. • •
THE BATTALION
Wednesday, May 20, 1970
College Station, Texas
Page 3
20, J
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A&M group designs spoiler
to keep aircraft from stalling
A device that gently prevents
an airplane from stalling — a
cause of many air mishaps—is
nearing completion in A&M’s
Plight Mechanics Laboratory.
Called a stall prevention spoiler
by Howard L. Chevalier and his
crew at the Space Technology
Division facility, the system is
being developed to correct one of
the serious problems encountered
in aerial flight.
An aircraft stalls when its
attitude causes loss of lift.
“When a high angle of attack
occurs, the air flow separates
from the wing,” Chevalier ex
plained.
He said that the stall itself is
not dangerous to airplane struc
tures, but resulting loss of flying
speed, altitude and control is.
What he, aerospace engineering
graduate student and pilot Jim
Savage of Sudan and pilot Doug
Pearson of Oil City, Okla., have
done is attach a thin strip of
mettal—the spoiler—to the lower
front edge of the stabzilizer.
When the plane approaches
stall conditions, the spoiler gradu
ally drops into the air stream
from a position flat against the
elevator. It forces the nose of
the craft down—and away—from
stall attitude.
The system, which has been
discussed with the Federal Avia
tion Administration and aircraft
manufacturers, deploys the spoiler
proportionately as stall atttiude
increases.
Chevalier conceived the device
while at NASA’s Ames Research
Center in California.
He sai dthat about 23 per cent
of all air accidents were attrib
uted to staff-induced situations.
A large percentage of agricul
tural-type planes mishaps can be
traced to stall.
“A great deal of flying instruc
tion time is given to showing a
student pilot what a stall is and
how to recover from it,” the vet
eran pilot commented. “A fool
proof system would eliminate the
need.”
The system differs from stand
ard anti-stall devices in that it
applies corrections as a function
of plane attitude. Stall warning
horns, for example, sound when
high stall conditions are imminent.
Then the pilot must react.
The spoiler system is auto
matic, linked to a stall sensing
vane on the wings through a servo
motor that would deploy the
spoiler regardless of pilot action.
Advantages of the A&M lab-
developed system are that it
allows maximum maneuverability
at all flight attitudes except near
stall, is mechanically independent
of the contro Isystem, does not
require changes in standard con
trol systems, can be incorporated
into both new and existing air
planes and does not require pilot
judgment nor physical reaction.
Work at the A&M Research
Annex lab has progressed to link
ing the entire system together for
tests of automatic operation. Al
most 30 hours of air time have
gone into testitng the apparatus
on a Piper PA-18. In tests so
far, an observed has manually
deployed the spoiler, first by
listening for the stall-warning
horn then by watching meter
readngs from the vane sensor.
“In these instances, the observer
acted as the servo motor,” Che
valier explained.
Savage, who is basing his thesis
on the system, did analytical
wok, utilizing in part a report
by professor A. E. Cronk, Aero
space Engineering Department
head, in predicting spoiler geome
tries.
A cooperative student, Larry
Morse of Bedias, designed the
electronics system. Chevalier said
the electronics “black box” is
light-weight, economical and can
be used in almost any plane.
Fabrication of system com
ponents was done entirely in the
lab and the annex Research and
Instrument Shop. Joseph C.
Brusse, engineering research asso
ciate with the shop, inspected
installations.
The Flight Mechanics Lab,
which also conducts research in
improving aircraft lateral con
trol and aircraft response to
atmospheric turbulence, also flies
a Gruman Ag Cat and Beechcraft
T-34B from a runway of the
former Bryan AFB. A fourth
plans, a Beechcraft C-45, is being
restored to flight condition.
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STALL SPOILER—A stall prevention spoiler, part of
which is shown projecting downward from the elevator of
a Piper PA-18, developed by the Flight Mechanic Labora
tory at Texas A&M.
Cheap transport of moon
samples to earth possible
Economical transport to earth
of materials extracted from the
moon is feasible using a technique
practically as old as man’s dream
of space flight.
The method—described among
others, by Edgar Rice Burroughs
in his “Venus” series—employs, a
rocket-powered sled and launch
track to assist in lunar liftoff.
Russell A. Keyes, A&M senior
aerospace engineering student,
has calculated that a channel-type
track along which the rocket sled
would accelerate and ascent stage
could withstand rigors of the
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lunar environment.
In the airless lunar atmosphere,
cosmic and solar radiation would
constantly bombard the launch
track. It would be subjected to
expanding and contracting forces
of extreme temperature differ
ences between the lunar day and
night. Lunar temperatures range
from—236 degrees to 284 degrees
Fahrenheit in 27 days.
“Analysis of the proposed track
indicates it is capable of function
ing throughout the extremes of the
lunar environment,” Keyes stated
in a course report to Dr. Charles
A. Rodenberger, aerospace engi
neering professor.
He also calculated that vibra
tional and frictional problems in
herent in the operation of such a
high speed track can be effectively
overcome.
Keyes, a San Antonio College
graduate who transferred to
A&M, chose “I” beams and “C”
channel of cold-rolled steel and
V^-inch aluminum plating for his
general track design and analysis.
His plan is to fix each beam
rigidly at one end, restrain side
slippage and vertical deflection
by a bolt protruding through slots,
along the lower flange of the
beam.
“Despite these restraints placed
on it, the beam is able to expand
longitudinally, laterally and vert
ically,” he said. “Because of its
ability to expand freely and the
slow temperature rate of change
which it would undergo, theT
thermally induced stresses.” '
Similar bolt slots in the “C”
channel make it easily possible
for track side members to expand
and contract with the lunar tem
perature variation, he added.
The track, consisting of 8>/2-foot
wide sections, would stretch from
12.3 to 33.4 miles across the lunar
surface.
Thanks Old Army
for a great year. We appreciate your business,
and we want you to know it. We sincerely
hope that our dealings have been as pleasant
for you as they’ve been for us. And for the
men that are leaving, come on in and let us
buy your books one more time. We’ll pay the
best price - as always - and shake your hand
one more time.
Loupot's
He doesn’t
deal with
Tarot Cards
to see into
your future.
He doesn’t need them
to see your financial future
revealed.
He’ll help you see it.
And plan for it. Now.
Because the sooner you
start, the less it costs. And
he’ll show you an insurance
program tailored especially
for you.
He can be found in our
campus office. Go find him.
Throw away your Tarot
Cards.
m
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(713) 567-3165
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