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HP HP-67 - Page 110

HP HP-67
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106
Function
Keys
Example:
In
a
rather
overoptimistic
effort
to
break
the
speed
of
sound,
high-
flying
pilot
Ike
Daedalus
cranks
open
the
throttle
on
his
surplus
Hawker
Siddeley
Harrier
aircraft.
From
his
instruments
he
reads
a
pressure
altitude
(PALT)
of
25,500
feet
with
a
calibrat-
ed
airspeed
(CAS)
of
350
knots.
What
is
the
flight
mach
number
speed
of
aircraft
M
=
speed
of
sound
if
the
following
formula
is
applicable?
ST
e
73]
Method:
The
most
efficient
place
to
begin
work
on
this
problem
is
at
the
innermost
set
of
brackets.
So
begin
by
solving
for
the
quantity
2
[
350
]
and
proceed
outward
from
there.
661.5
Press
Display
350
661.5
€
a
Square
of
bracketed
quantity.
208
1
350
18
Contents
of
left-hand
set
of
brackets
are
in
the
stack.

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