Why the parachute must wait for some time before opening the switch?
Not all of the parachutes are waiting for some time to open. This depends mainly on the flight altitude of the aircraft when parachuting. In general, the parachute is 500-1000 meters away from the ground when the opening is the most secure. If opened too early, it will not be able to control the landing to a predetermined location if it falls into the water or on the wire ...
Not necessarily, is needed as needed.
Pattern skydiving to finish modeling to open the switch.
If the fighter pilots evacuate parachute must be quick to open the switch, of course this is automatic.
