A STUDY OF THE EFFECT OF FLOATING-ELEMENT MISALIGNMENT ON SKIN-FRICTION- BALANCE ACCURACY
TEXAS UNIV AT AUSTIN DEFENSE RESEARCH LAB
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An experimental investigation was made of the effect of operating a floating-element-type skin friction balance with the element misaligned in the test surface. The misalignment consisted of mounting the element parallel to the test surface, but recessed below or projecting above the surface. A drive mechanism was constructed which permitted traversing the balance and its element through a range of approximately 0.003-in. of recess to 0.003-in. of projection. The effect of misalignment on balance output was determined in a continuousflow wind tunnel over a Mach Number range of 1.73 to 3.55, at several Reynolds Numbers. The results indicated that any degree of misalignment resulted in a change of balance output. This error in output was slightly larger for the case of a projecting element than for the recessed-element case. No consistent correlation between misalignment error and either Mach Number or Reynolds Number was found.