completely damped out at the time of the. reflected shock arrival, 4.44 seconds later. The timing was such that the response to the reflected ‘shock was in phase with the vicrations produced by the initial shock, thereby producing hicher loads for the second shock than the first. Although this coupling effect caused only a small per cent increase in the total load measured, there are conditions where the effect colild be consideratiy creater. The blast loads measured on the b-47 aircraft and presented in -, Tete this report substantiate the theoretical prediction that for straight- over wearcn delivery, thermal, nct tlast, criteria are controlling. ,. t m * : ow ’ ° ~ @ Se} oO kL. \!