A demiseable momentum exchange system includes a base and a flywheel
rotatably supported on the base. The flywheel includes a web portion
defining a plurality of web openings and a rim portion. The momentum
exchange system further includes a motor for driving the flywheel and a
cover for engaging the base to substantially enclose the flywheel. The
system may also include components having a melting temperature below
1500 degrees Celsius. The momentum exchange system is configured to
demise on reentry.