Accession Number : AD0711921

Title :   EFFECT OF UNSYMMETRICAL NOSE-BLUNTNESS ON THE STABILITY DERIVATIVES OF A 10 DEGREE CONE AT MACH-14.

Descriptive Note : Final rept.,

Corporate Author : AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Walchner,Otto ; Sawyer,Frank M. ; Yelmgren,Kevin E.

Report Date : JUL 1970

Pagination or Media Count : 27

Abstract : In the analysis of the free flight motion of bodies of revolution, the tricyclic theory assumes that a small configurational asymmetry does not violate the rotational symmetry of the stability derivatives in pitch and yaw but does produce a non-zero trim angle. Tests at Mach 14 show that a small unsymmetric nose bluntness destroys the rotational symmetry of the stability derivatives of a slender cone at hypersonic Mach numbers and therefore severely violates the assumptions of the tricyclic theory. Restoring and damping derivatives in pitch and yaw are reported for a 10 deg cone with symmetric and unsymmetrically blunted noses. The effect of non-equal stability derivatives on the motion are shown for a simplified case. (Author)

Descriptors :   (*CONICAL BODIES, BLUNT BODIES), (*BLUNT BODIES, STABILITY), HYPERSONIC CHARACTERISTICS, NOSE CONES, PITCH(MOTION), YAW, SLENDER BODIES, DAMPING

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE