“Gross”26 pages
- p. 143 …Robert Gross ar.d 't!r. Jlaher of Lockheed
11~ 55 A.'.!. Gen. Sam Anderson
12…
- p. 481 …Balloon Volume x Gas Lift
Gross Load ·
It may be noted from this equation that a…
- p. 482 …Balloon Volume x 24.4
Gross Load
K
=-w
K _ 08.o475Z
In turn, w-in…
- p. 483 …free lift in pounds
and G is gross lift in pounds.
Although this equation was derived…
- p. 488 …By equation
{10), with a gross load of 52 kg., the unbalance caused by loss
of…
- p. 500 …or a gross
buoyancy of 450 lb. • the maximum allowable infle.tion of a 30'
diameter…
- p. 569 …accelerating
force equal to 5% of the gross load (52 kg) was acting to bring the…
- p. 643 …000 feet.
In one step, this becomes:
Gross Lift/Balloon = (Balloon Volume) x (Difference in molecular…
- p. 650 (Approximate)
where G • gross load
A chart, Figure 24, has beendrawn up, based on this equation…
- p. 652 …G = loss of lift
G =gross load (balloon weight plus
equipment load)
AT : mean temperature difference…
- p. 653 …not including balloon or its integral
parts.
Gross load: Load on the gas at release (Balloon…
- p. 726 …Ballast • • .. • • '" •
Total Equipment l~eight. • • • • '
Gross Load • • ' • • • •
{56)
- p. 727 …Balloon volwne x gas litt/mol
gross load
cu. ft.
-----------------NAximum Altitude • • • ft, m.s.l…
- p. 741 …altitude deter-
mined by the displacement and gross load.
7. Control systems
Two systems of control…
- p. 777 …By adjusting th~ gross load to be
supported by the gas to equal the total lift…
- p. 787 …Computations
A chart showi~ the relation between altitude, gross lift, and
balloon size has been found…
- p. 883 …The gross load reported should be
accurate to the nearest 200 grams. The amount of lifting…
- p. 885 …A L L 0 0 N
7300 ,, GRoss LoAD
Fl G. 17
NYU BALLOON pROJECT I…
- p. 887 …bubble length and resultant inflated volume,
using gross lift as an expression of volume. It will…
- p. 889 …in Appendix II summarizes the relationship between gross
load and floating level for balloons of several…
- p. 925 …A can of sand
is made to weigh the same amount as the required gross lift…
- p. 933 …the balloon with the equipment
load attached.
Gross Lift: Lift of all of the gas in…
- p. 938 …description.______________
Drag chute ----------------------------
Banner description --------------- ----------
Ballast assembly - description -----------~--
Ballast • • • • • •
Total Equipment i'ieight • • ' • • • • • •
Gross Load • • • • • • • • • • •
-86-
- p. 939 …wnitin_,g________ grams
Actual balloon lift • • • • • • • • ". . .•
II
AActunl gross lift (Balloon lift & balloon wt.) •
Number Helium…
- p. 943 …Gross Lift vs. Bubble Length • • • • • • .107
Graph 3: Buoyancy vs. Altitude • • • • • • • • • .108
Graph 4: Gross Load…
- p. 955 …BALLOOO DA 'fA
General Mills Actual Balloon Estimated Gross Altitude
~ominal Diiameter Volwne Weight Load Limit…
0 = the acceleration of gravity (ft.jsec.2)
Aa = area .of the opening (ft. 2)
h : head of fluid causing flow (ft.)
s1nce h= l44~P , we have:
dg
(12) llp = dg ( I dV )2
psi
288g cd Ao. dt
where dg is density of the lifting gas (lb./ft.3).
From equation (7) we have:
dV de
crr='dt v
27800
therefore:
(13) Ap = dg ( I
2880 CdAa
d! v )2
dt. 27800 psi
Comparing equations (10) and 0.3) we see the.t if the equations are
equal:
I =
28ea c~
14.7
2
1333 dao
If' we let Cd =.975 , a reasonable value for the relatively
low velocity flQw of' gas through the appendix, we have:
14·7 = 114.8 x lo-• ft·sec 2 t•n2
13331 d00
Therefore, the equations (10) and (13) are equal and inter-
changeable.
It may be noted from equations (10) and (13) that for any given
balloon, appendix area and balloon volume are fixed, and the
related veriables are lifting gas density, rate of rise, and
allowable b~ok pressure. For any given allowable back pressure
greater rates of rise are allowable at higher altitudes (where
dg is lower).
Or.oe e floating altitude has been decided upon or it has been
decided to carry e given load as part of the balloon system, we
can find a maxireum allowable rate of rise. We must consider
-54-