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.
(Those aren't the only hazards: Note the beehives near this landing site.) After passengers climb out of the basket, the pilot opens the parachute vent.