“filmed”36 pages
- p. 17 …Inevitably these stories coming from the
desert have spawned countless articles, books, films, and even museums…
- p. 106 …Prin~s •••••••• 403
Ground Negatives ••••••••• 285
Aerial Roll Film ••••••••• 741 feet
~5 mm Film ••••••••••••••• 454 feet
- p. 227 PROFESSOR MOORE - 6/8/94 11
balloons out of a Goodyear film called pliofilm. It was…
- p. 459 …The development of controls and films for balloon material
proceeded concurrently, but the choice of a…
- p. 460 …an extruded film of plastic was found to
be superior to fabrics such as silk or…
- p. 461 …From this data polyethylene and saran appear to be the most
sui table films.
Table l…
- p. 462 …It II
I
Table 2
Plastic Balloons
!Film Type, Thickness; Special
lDiameter, Shape ; Features
Unit
Cost…
- p. 463 …In all of these, film is .001" polyethylene, butt -welded with
fiber tape laid along the…
- p. 487 …For this reason a transparent film has a definite advantage over a
reflecting fabric. For example…
- p. 490 …leakage through small holes in the fabric or film;
solution, migration and evaporation th~ugh fabric…
- p. 495 …1s the pressure difference across the film
A = area of the opening
dCJ = density of the…
- p. 496 (2) Solution, Migration and Evaporation through Film
A very sli~t amount of lift is lost…
- p. 497 …be computed from the equation:
(1) ~p=~ for failure of the fabric or film,
where:
-47-
- p. 498 …S J'QOX
where Smax=maximum strees in tension)
thickness of fabric or film (inJ
balloon…
- p. 502 …be
transferred to the balloon fabric or film. In other words,
there must be a pressure…
- p. 505 …In order to make most efficient
use .of weight, the balloon film should be thin. As…
- p. 610 …High transparency to heat redie.tion
Table I is a qualitative-characteristics catalog of the film…
- p. 612 …Table II
Film type, thickness, Special Unit Delivered
Company diameter, shaf! Features Cost to date
H…
- p. 620 …in the field of shrouded or ooated
films.
B. Altitude Controls
Given a balloon capable of…
- p. 652 …Applying this equation to a polyethylene film, such as used in the
General :Mills 20-foot…
- p. 660 …With the thin polyethylene film of' the General Mills' balloons,
such a wind force causes the…
- p. 729 …Flight Hourly Weather
Train Sketch in Folder Films Sent Out
----------------------- --------List ~light .Records in Folder:
Remarks…
- p. 737 …Another film in-
vestigated is Saran, which has ten times the tensile
strength of polyethylene-three…
- p. 764 …do not make
as a possible )lastic film only molding
fi~ to be used for ~owder…
- p. 765 …thickness .004 and .006
polyethylene film would 15 18 11 flat width.
be extremely difficult The…
- p. 768 …Requesting that poly-
ethylene film that had
been shipped to them
from Plc~~ Corp. be
returned…
- p. 769 …C~irming telephone Film shipped.
conversetion in which Quotation SU?Plieci.
authori3ation we.s ~iven
to…
- p. 770 …with butyl rubber an::l
from nylon film.
Identical letter as
above request to Air
Cruisers…
- p. 775 …4• The cont~cting of plastic film f~bricator~ to obt~in scver~l
sources of…
- p. 778 …Balloons
Balloon manufacturers and fabricators of plastic films were
contacted to locate a suitable balloon material…
- p. 780 …2 each made frotjl ?olyethylene PM-1 film .004 11 thick
2 ec:.ch made from…
- p. 789 …Future Work
General Mills is making large balloons from lightweight films
that would meet our specifications…
- p. 794 …to ba.//oon at .30°
~efow Pa/loot>'s e1ua tor.
/18/unes of flat film…
- p. 893 …For example,
the film is so easily injured that it is not safe to lay
a…
- p. 920 …A very thin, tine-grained carbon
film should be deposited on the aluminum foil.
The best…
- p. 941 …Flight Hourly Weather
Train Sketoh L~ Folder Films Sent 0Jt
-------------------------- -------------List Flight Reoords in Folder:
Remarks…
various cluster arrangements. None of these have been too satisfactory
but further investigationwill be made in the field of shrouded or ooated
films.
B. Altitude Controls
Given a balloon capable of caJTying the instruments to a desired
altitude (the theory and computations involved are discussed in Section 3),
there remains the problem of maintaining the cell at a constant level. The
buoyancy of a gas-filled cell will decrease as the cas leaks or diffuses
through the balloon wall. To hold an absolutely om.stant altitude, the
volume of lifting gas entrapped must be maintained in an atmosphere of
unvarying horizontal density, with no change in the total weight supported
by the balloon and with no fluctuations of the temperature of the gas with
respect to the air. The best approximation to these conditions may possibly
be achieved through the use of liquified hydrogen, which would be permitted
to evaporate at a rate in excess of gas leakage. The weight of equipment
required to control this evaporation rate appears to be prohibitive. Liquid
hydrogen, also, is not safe to handle.
Two practical methods of keeping a balloon at nominally constant
altitude have been devised, both using the liquid ballast dropping technique.
(Solid ballast, such as sand, does not flow well and is liable to absorb
moisture whiohwill freeze at the temperatures experienced at high altitudes.
Although a few preliminary flights were made with desiccated sand, a highly
refined water-free kerosene-type petroleum product,campass fluid,was found
to be more satisfactory) ,
In the simpler control system, ballast is dropped at a pre-determined
rate, aimed to slightly exceed the loss of lift of the balloon du~ to leakage
and diffusion. If this method is successfully used, the balloon stays full
because the remaining gas in the balloon has less load to support; the ref ore,
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