Tank Tests of a 1/7-Size Dynamic Model of the Grumman XJR2F-1 Amphibian to Determine the Effect of Slotted- and Split-Type Flaps on Take-Off Stability - NACA Model 212, TED No. NACA 2378 Page: 2 of 22
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NACA RM No. L7A07 3 1176 01436 4989
NATICGAL ADVISORY COMMITTEE FOR AERONAUTICS
* . RESEARCH MEMORANDUM
Bureau of Aeronautics, Navy Department
TANK TESTS OF A 1/7-SIZE DYNAMIC MODEL OF THE GRUMhAN XJR2F-1
AMPHIB3N TO DETERMIfE 'THE EFFECT OF SLOTTED-
AND SPLIT-TYPE FLAPS ON TAKE-OFF STABILITY - NACA MODEL 212
TED NO.. NACA 2378
By Norman S. Land and Koward Zeck
Additional tests of a 1/7-size model of the Grumman XJR2F-1
amphibian were made in Langley tank no. 1 to compare the behavior
during take-off of the model equipped with split- and slotted-
type flaps The slotted flay had a large effect on locating the
forward center-of-gravity limits for stable .take-offa . Stable
take-offs within the normal operating.range of positions of the
center of gravity could be made with the split flaps deflected. 150
or with the slotted flaps .deflected less than 200. At flap
deflections required for similar .take-off stability, the use of
split flaps. resulted in lower take-off speeds than the use of slotted
flaps. An increase in forward acceleration from 11 to 4.8 feet
per second per second moved the. center-of-gravity limit forward
approximately 3-percent mean aerodynamic chord.
The take-off and landing stability of a 1/7-size powered dynamic
model of the Grumman XJR2F-I amphibian with slotted flaps has been
described in reference i. These results indicated that the range
of positions of. the center of gravity fors.table take-off was well
aft of the desired oierating-range if -flap deflections of 200 or
more were used. In order to take off frcm rough water at as low a
speed as possible, this airplane was supposed tb have satisfactory
take-off stability with flap deflections of 45o. With such large
Chance iIed E;E
. . . - ..- j -
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Land, Norman S. & Zeck, Howard. Tank Tests of a 1/7-Size Dynamic Model of the Grumman XJR2F-1 Amphibian to Determine the Effect of Slotted- and Split-Type Flaps on Take-Off Stability - NACA Model 212, TED No. NACA 2378, report, February 6, 1947; (https://digital.library.unt.edu/ark:/67531/metadc64241/m1/2/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.