20' dia. G.M. .001" polyethylene balloon
with incendiary patch on equator
for rapid descent below 20,000' (460 mb)
2" steel ring for launching lines
T69, Rawinsonde (397 mc), Heavy duty
battery pack, standard modulator,
no ventilating duct, white temperature element, 25 ordinate humidity.
Heavily reinforced baroswitch fires
on descent to 460 mb. Uses 2 ea. 45 volt
batteries in parallel. Black box, loosely
covered with plastic sheeting.
Hillman's transmitter w/pressure from
standard modulator. 3.135 MC (149'
antenna through rings on 160 foot para-
chute shroud). Held taut by 6 oz. lead
wt. at bottom.
Estimated length overall: 257'
T-49-74.5 MC Radiosonde, end fed
antenna, standard modulator, no venti-
lating duct, white temperature element,
25 ordinate humidity, squib in ballast valve
fired by B power supply of radiosonde.
HEAVY DUTY BATTERY PACK
Ballast reservoir with Kollmann
ballast valve plus fixed rate
leak from adjustable needle valve
set to overcompensate diffusion by 10%
Minimum pressure switch actuates
ballast valve when balloon descends
15 mb from maximum pressure, 2 each
used in parallel.
FIG. 46
NYU BALLOON PROJECT
FLIGHT 12
Date 8-5-47
ED-48-43