Summary of results of a wind-tunnel investigation of nine related horizontal tails Page: 3 of 106

                                
NACA TN 34Q7

and to provide experimental results which could be used to determine
the accuracy of theoretical procedures for estimating the lift and
hinge-moment parameters. References 1, 2, and 3 have presented
detailed results of tests, conducted in the Ames 7- by 10-foot wind
tunnels and the Ames 12-foot pressure wind tunnel, of a series of
horizontal-tail models having aspect ratios from 2 to 6 and either
having the hinge line normal to the plane of symmetry or having 350
or 450 of sweepback of the quarter-chord line. A comparison of the
lift and hinge-moment parameters evaluated from theory with those
obtained experimentally was presented in reference 4.
The purposes of the present report are: to combine the basic
design information available in references 1, 2, and 3; to summarize
the experimental and the theoretical variations of the lift and hinge-
moment parameters with aspect ratio and sweepback at a low Mach number;
and to show the effects of changes of the Mach number on these para-
meters for three of the models.
NOTATION
Coefficients
h     elevator hinge-poment coefficient (elevator hinge moment)
Ce 12qMA
Che   section hinge-moment coefficient (section hinge moment)
q(ce')
CL    lift coefficient (lift)
qS
c3    section lift coefficient (section lift)
Qc
AP    pressure coefficient across the elevator nose seal
pressure below seal - pressure above seal
free-stream dynamic pressure