DIY History | Transcribe | Van Allen Papers | James A. Van Allen journal, December 1954-October 1955

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James A. Van Allen journal, December 1954-October 1955

Page 46

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Therefore, Per "H" cylinder of Helium:
at 1800 p.s.i. : 12.0 lbs net lift.
at 2260 p.s.i. : 15.0 lbs. net lift.
[outlined in red ink]
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To check General Mills:
   33.3 "H" cylinders (2260)=500 lbs. net lift.

Weight of 551A           -  69.5 lbs.
Total Equip.                   225.5
                               ¯¯¯¯¯¯¯¯¯¯¯¯¯
                                        295
Free lift                               40
                               ¯¯¯¯¯¯¯¯¯¯¯¯
Gross lift needed             335 lbs.
                             ==============
Evidently some margin of safety (or perhaps usual pressure is 1800 p.s.i.) (400 lbs. net lift per cylinder).

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Apparently wise to figure ~12 lbs. lift per cylinder.
17 April 1955
[This sentence circled and dated in red ink] 
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------------------------------------------ ------------------------------------------ Therefore, Per "H" cylinder of Helium: at 1800 p.s.i. : 12.0 lbs net lift. at 2260 p.s.i. : 15.0 lbs. net lift. [outlined in red ink] ----------------------------------------------- ----------------------------------------------- To check General Mills: 33.3 "H" cylinders (2260)=500 lbs. net lift. Weight of 551A - 69.5 lbs. Total Equip. 225.5 ¯¯¯¯¯¯¯¯¯¯¯¯¯ 295 Free lift 40 ¯¯¯¯¯¯¯¯¯¯¯¯ Gross lift needed 335 lbs. ============== Evidently some margin of safety (or perhaps usual pressure is 1800 p.s.i.) (400 lbs. net lift per cylinder). ----------------------------------------------------------------- ------------------------------------------------------------------ Apparently wise to figure ~12 lbs. lift per cylinder. 17 April 1955 [This sentence circled and dated in red ink] ----------------------------------------------------------------- -----------------------------------------------------------------