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National Advisory Committee for Aeronautics, Report - Interference of Wing and Fuselage from Tests of 28 Combinations in the NACA Variable Density Tunnel

Tests of 28 wing-fuselage combinations were made in
the variable-density wind tunnel as a part of the wing—
fuselage interference program being conducted therein and
in addition to the .4309 combinations previously reported in
N. A. C. A. Report No. 540. These tests practically
complete the study of combinations with a rectangular
fuselage and continue the study of combinations with a
round fuselage and a tapered wing.

An extensive wing-fuselage interference investigation
has been undertaken in the N. A. C. A. variable—density
wind tunnel as the second phase of a general program
designed to cover the problem of interference. A
discussion of this program is included in reference 1,
which presents the basic part of the wing-fuselage inter-
ference investigation and contains test results for 209
combinations.

The present paper is a continuation of reference 1
and presents the results for some 28 additional wing-
fuselage combinations that were indicated by the
program outlined therein. The present tests prac-
tically conclude the study of combinations with a rec-
tangular fuselage and continue the study of combina-
tions with a round fuselage and a tapered wing.
Future reports will cover further phases of the wing—
fuselage interference investigation.

The models employed for the combinations tested
herein were those used in reference 1; they are the
N. A. C. A. 0012 and the N. A. C. A. 4412 rectangular
wings, the tapered N. A. C. A. 0018—09 wing, the
round- and rectangular-section fuselages, the 9-cylinder
radial engine, and the engine cowling. Fillets were
carefully made up of plaster of paris as required.

The tests were of connected combinations only, 28
in all (see table V and figs. 8 to 11), and covered the
effect of vertical displacement of the airfoil from the
fuselage axis, k/c (see reference 1), the effect of fillets
on various wings in combinations with the rectangular
fuselage, and the effect of fillets and of a cowled engine
on round-fuselage, tapered-wing combinations for vari-
ous vertical wing positions.