Accelerations and bottom pressures measured on a B-24D airplane in a ditching test Page: 2 of 31
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NATIONAL ADVISORY COMMI'TTTEE fOR AERONAUTICS
MEO'I,ORANP.DUM {FPO RT
for the
Army Air Forces, Air Technical Service Command
ACCEL ATIOITS AND BOTTOM, PEStURS MEASURED ON A
B-2'D AIRPLANE IN A DITCHING TEST
By Margaret F. Steiner
S TUWMAR Y
During the full-scale ditching of an Army B-2D air-
plane in the James River, accelerations near the center
of gravity and bottom pressures were measured. The data
are oresen ted in the form of time-history plots of the
recorded longitudinal, normal, and transverse accelera-
tions and of the bottom pressures.
The airplane contacted in a tail-down attitude,
barely left the water, entered again and rocked forward
so that the nose and most of the fuselage dug in deeply.
During the first impact the high pressure area started
at the rear of the bomb-bay section and progressed to
a point near the empennage and on the second impact
it progressed forward from a point just aft of the bomb
bay until most of the nose was subjected to water load.
In most cases the maximum recorded pressure at each
station exceeded the capacity of the instruments being
greater than 30 to 50 pounds per square inch;
The maximum recorded acceleration was 2.7g acting
in the rearward direction along the longitudinal axis.
The accelerations along other axes were negligible.
INTRODUC TION
The various aerial combat units operating over
water have been faced with the serious problem of making
emergency landings on water in such a manner as to
minimize hazard to personnel.
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Steiner, Margaret F. Accelerations and bottom pressures measured on a B-24D airplane in a ditching test, report, November 1944; (https://digital.library.unt.edu/ark:/67531/metadc61135/m1/2/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.