This interesting modern variation of a traction trebuchet uses multiple elastic bungee cords in tension for motive force. From the United States Patent Abstract: 

 Human Free Flight Catapult 

 An amusement ride for catapulting a human rider, enclosed within a capsule, into the air in much the same fashion as ancient armies would hurl large boulders over the walls of castles. The catapult provides many of the sensations and thrills encountered by fighter pilots launching from the decks of aircraft carriers without the requirement for flight training or the associated dangers. 

When an acceptable elevation is reached, the rider is separated from the capsule and gently brought back to earth using an automatically deploying parachute or similar device.
 

How to Build a Catapult  >> Catapult and Trebuchet Links and Resources >>  Human Catapult

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