Abstract
The wind-tunnel boundary interference on a V/STOL model is calculated in a test section with solid vertical and slotted horizontal walls. The method in the theory is the image method in addition to Fourier transforms with an equivalent homogeneous boundary condition on the slotted wall. The value of slot opening for zero interference is found as a function of model wake angle. The axial variation of the upwash interference suggests that certain variable slot widths in the stream direction will give zero upwash interference along the length of the test section.
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