Flutter Tests of a 1/25-Scale Model of the B-36J/RF-84F Tip-Coupled Airplane Configuration in the Langley 19-Foot Pressure Tunnel Page: 2 of 81
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NNATIONAL AJISORY COMMITTEE FOR
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.CER TESTS OF A 1/25-SCALE MODEL OF
-84F TIP-COUPLE) AIRPLANE CONFIGUPJ
LANGLEY 19-FOOT PRESSURE TUNNEL
CLEARANCE NO. AF-218
By Robert H. Neely
SUNMARYTests of a 1/25-scale model of a B-36J/RF-84F tip-coupled airplane
were made in the Langley 19-foot pressure tunnel in order to evaluate the
flutter characteristics where bomber-body freedoms are allowed and to
obtain an indication of the dynamic stability characteristics of the con-
figuration. The bomber model was supported by a gimbal which moved on a
vertical rod and permitted four degrees of body freedom. Both the fighter
and bomber models were scaled in geometry, mass, and inertia; in addition,
the bomber model was elastically scaled. The variables studied in the
investigation were the skew angle of the fighter-bomber coupling, fighter
longitudinal position, fighter and bomber loading, angle of sideslip,
degrees of body freedom, and the number of fighters. In this report, the
flight technique employed is described in some detail. The overall flight
behavior is discussed, and certain limitations in interpreting the results
in terms of full-scale flight behavior are noted. Data pertaining to flut-
ter characteristics and to the motion of the fighter relative to the bomber
are presented and discussed briefly.
Free-to-roll coupling of fighter airplanes to the wing tips of
another airplane poses dynamic stability problems including those asso-
ciated with flutter which are more complex than those encountered with
single airplanes. In reference 1 it was found that, for satisfactory
flight behavior of coupled airplanes, a certain amount of restoring
moment must be supplied by the fighter when it is displaced in bank
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AERONAUTICS
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Neely, Robert H. Flutter Tests of a 1/25-Scale Model of the B-36J/RF-84F Tip-Coupled Airplane Configuration in the Langley 19-Foot Pressure Tunnel, report, January 11, 1956; (https://digital.library.unt.edu/ark:/67531/metadc53256/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.