cd : [REos=) Project 11.2 = Sampling - H. F. Plank (P. F. Moore) EQUIPMENT Seven aircraft equipped for cloud sampling as described in the VIPER 2 Report were used on this mission: "A" flight, Tiger Red One (F-84); "B" flight, Tiger Red Two (F-84); "C" flight, Tiger White One and Two (2-F~84'!3); "D" flight, Tiger Blue One and Two (2-F-84's); and control aircraft, Cassidy (B-57). i WEATHER 2 The cloud cover was quite extensive at low levels with occasional cumulus reaching up to 25,000 feet, but so positioned that none of them threatened to engulf the small bomb cloud, Wind structure was on the whole favorable with light velocities compensating for the directional changes in wind of about 10 degrees for each 2,000 feet change in altitude, CLOUD DESCRIPTION The bomb went off under the edge of a small cumlus cloud and the banb cloud carried quite a bit of natural cloud material up with it so that in the early stages there was high turbulence within the cloud and practically no color, After about 20 minutes of this slow churning rise the bomb cloud stablized with the top at 21,000 feet, about 8,000 feet higher than predicted on the original yield prediction, The cloud then spread out widely under the influence of the variable winds and the fleecy color disappeared completely, leaving only / COPIED/DOE LANL ROH - 25 - }.