Wind Tunnel Measurement of Airborne Towed Cable Drag Coefficients
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Four tow cables used in the AMRL Long Line Loiter program were tested to determine their drag characteristics. Each cable was tested in angle of attack range alpha 15 degrees - 90 degrees and Reynolds number range Rn 12, 000-54,000. Tests were performed in the AFIT five-foot subsonic wind tunnel. The cables were of two types 1 two circular, hollow-woven polypropylene lines, for which Cd vs. Rn was generally concave up for high alpha and nearly linear for the low alpha. Maximum Cd at alpha 90 degrees was near 1.2 the critical Rn was approximately 35,000. 2 two flat tc 12 hollow-woven nylon lines for which Cd vs. Rn was concave down for high alpha and nearly linear for low alpha. Maximum Cd at alpha 90 degrees was near 1.0 no critical Reynolds number was reached during flat cable testing.