Fli£ts 68 tilrouyt: 72: In July, 1948 this series ot flights was Dade 1ritbout
b&i at controls to determine the natural buoyancy of the General Mills, Inc.
20-foot .ool" polyethylene balloons. Of five such flights, only two good
~arograJ;b recorda were obtained, one daytime flight (70) and one night flight
(71). In both oases a nearly constant level was maintained for about four
hours at the highest altitude reached. ·
On the barogram of Flight 70 {Figure 25) a section of arrested descent may
be noticed, preceded and followed by a nearly constant tall. The cause of
this step is not apparent, although a check has been made of the atm.oltPheric
structure of that day.
NYU BALLOON PROJECT FLIGHT 70
Showing 20' General Mills ·Balloon
Performon1:e When No Ballost Was
Dropped
RELtAS£0 AT HOI.LOIIIAJI Ml,ll.lll- ~ULY t.l1141
OISI IIIST- RICOVEIIIO AT KENT, TEXAS
Figure 25
On Flight 71 marked oscillations are seen at the fleeting level and alao
during the descent portion of the barogram (Figure 26). Clearly these must
represent atmospheric motions since no controls of any sort were in use.
There is no reason to believe that rapid changes in superheat occured, since
the floating level was far above the cloud level. Also the flight was made
at night and no sunshine was encountered.
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NYU BALLOON PROJECT FLIGHT 71
Barograph Record Of GM. 20 Ft. Ploshc Balloon Show1ng
Balloon Performance When No Bollost Wos Dropped.
RELEASED AT ALAiiiOGOIIDO lUI., 20•1 IIST•S JULY, 1141
R£COYEIIED AT VALENTINE TEXAS, 10 ~ULY, 1!141
UTIMATIO OIIRATIOIII 10 HOURI
Figure 26