The balloon that supported the Stargazer capsule was a 280-foot diameter sphere of Mylar film; however, at launch only a comparatively small bubble of helium gas occupied the top of the balloon with the remainder of the balloon envelope dangling beneath. As the balloon rose, the gas expanded, filling the balloon until at maximum altitude, it was completely filled and reshaped the envelope into a sphere. The gondola was supported below the balloon on a cable giving a total height at takeoff of approximately 400 feet.
Related category MANNED SPACEFLIGHT
Source: National Museum of the USAF
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