Acceleration Measurements During Landing in Rough Water of a 1/7-Scale Dynamic Model of Grumman XJR2F-1 Amphibian - Langley Tank Model 212: TED No. NACA 2378 Page: 3 of 14
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CNF TAL NACA 1W No. LTE14
a utility transport and for air-sea rescue work, and therefore must
be seaworthy and structurally satisfactory for rough-ater take-offs
and lanin,. Tests of a --size powered dynic model ofthe
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Gr Xan 2F-1 amphibian wre made in Langley tank no. I to determine
the landing behavior in rouh water and to measure the nom and
angular acceleration experienced by the model during these landings.
The model was lande into oncoming vaves 4L4 and 8.0 inches high
with lengths of vaves from 10 to 50 feet These tests provide the
designer with expert ent~l data for comparison with theoretical
water load calculations.
MODE L AND INSTR WIT1'ATION
The model ued for the tests was a --size ~ call similar
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model with powered propellers. A detailed description of the odel
is given in reference i; important dimeneions are given in table I.
The model was fixed in yaw and roll but had freedom in the
plane of symtry (trim -50 to 200, rise 14 in., and fore and aft
motion, 11 in,). Two linear acaceler tera ere mounted within
the model. One a located on the axis of rotation. (the center of
gravity) and oriented to respo to accelerations noa to the
keel. A second accelerometer vas mounted 1 foot afV of the center
of gravity and also responded to accelerations normal to the keel.
For each landing, time histories of the actions of the model with
resct tothe carriage, the passage of wave creasts, the speed of
the carriage, and the accelerations were recorded. Angular accelerations
were calculated from the linear accelerations obtained with the
two accelerometers. The test setup, whih is ah in figure i,
is described in detail in refrece 2. The trim is the angle between
the forebodys kee at the step and the horizontal.
The test procedure vae, in general, almIlar to that described in
reference 2. The towing carragv was accelerated to a speed such
that the model a airborne ;the model was trmed to approximately
the desired landing trim by use of the elevators; and the carriage
as then decelerateId at a rate of two feet per second per second,
thus the model was allowed to land, Safficint propeller tu
wa used so that the resultant horizontal force as approximately
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Land, Norman S. & Zeck, Howard. Acceleration Measurements During Landing in Rough Water of a 1/7-Scale Dynamic Model of Grumman XJR2F-1 Amphibian - Langley Tank Model 212: TED No. NACA 2378, report, May 6, 1947; (https://digital.library.unt.edu/ark:/67531/metadc64281/m1/3/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.