Brownsville herald. [volume] (Brownsville, Tex.) 1910-current, 1928-12-30
By W. f. BERCHTOLD
Association Press Aviation Fditorl

ANN ARBOR, Mich. Dee. 2a.-LPl
Students OF aeronautical engineer
ing. whose notions in airplane design
may shape the future Of air trans
%portation. now have another wind
tunnel laboratory in which they may
test their toy-like models without
the expense and danger OF building
full-siEed planes.
Started in 1922. the University Of
Michigan's wind tunnel mas been de-
veloped year by year until now
its builder and master. Prof Felix VI.
Pawlowski. says il Is ready for a
heavy research program that will in
clude studies on types of airplanes
radically different from those now
seen in the air.
The controversy over the relative
efficiency of monoplanes and multi
planes Is far from ended, according
to Professor Pawlowski. who believes
that the m~onoplane's present popu-
larity IS a transItory whim of design
ers. He and an associate, l.. v. Ker-
Der, plan further research with
multiplanes IN the new Michigan
wind tunnel.
THE monopiane is well adapted TO
the present stage Of air transporta-
ton" Professor Pawlowski says. but
when airplane designers are called
upon in future years to construct
trans-oceanic planes big enough to
carry hundreds Of people. the multi
plane-that is. the airplane with
three, four. five or more wing sur
faccs-appears 20 offer g%retaer pcs
sibilities."
Kerber already has carried on
some experiments In the Michigan
wind tunnel during the last three
years with = quadruplc having
four wings set back IN tiers above
each other. The model. developed
to perfect scale or n full-sized ma
chine. proved Ia have hight lift ef-
ficiencv and other characteristics
favorable 20 .operation.
Experts in the industry recognize
that the universities must he de-
pended upon for development Of fu-
ture aerOnautical engineers. Aero
dynamics and other specialized sub
jects in which the a-cronautical en-
gineer must have thorough training
probably can be taught with greatest
Ease and efficiency through compe-
tent university instruction.
Wind tunnels, which are the
laboratories for research IN aero
dynamics-a highly technical field
embracing a study Of %airplanes'
flight propcrties-haye a romantic
appeal 20 the popular imagination.
They make Il possible 20 study
exactly how an a~irplane viii act in
winds Of veiocities up 10 several hun
dred miles an hour. without yer
haildirg the full-sized airplane.
Toy-iike models. built with great
accuracy and precision, are used.
Delicate wires suspend the models
IN the tunnel air stream. and SEN
sitive instruments record the forces
acting upon the model as IL IL were
in flight.
The University OF Michigan wind
tunnel. designed by Professor Paw
lowski. differs from most others At
university. military and commercial
a-eronautical laboratories.
II has a dual return for the air
blown through the main throat or
the tunnel. ~ that the air circu-
lates constantly instead az being.
blown out one end. IL also has n
unique arrangement which makes
possible an adjustment Of the tun-
nel's throat 20 diameters Of five.
six. seven or eight feet. This makes
possible flexibility in it's use for re-
search problems involving airstreams
or various velocities up 70 $50 miles
an hour.