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Balloon Flying Menu > Introduction to Ballooning >
Balloon Components > Envelope
The envelope is the fabric portion of the
balloon containing the hot air and is usually made of nylon.
The deflation port is located at the top of the envelope and
allows for the controlled release of hot air. It is covered
by the deflation panel sometimes called a top cap, parachute
top, or springtop (refer to figures 1-2, 1-3, and 1-4). In a
balloon with a parachute top, partial opening of the parachute
valve is the normal way to cool the balloon. Balloons with other
types of deflation panels may have a cooling vent in the side
or the top.
FIGURE 1-1.—Basic Balloon Terms.
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