From Worms Knowledge Base
Chute flare is a name given to Silkworm's ability to automatically reselect the Parachute; the chute "flares up" immediately after each use. Later versions of Silkworm also added the ability to jump off a tall cliff and appear to fall the entire way; this illusion was accomplished by repeatedly dismounting the chute 1 frame after its automatic activation, avoiding the critical falling velocity so that control was never lost.
One trick involves rapid toggling the parachute on and off during a fall. A good name for this would be "Chute flutter". Both Silkworm and Constipated Silkworm are capable of this, though Silkworm did a better job of it by directly inserting messages in the input stream.