Tank Investigation of the EDO Model 142 Hydro-Ski Research Airplane Page: 4 of 22
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os also tested. This ski provided greater lift and therefore reduced the
load on the fuselage permitting take-off with the available thrust even
:*: with the well.
**, The lines of the large main ski, which is the ski shown in figures i
* * and 2, are presented in figure 3. The lines, in general, were similar
to those of the main ski used in the tests of reference 2 except that
the dead rise was washed out" toward trd the stern to provide a better
fairing with the well when in the retracted position while the upper
surface was refaired to eliminate the vertical ies. This ski hid a
loading of 365 pounds per square foot (full size). The small main ski
which had a loading of 475 pounds per square foot (full size) was a
.88-scale model of the large main ski shown in figure 3.
The location of the large main ski can be seen in figure 1. The
small main ski was placed sothat its pivot point (see fig 3) would be
in the same position n in relation to the fuselage. Both skis were
attached to the fuselage by the fired struts ahorn in figure 3. The
skis were fixed in trim since they were to be fixed for wter water operation
on the full-size airplane. For snov and ice operation they would be
free to pivot about the pivot point shown
The tail ski was a O.42-scale model of the large main ski. The
wing-tip skids are shown in figure 4.
Scale e or r the model (3500 b static thru t full size) was
supplied by a jet ducting system and an ejector (see fig. 5) operated
by compressed air. The duct had to be split just at of the entrance to
permit insertion of the towing staff. This arrangement dd not allow
scale air inflow to btained. The tests of reference 5, however,
indicated that the jet air inflow had only a slight effect an the
hydrodynami c characteristic.
Take -Off Tests
General.- The test setup with the model floating at the test gross
weight (7,850 1b, full ie) i shown in figure 6. The modl a free
to trim about the center of gravity and free to rise but was restrained
laterally and in roll and yaw. Trim is defined as the angle between
the disturbed water surface and the fuselage reference line.
The ruddervatora were movable over a range of deflections from
-300 to +300 measured perpendicular to the hinge lineo
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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/m1/4/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.