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National Advisory Committee for Aeronautics, Technical Notes - An Analysis of the Airspeeds and Normal Accelerations of Douglas DC-2 Airplanes in Commercial Transport Operation

Acceleration and airSpeed data taken on Douglas DC-2 commercial
transport airplanes operated along the east coast of the United States
during the period from 1935 to l9h0 have been analyzed. The results
show the design maximum level-flight speed would be exceeded, on the

average, once in about 7.5 x 105 flight miles, and the limit gus load
factor would be exceeded, on the average, once in about 1.5 X 10 flight
miles. The DC-2 operations indicate that the flight loads were small
and the route roughness encountered appears to be small in comparison
with the results shown on other routes.

Analyses of acceleration and airspeed data to determine the flight
loads of four different types of airplanes operated in commercial trans-
port service have been reported in references 1 to h. The flight loads
were shown to be influenced by such factors as route, season, operating
speeds, forecasting and dispatching techniques, and prewar and wartbme
operations.

This paper summarizes the results of an analysis of V-G records
taken on Douglas DC-2 airplanes during the period from June 1935 to

December 19h0. The operational life is compared with the operational
lives of other airplanes flown on different routes during the corres—
ponding period.

Fifty-five V—G records representing a total of 12,141 hours of flight
were available for analysis. The records are summarized in table I for
the DC-2 airplanes operated by three different airlines referred to herein
as airlines D, E, and F on scheduled commercial transport routes during
the period from June 1935 to December l9h0. Information supplied with
the records included installation and removal dates, routes flown, and
flight hours per record} Supplementary information was supplied in
occasional cases where unusual flight conditions were experienced, but
no information was supplied on actual operating weights.