1、/ . RESEARCH MEMORANDUM NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS “ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-By Jules B. Doh, Jr. The results of a wlnd”tunne1 investigation of the 1ow”epeed aerodynamic charactsristice of two semfspm horizont
2、al tails having unswept and 35O aweptGback plan forms are presented. The two models had an aspect ratio of 4.5, taper ratio of 0.5, and an WA cubic foot P absolute viecosity, slugs per foot-second v S c velooity of air, feet per second area of semiepan horizontal tail, equare feet % area of 8emiepa.
3、n elevator aft of hinge line, equare feet In addition, the following epbol %-hinge bracket. The pres8ure orifices at 91 percent epm were outboard of ths elevator hinge bracket. The tip shapes were formed by rotating the tip airfoil section parallel to the undisturbed air stream about a line inboard
4、of the tip, a distance equd to the maximum tip ordinate. L Photographs showing the models mounted in the wind tunnel are given in figures 2 and 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA RM Xo. A8Bll 5 The models w8re mounted on a turntab
5、le Plush with tihe floor of me of the Aums 7- by 1Moot wind tunnels. (See f ige. 2 and 3.1 The teste were conducted with a dpmic pressure of pounds per square foot, correegmding to a Reynolde nlmiber of 3.0 X LOe. For those teste with leadin“ rouness, etandard rougbnees wae applied in the manner dmc
6、rlbed in reference 2. All coefficients and the angle of attack ham been corrected for the effeote of the- tunnel wall8 by methods to those of reference 3. phe corrections listed below were added to -tihe data for both the un8wept and the swep-aok mdels: the change in Ch w ha 3.0 x /06 Provided by IH
7、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-20 -20 -/6 -12 -8 -4 04 8 /2 16 20 Angle of ultuck, a, deg /b) Hinge-momenf coefficient figure. 4 - continued Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-fcl Pitc
8、hing-moment coefficient Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-22 WA RM No. A8Bll Elevufor deflection I Be, deg Figwe 5.- Vanufim of hinge-moment coefficienf with elevofor deflection for various ungles of ottack of the unswepf foil. Aspect r
9、ofio, 4.5; 30 x 10: . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-(0) 4 = Go 6 -4.“ Figufe6.- Voriufion of pressure coefficient across e/evof or-nose seu/ wifh angle of offock of fhe unswepf fail. Aspect rotio, 4.5; R# 3.0 x IO? Provided by IHSNo
10、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-24 .P 0 -2 -.4 -.4 -.6 ? -LO Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-mACA RM No. AI$= .8 .6 -.8 -L2 -4 0 4 8 /2 /6 20 24 28 32 Angle of uttuck, a# deg (a/ Lift c
11、oefficient Figure 7- compur/sm of the /iff unci hinge mmenf coef- ficienfs of the smooth and raugh unswept tui/. Aspect ratio, 4.5; RI 3.0 x -10 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-26 HACA R?4 No. A8BU (b) Hingemoment coefficienf Figure
12、. 7 -conc/uded Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1.4 -.6 -.8 Angle of uffackJ as deg (u) Lift coef ficienf. Figure 8.- Comparison of fhe /iff and hinge -momen f coefficienfs wifh and wifhouf elevofcw sea/ on fhe unswept toil. Aspect fot
13、io, 4.5; RJ 3.0 x 10. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-28 (b) Hingemoment coefficient. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
