
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In the final and most common type of time-speed-
distance problem, the time and distance are known,
and you need to solve for unknown speed. The
rate arrow represents the answer. You will have
flown between two known ground reference points
26 NM apart and checked the time between them to
be: 13 (thirteen minutes, that is, not thirteen hours).
1. Set thirteen minutes on the middle scale op-
posite to 26 on the outer scale.
See
Figure 5.
2. The rate arrow points to your ground speed,
120 knots.
Try these time-speed-distance problems:
(Answers are on Page 37)
SPEED TIME DISTANCE
1. 125 KTS 524 NM
2. 2:30 345
3. 110 KTS 1:40
4. 0:24 44
5. 95 1:24
Figure 5
Indice
