Flight 43 through 51: In April, 1948 a number of flights were made using .001" polyethylene balloons and fixed-leak ballast controls. Only four of these flights were recovered. The landing points of these are shown in Figure 15.
[figure]
Figure 15
Little is known positively about the floating levels since radiosonde data was not obtained on most flights, and no barographs were available. Three receiving stations at Alamogordo, Roswell and Carlsbad, New Mexico were used to position the balloon with radio direction-finding equipment. By assuming a floating level corresponding to the load, several flight patterns were derived. No aircraft tracking was provided to check these computed trajectories.
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