posted 08-09-2026 09:30 AM               

The door then trails the Orbiter and frisbees along behind it until it hits the runway and slides to a stop. It has been surprising to note how the flying door often defies gravity and flies formation with the Orbiter for much longer than predicted.

Initially the door was to be opened by a reusable actuator, but the weight of such a system was prohibitive. And when the concept of using the action of the pilot chute mortar was considered, it became apparent that the door would be pushed open so fast that arresting its angular velocity would be difficult. Thus the breakaway hinge and expendable door.