Keywords: blackandwhite monochrome white background text illustration black and white (A-21506): Since they used interchangeable test sections, both 1 x 3-foot supersonic tunnels employed the sting arrangement shown here. Note that the strut is attached to dual rings around the observation windows that rotate, turned by a worm-gear drive, to set the desired pitch. (A-21506): Since they used interchangeable test sections, both 1 x 3-foot supersonic tunnels employed the sting arrangement shown here. Note that the strut is attached to dual rings around the observation windows that rotate, turned by a worm-gear drive, to set the desired pitch. |