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: 4 of 14
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NACA No. N L714 00NIRA 3
zero at contact with, the atern The model remained free to move
fore and aft throughoutmost of the &landng rm in which high impact
accelerations occurred
All of the landings were made with the model syproaching an-
oC avea in a direction perpendicular to their crests. No
att t was made to have the initial landing contact occur on a
predetermined :prt of ave. At least five landing , however,
were mae ot each co edition of vaves to obtain initial contacts
at several parts of the wave All of the landings were made with a
moel grose load, of 65,2 podas (22,600 ,1. ful size), the center
of gravity 'located at 25 percentage aerodynmic chord, and with
plotted -type flape eflete . 5,
Rteoia qt the time histories offtw landins ae reproducE in
figre 2 'and 3. In tak data fromthe records on a accelerations
correspding to impacts wth the water were considered, The large
accelerations that occurred after the model vas thrown clear of the
t aer were caused by contact with a rise stop. In eral the actio
in ve wa violent, the model was thrown clear of the water several
times for each l, in. The average nmmer of pots in which the
model bone clear of the wter.fbr each landing are plotted against
ave l h in figure k. The records howed that the moet evee
imat occurr. pueuent tothe initial pact o the landing and
at speeds between 70 and 90 percent of the mirm fl pee.
i gi~ntia of the daa obtained in ~ s s and in previous tests,
h as reported wt reference 2, indicates h landing trim is not
accelerations, aSnce the 4a m accelerations agen rally occur at
some ave encounter, aubsequent toi initial l k pact. In this te s .
m ave, change in trim during a, single wave encoter hoV9- no
cns'etent variation with respect to"ave lenth. The model "mally
attained t amum tris z between g15 0en 200 afterbouncing le of
the water at speede below the stall. The Xime change in ,tria
that qc urrede drg any one wave ence ter varied from aboutl59 1 to 5.
The a ,rtical acceleatton is piloted ainst i aet e n
in figure 5, or wae heaihts of 4.4 8,0 inches. Tests in 8.
inch s were not mae for ware length less than 1 feet sine
he waves at these aor lengths became rratic (see reference 2),AN '1 111 v
" "
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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/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.