Document e193LMLa5vmvNdRGGRgD8qzDG

PLAINTIFF'S EXHIBIT 3906 6 iV 24M k O 62/ MEMORANDUM In Reply to. Subject. Dafe_ 3/14/60 fwm PBI K0PPEB8* PAMSL3 WITH V-3 SKINS * CORNELL Kp# l) ITT On I4aroh 10, the writar witnasaad tha tasting of tha Koppera* 4f x 6* panel* with 0*100* 7*3 skins* There wore three 3* thick panels and three 2" thick patois with eoros of "Dylite* oxpiuMtod polystyrene* Thoao patois wars subjected to axial compression loads according to ASTM 72*55 procedure on a universal tooting machine at Comoll University* Tho 2* thick patois had a section of odgo damagej however, this did tot offset tholr performance. Also, one of those panels had a 1* long slash in one of thS skins* The report covering this work is expected from Cornell in about one week* Two of the 3* thick panels failed at 7,000# total load over the 4* dimension* The third failed at 9,000#* All failures were due to compression buckling of the skills* The 2* thick panels failed in the 4,000-5,000# range* The results will now have to be compared with Toppers* data for other skin materials in order to determine how satis factory tho 7*3 skins art structurally* HWloon/rp