AFTER OUR DISCUSSION OF YESTERDAY I THOUGHT THE FOLLOWING CALCULATIONS MIGHT PROVE USEFUL:

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03642A001300030082-4
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: May 2, 2012
• Sequence Number: 82
• Publication Date: November 13, 1959
• Content Type: LETTER

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Declassified in Part -Sanitized Copy Approved for Release 2012/05/02 :CIA-RDP78-03642A001300030082-4
C0~! ~I DE~TIA~ '~ ~?~ 1~`'
alts: oar disaarsion o! ,rester~Is,- z thought the tolll~rietg ~,clulatiotur
~~~ pzo+te ~~
A. system regairarnts " sphere snd " sphsre to SQ,~ last
in. s. l.~ rata! of rise 1000 rt/msn
B. li!'trri ballet si:~! daltatrm~ine-ticez
~ ? ~l ~ ~? x exp. lsator
t~harx'!t V is volume of litttr balloon
it is the ttei~ht of all components e~ept the lifter balloon,
P.~ is used to -aid the tre3h oft' and to orient the loed tssin
~-
?r1~ is tfiua freight o* tha lit~Ler balloon. This can be expressed
in t+o~s~~t>! t~ volt~e, hsreass'umed to bs .006V !or 1 mi.l filar
.0't0 is lilt per cubic loot of hydrogen gas.
The expltnsion tutor is from the stan8ourd atmoalphes'~e f for
~o thoase-ad legit it is 6.~g
aubstittttion in the lords +O~+o'Y+es f
_ Y w g .t~'i~ x~
.0'~OY - ?0393Y w 13.1
v. ~'S st3
e live loot diameire~ c~riinder 1rl.th a volume a! ~3 !t 3 0l course has
a longth -"t'x'- x~~) L s ~
L?4~gx~? 21.6 feet ~
the might o.! jthe litte,Y balloon is .Otl6Q1i or .006 x $$g ,s Y.SS i~~
total mlight is R ~ 2.gg ? Z-.$5
tree tilt at li~i is . ~~~ ibs .
gross lilt they is g.fl0$ lbs. noc ~_~ B~tE ~ v nr
.~L~~-
COr~C~i'~~iE~.~
dRlG CQktP .L!~ 4P! _. ~P~ __= _=
ails SlASS ?l6t~ ~- At1- d!.'11 ~.~. _,_ ;
Jt'St ___.~~ ilEl(t iEl- . lntn ~tt1M~ MA 1~~ I
?~ ~Y~~~V~~il
Declassified in Part -Sanitized Copy Approved for Release 2012/05/02 :CIA-RDP78-03642A001300030082-4
 Declassified in Part -Sanitized Copy Approved for Release 2012/05/02 :CIA-RDP78-03642A001300030082-4
Using 8 * Pr t * 1 nail
2t r s radius o! ayiindor in inches ? 30"
e * toot material stress + 8Q00 psi
P ~ the allcsWabls pressure in pounds/in`
P . 2ts ^ 2x.001 x $000
r ~..~.-..~~,...~
s $~15 psi
* 31.8 millibars
giving a safety lsQtor o! almost ~ !or the 8~0 psi figure which itself
contains a safety !actor o! 1.$ obviowly the balloon lron't burst at
IO~r lyre lilts ~ at 20~i !or thatmatter.
Ualortwcately the figures !or the bslloon v+eight in terms o! tlse volume
(.006V) may not be swat izut it is close, axed I xevise my estiaeate o! the
filter balloon length saso~dingly.
C~i~f=f~ENTI~L
Declassified in Part -Sanitized Copy Approved for Release 2012/05/02 :CIA-RDP78-03642A001300030082-4