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Below is a sample form, partly filled
in with details of a proposed trip
from Yellowknife (CFYK) to Fort
Smith (CBDI) – it's based on the D-
13 WAC chart. Notice that the
Flight Level (or altitude, in this case)
is higher than the Safety Altitude,
which I've taken from the biggest
Flight Planning 155
blue figure in the lat/long boxes en
route, plus a bit for mother.
Otherwise, there's not much else you
can usefully put in at this stage, so
get your whizzwheel and see if you
can fill in the rest, given that the
wind velocity is 180/15. If you want
to cheat, the picture above will show
you what it should look like.
The figures for an alternate
aerodrome have been left out for
clarity, but you should always choose
one and work out the figures for it in
the same way, before you go - by
definition, an alternate is for when
you really need one, and there's never
enough time to do things on the run.
When planning a trip with a lot of
legs, my own preference, if there's
room, is to leave a line between each
one, in case you do have to change
things, or you note any differences,
such as wind velocity, and work out
a new groundspeed.
Different flying clubs will have their
own version of the above form, but
this is most like what you will see in
general. The only thing that's missing
is a box for your fuel totals, but it's a
simple slide rule calculation, based
on your flying time against fuel
consumption.
The Dalton Computer
This is a device with a sliding scale
through it, marked with drift angles
and TAS arcs, with a frosted circular
screen on which you can draw the
business end of the triangle of
velocities:
There is a dot in the centre of the
screen, around which is a compass
rose that can be rotated to bring
your heading or track under the
lubber line. All you need to do is
draw in the wind vector to see how
they all relate to each other.
Note: there will be an instruction
book supplied with your computer,
so the instructions given here will
necessarily be brief.
The first thing to do is move the
sliding scale to make your TAS
appear underneath the dot in the
centre of the frosted screen. Then
rotate the screen so the wind
156 Canadian Private Pilot Studies
direction lines up under the lubber
line at the top.
Draw in a line vertically downwards
from the centre dot equal to its
speed in knots. Rotate the screen
again until the track is under the
lubber line. The end of the wind line
will point to a drift arc and a TAS
arc, which you just apply to your
track and airspeed to get the missing
bits, namely the true heading to fly
and the resulting groundspeed which
you use for flight planning. Then
apply the magnetic variation and
compass deviation to get the proper
heading to fly.
CR Series
These were invented by Ray Lahr
and marketed by Jeppesen. They are
circular, with no sliding scale, and
are based on trigonometry (they are
easier to work with one hand, but be
aware that, as the angle of drift
increases, there's a small angular
correction to be applied on top).
Here's how you would work out the
details for the PLOG above:
The cross to the right of the 10 near
the centre of the instrument (bottom
of picture) is the wind velocity
(180/15). Its position to the right of
the main line going towards TC
(True Course) means the wind is
coming from the right, and the
crosswind component is 8 kts.
Looking across from the 80 on the
outside scale, you will see that 5° is
the correction to be applied to
obtain the heading (the white arrow
above the letters TAS must be
opposite the aircraft's TAS for this
to be correct).
The headwind component is 12 kts,
which should be subtracted to obtain
a groundspeed of 78 kts.
The very small ones have some
functions left out, which are
unimportant to most aircraft anyway,
to pack everything else in, but don't
get one too small, because your eyes
won't see the print so well at night
(see the Human Factors chapter).
Slide Rule
On the other side of both types,
there is a circular slide rule, with the
60 point on the inner scale
conveniently marked to make speed
and time calculations easier:
Flight Planning 157
It can be positioned against fuel
quantity or distance on the outer
scale to read time on the inner scale.
As with any slide rule, you need the
　
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