CHAPTER 3 RESULTS 3.1 GENERAL The unexpectedly large yield of Shot 1 incident from the opposite direction of Shot 3 caused heavy damage to the tree stands on William and Victor Islands, end light damage tc the upper portion of the stand on Uncle Island. Shot 2, coming from the same direction as Shot 1, caused no additional damage. Shot 1 proved to be rather fortuitous, especially in light of the unexpectedly low yield of Shot 3, for which heavy damage extended to just beyond the light damage region of Shot 1. Thus, two sets of graded general damage data were secured instead of one, namely, data on camage from a high yield weapon cf long positive phase duration time, and damage from a medium yield weapon with shorter vositive phase duration time. 3.2 OVERPRESSURE AND POSITIVE PHASE DURATION 3.2.1 Shot 1 Ground ranges and estimates of overpressures and positive phase duration for Shot 1 are given in Table 3.1. Ground ranges were calcu- lated from established coordinates, and are distances to BRL gages used for reference points. Free fieid overpresgyre and positive phase duration time data were furnished by Program 1 and were used in ccrrelating damage with distance of natural tree stands. 3.2.2 Shet 3 duration 1 gives ground ranges and overpressure and pesitive phase stimates usec in reducing test data. Peak static over- ressure records from Shot 3 wére satisfactory as seneraliy one gage in each twin installation was operative. Positive phase duration time cate T i fSummary Rerort of the Commander Task Unit 13, Operation CASTLE Programs i-3, »f-932. SECRET--Res-cricted Data. <6 SECKET- RESTRICTED DATA