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HP HP-21 - Page 53

HP HP-21
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Example
2:
An
aircraft
pilot
reads
a
pressure
altitude
(PALT)
of
25,500
feet
with
a
calibrated
airspeed
(CAS)
of
350
knots.
What
is
the
flight
mach
number
(M)
=
speed
of
aircraft
speed
of
sound
if
the
following
formula
is
applicable?
M:
v
[(1
+
0.2[5—6’%]2
)”
—_—
-5.2656
0.286
1-6.875
x
1076
PALT
+1
-1
Method:
The
most
efficient
place
to
begin
work
on
this
problem
is
at
the
innermost
set
of
brackets.
So
begin
by
solving
for
the
CAS
|?
quantity
[——:l
and
proceed
outward
from
there.
661.5
Press
350
ERED
661.5
(<]
(ENTER+
B3
261
3.5
1
1|
ENE
6.875
B4
R
6
25500
[x]
[=]
5.2656
N
X1+
286
1
]
1[5
5]
I
(=)
Display
1.06
0.21
6.875
00
6.8750000
-06
2.76
1.58
0.14
0.84
Square
of
bracketed
quantity.
Contents
of
left-
hand
set
of
brackets
are
in
the
stack.
Contents
of
right-hand
set
of
brackets
are
in
the
stack.
Mach
number
of
the
flight.

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