How does a parachute fall straight?

Answer 1

A conventional round parachute works by slowing rate of descent. The resistance of the air against the bell of the parachute provides an opposing force to the gravity pulling down. Such parachutes have a small opening at the top to let the air out slowly and provide stability. Without the hole the parachute tends to swing from side to side like a pendulum allowing air to escape from the upper edge which makes for a very unhappy person beneath. There is limited control on such a parachute with lines that can open small vents or collapse portions of the parachute.

The wing parachute operates completely differently. Forward motion allows air into slots at the front, blowing up the chute into a wing shape. Normal aerodynamic principles apply where air flows over the curved top surface faster than under the wing reducing pressure above the wing and providing lift. Such parachutes can climb as well as descend. Control lines provide equivalence with normal airplane wing controls such as aerilons but they work by flexing the wing as a bird, rather than moving small sections as on a fixed wing. By adjusting the lift ratios on different edges of the wing, turning, stalling, diving etc are achieved.

Answer 2

because god made it so