Test 172: McDonnell Variable Sweep

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Following tests of the British Swallow bomber, variable-sweep wing configuration (see Test 159) with an outboard wing sweep pivot location, an extensive variable-sweep wing research program was initiated by USAF (Tactical Air Command)/Industry/NASA teams to investigate variable-sweep wing fighters (See Tests 168, 172, 174, 175, and 179). Configurations that utilized outboard wing pivot locations were studied in an effort to minimize the longitudinal stability problems associated with the shift in airplane aerodynamic center location as the wings were swept aft. The test models were generally referred to as "TAC" (Tactical AirCraft) models and were tested in multiple facilities at Langley; this is in contrast to company nomenclature that referred to many of them as TFX (Tactical Fighter, Experimental) configurations. This successful research program eventually led to the USAF F-111 and US Navy F-14 configurations.

Test 172 was conducted on a McDonnell Variable Sweep Fighter during two tunnel entries in late 1960.

10/24/1960 to 10/29/1960 - McDonnell Variable Sweep

L-60-6859.jpgL-60-6860 McDonnell Variable Sweep DT-7 Model 1960L-60-6861_McDonnell Variable Sweep BW-5L-60-6862_McDonnell Variable Sweep DT-71960 McDonnell TFX-3L-60-6864_McDonnell Variable Sweep BW-5

11/22/1960 to 12/7/1960 - McDonnell TAC Model

1960 McDonnell Sweep BW-51960 McDonnell Sweep BW-51960 McDonnell Sweep BW-51960 McDonnell Sweep BW-5
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