parachute vent

parachute vent

An aperture on top of the parachute or left blank by a gore to ensure stability in the descent. A vent also can be opened on the back of a round canopy to allow air to escape and thus propel the parachute forward approximately 3 to 5 miles per hour. This allows a small amount of steerability in a round canopy. See parachute.
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They are made of a large number of gores, slices of the canopy held between radial reinforcement cables running from the parachute vent at the top down to the skirt.
After passengers climb out of the basket, the pilot opens the parachute vent.