THE BATTALION
Thursday, September 28, 1967
College Station, Texas
Page 7
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Solid-fueled Boosters To Compete With Liquid Fuel
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How do you stop a firecracker
in the middle of a bang? And
start it again?
This is very nearly the prob
lem that the designers of tomor
row’s big solid-fueled rockets face
as they seek ways to make their
boosters competitive with the
liquid-fueled models.
Today, liquid-fueled rockets
have it over the solids in the
manned spaceflight program. Al
though the solid-fueled Minute-
man plays a defense role with its
intercontinental capability, there
are definite problems in rating
them for manned flight.
Yet, NASA Administrator
James Webb predicted here re
cently that competition between
solids and liquids would again
open up. And it is at A&M that
a team of space researchers are
studying the tiny structure of
solid fuels in an attempt to de
termine their behavior and predict
failures.
THE GROUP is headed by Dr.
W. B. Ledbetter who believes that
the methods of study developed
may eventually determine not
only why rockets blow up, but
also why auto tires tear apart.
The group, including L. Dale
Webb, formerly with Rocketdyne,
and Davie Elliott, a Ph.D. candi
date, has been stretching, squeez
ing, twisting, heating, aging and
chilling solid fuel to see whei’e
the tiny cracks begin.
“A rocket with a crack in its
fuel becomes a bomb,” says re
searcher Webb.
Elliott was instrumental in de
veloping a new device last year
which can accurately stretch or
compress materials while they
are under a microscope.
“OUR PURPOSE had been to
develop a microstructural appa
ratus and to learn whether other
people’s hypotheses wei-e signifi
cant,” says Ledbetter. The re
searchers have found some error
in theory.
Composite rocket fuels are sort
of a raisin pudding - affair—with
the rubber compound “binder”
being the pudding and the oxid
izing compound “filler” being the
raisins. The A&M researchers
know that the beginnings of fail
ures more often occur at the
points of contact between binder
and filler.
SOLID FUELS will become
more competitive with li'qtfid
fuels when some way is found
to give them “start, stop, restart
capability and throttleability,”
says Webb.
At present, the researchers
point out, the retro-rockets used
in the Mercury and Gemini man
ned spaceflight programs were
solids and there’s a whole family
of small vector control rockets
which are used to keep satellites
facing - one way.
Engineering Talk
To Be Delivered
By Rice Gradute
G. E. Nevill of Houston will
be featured Wednesday (Oct. 4)
in the first Engineering Lecture,
a series inaugurated by the Col
lege of Engineering - this fall, an
nounced Dean Fred J. Benson.
A staff engineer for Cameron
Iron Works, Nevill will address
students, faculty and the public
on “From Titusville to Cook In-
lett—The Evolution of the Oil
Well Drilling Industry and the
Outlook for Engineering Respons
ibilities.”
The 3:30 p.m. lecture will be
in the Architecture Auditorium.
The Engineering Lecture Series
was set up to present industry,
education and government repre
sentatives with addresses centex - -
ed on engineering fx - ontiers, in-
dusti-y, society and education.
Nevill has been in oil field
drilling and production equipment
design and manufacture most of
the 39 years of his career. The
Engineex-ing Series speaker has
been assistant chief engineer,
fox - ge and ordnance division chief
engineer, standards engineer and
quality control manager at Cam
eron since 1948.
The Registered Professional
Engineer is a fellow of the
American Society of Mechanical
Engineers, chairing the ASME
South Texas section and its pe
troleum division.
The 1928 Rice graduate and
member of Tau Beta Pi sei - ved
in the Southwest Pacific Theater
with the Sixth Army Headquar
ters dui-ing World War II. He
organized and commanded a re-
sei - ve x - eseai - ch and development
unit and is a retix - ed colonel,
U. S. Corps of Engineers, USAR.
Nevill’s son, Gale Jr., is acting
chairman of the Engineering
Mechanics Department, Univer
sity of Florida.
59 !