Evening star., 1936-11-29

'olutiol VI Tie local CIVIC alr-Lermlnal
The main cabin space would be 40
by 10 feet, with cargo space beneath
the floor. Sound insulation would keep
the noise level within the cabin be.
low that of Pullman.
The weight of cabin equipment plus
crew would amount to about IL per
cent of the total weight of the air.
plane; the airplane structure to rs
per cent Of the total, power plant
weight to % per cent, and useful load
to 81 per cent, leaving about per
cent as a margin for manufacturing
variations and additional equipment.
Going beyond the "airplane of to-
morrow" the engineers anticipated
an airplane of the near future en-
bodying better high lift devices and
consequently making possible an air.
plane smaller in proportion to weight
than those of today. They anticipate
wing loading of 40 pounds per
square foot as compared with a load
ing of "a pounds for their "airplane
of tomorrow"
They forecast changes in engine
design leading to drastic reductions
in frontal area and improved methods
of cooling, resulting in saving Of
more than Is per cent IN total drag of
the airplane. They do not look for
the use of Diesel engines in the future
airplane because of the steady re-
ductions now being made in the fuel
consumption of conventional carbu-
rotor engines. Except for smaller
wing area and smaller power plants,
the future airplane would look much
like tomorrow's airplane, they said,
but would have much less gross weight
for the same payload, range and speed
and a far lower direct operating cost.
The authors in conclusion refer to
the great social and political implica-
tions in the availability of a common
carrier able to operate between any
two points in the North American
Continent overnight.
A S IF to bear out the forecasts of
DR.. Hunsaker and Mr.. Mead,
United Air Lines during the past week
ordered SO Pratt g. Whitney twIn-row
Wasp 14-cylinder engines developing
1000 horsepower each, with a maxi
mum of 1,150 horsepower for take-od
and climb. The new engines are being
installed in % twin-engined Douglas
transports.
Using only 81 per cent of available
engine power, it was explained, the
United ships will be able to cruise
more than l80 miles per hour, with a
range of 1900 miles nonstop. With
only one engine operating, the airplane
not only can maintain full flight, but
can climb 2 miles.
The twin-row engines, to be used
for the first time in passenger land
planes, have weight Of only 20 ounces
per horsepower. Automatic mixture
control and constant speed three-blads
propellers are used.
LIVERY square mile Of the United
- States now has been charted fer
the aviator. With the publication Of
the eighty-seventh unit in series, the
Bureau of Air Commerce now has
completed its sectional aeronautltA
charts, years ahead of the original
schedule. thanks to the Public Works
Administration.
The new charts. compiled and
printed for the bureau by the Coast
and Geodetic Survey, if joined to-
gether at their edges, would make a
map of the United States about 80
feet wide and 20 feet high, showing
every detail in the country OF lmpor-
tance to the airman.
The charts, each about 40 by 20
inches in size, are designed especially
for use in croSs-country air naviga-
ton. They show political boundaries,
rivers and lakes, cities and towns, rail-
roads, Federal and State highways,
elevation of the ground above sea
level, airports, landing fields, seaplane
anchorages, beacon lights. radio sta
tionS, outstanding distractions to
fight, such as high monuments,
bridges or isolated factory buildings,
and magnetic variations.
Each chart, based on the best Of
previous maps, has been checked by
flight crew of pilot and checker. fly
ing back and forth over the entire
area, noting features to be added or
revised on the map