CHAPTER 4 DISCUSSION All experiment objectives were partially met in spite of unexpected deviation from the predicted yields of Shots 1 and 3. Shot 1 yield was much larger than expected which resulted in heavy damage to stands on William and Victor Islands and light damage to a portion of Uncle Island stand. The yield of Shot 3, for which the experiment was designed, was much lower than predicted; however, the entire Uncle Island stand was heavily damaged. This heavy damage overlapred the Shot 1 light damage region on the upper end of Uncle Island. Negligible deflection of snubber trees on Victor and William Islands for Shot 3 placed these islands in a no-damage region. Thus two graded series of damage were secured--one from a high yield weapon, and one from a medium yield weapon. Measured peak static overpressure values for Shot 3 through the mixed palm-broadleaf Uncle Island stand (Fig. 4.1) are in general within -5 and +15 per cent of curve values prepared from free field measurements adjacent to the stand. Results of these measurements taken at stations over a distarce of 2000 ft into the stand do not indicate any peak static overpressure attenuation. For Shot 3, the three dynamic pressure gages, one outside and cne inside Uncle Island tree stand and one outside the stand on Victor Island, recorded peak dynamic pressures respectively 1.9, 5.6, and 33 times greater than values calculated from corresponding peax static overpressure measurements. The single free field measurement along the blast line, at 6500 [t, adjacent to the Uncle Island stand was greater than the calculated vaiue by 10 ver cent. In light of these unreascn- ably high peak dynamic pressure measurements, both outside and inside Uncle Island stand, the amount of attenuation of the peak dynamic pressure in an extensive tree stard remains an open question. Isodamage curves presented in Fig. 4.2 are_gne of a set of curves prepared for inclusion in Capabilities Handtcok->’ and are the resuits of theoretica! anelysis of dynamic breakage due to shock ioading. 1/7 e AFSWP, Capatilities of A:cemie Weapons, TM 23-200. 40 SECRET — RESTRICTED DATA The