Tank Investigation of the EDO Model 142 Hydro-Ski Research Airplane Page: 3 of 22
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NACA M SL1I24
other characteristics of high-speed operational aircraft, such as jet
propulsion and swept wings. The airplane was to be capable of operation
from water, snow, and ice and for this purpose was fitte with a main
ski, a tail ski, and ing-tip askid.
At the request of the U. S. Air Force, an investigation was con-
ducted in ley tank no. 2 in cooperation with the contractor to
determine a hydrodynamically satisfactory configuration or his airplane.
This paper presents the results of tests of two configurations,
either of which might be use for the full-scale airplane. e con
figuration included a large ski and a ski vell; the other, a small ski
without a well. These two configurations were selected after an investi-
gtion of the effects on the hydrodynamic characteristics of the various
design parameters involved. These parameters included ski angle, verti-
cal and horizontal location of the ski. Data from these preliminary
tests were not of a nature to permit extensive generalizations on the
properties of hydro-skis and therefore are not presented herein.
DESCRIPTION OF MODEL
A -size powered-dynamic model of the proposed airplane was con-
structed at the Langley Laboratory for use in the tank investigation.
The general arrangement of the model is shown in figure i. Photographs
of the model are shown in figure 2. The principal characteristics of
the airplane are presented in table I.
Tests in the Langley 300 7 by 10foot tunnel (reference 4)
indicated that the stability of the oriinal de woul be improved bya
refairing the aft portion of the fuselage to reduce its curvature and
by adding a thin plate extending aft of the sternpost. These changes
were incorporated in the tank model (see figs. I and 2) an all results
presented are for the model thus modified.
The model was equipped with movable ruddervators of scale dimensions.
Scale-ize versions of the wing alato and fences to be included in the
full-scale airplane were installed on the model.
The original proposa included a relatively small min ski together
with a well to permit retraction into the fuselage. In preliminary tests
this configuration ha more resistance than the thrust available for
take-off with the proposed power plant. Elimination of the ski well
Since retraction into a well remained desirable aerodnmically a larger
main ski with a matching well geometrically similar to the original was
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Ramsen, John A.; Wadlin, Kenneth L. & Gray, George R. Tank Investigation of the EDO Model 142 Hydro-Ski Research Airplane, report, September 24, 1951; (digital.library.unt.edu/ark:/67531/metadc64707/m1/3/: accessed January 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.