Pressure measurements were made on the core vehicle in theudstrap-on interference region of a 1/100 scale PSLV configuration at supersonic Mach numbers of 2.1, 2.5 and 3.0 and incidences of 0 and +/- 5 degree. The test Reynolds number varied from 33.8 to 46.9 millions per meter. Pressure coefficients are compared with those obtained in 1.2M tunnel on a 1/40 scale PSLV configuration at a free stream Mach number of 2.5. The pressure variations are in agreement except in a short region where the pressure coefficients obtained in 0.3M tunnel are lower compared to those of 1.2M tunnel. This discrepancy could be due to the presence of link in the strap-on region and also due to viscous effects arising out of difference in Reynolds number.
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