Low-Speed Investigation of the Effects of Single Slotted and Double Slotted Flaps on a 47.7 Degree Sweptback-Wing: Fuselage Combination at a Reynolds Number of 6.0 X 10(Exp 6) Page: 2 of 24
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NACA RM L51E24
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
LOW-SPEED INVESTIGATION OF THE EFFECTS OF SINGLE
SLOTTED AND DOUBLE SLOTTED FLAPS ON A 47.70
SWEPTBACK-WING - FUSELAGE COMBINATION AT A
REYNOLDS NUMBER OF 6.0 x 106
By Ernst F. Mollenberg and Stanley H. Spooner
A low-speed wind-tunnel investigation has been conducted at a
Reynolds number of 6.0 x 106 to determine the effects of partial-span
single slotted and double slotted flaps at various deflections on the
longitudinal aerodynamic characteristics of a 47.70 sweptback-wing -
fuselage combination. The wing had an aspect ratio of 5.1, a taper
ratio of 0.383, and NACA 64-210 airfoil sections. The maximum wing
thickness parallel to the plane of symmetry was 7.5-percent chord.
The maximum increment in maximum lift coefficient C due to
deflected trailing-edge flaps is less than 0.1 and 0.2 for the single
slotted and double slotted flaps, respectively.
The maximum values of CLmax obtained with either the single
slotted or double slotted flaps on the sweptback-wing - fuselage combina-
tion occur at flap deflection angles of from 100 to 250 lower than those
indicated by two-dimensional tests. The longitudinal stability is
slightly affected by the degree of flap deflection. The largest values
of CLmax obtained for configurations having stable pitching-moment
characteristics at maximum lift are 1.51 and 1.59 for the single and
double slotted flaps, respectively, in combination with extended leading-
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Mollenberg, Ernst F. & Spooner, Stanley H. Low-Speed Investigation of the Effects of Single Slotted and Double Slotted Flaps on a 47.7 Degree Sweptback-Wing: Fuselage Combination at a Reynolds Number of 6.0 X 10(Exp 6), report, September 10, 1951; (digital.library.unt.edu/ark:/67531/metadc58913/m1/2/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.