The ballute (a portmanteau of balloon and parachute) is a parachute-like braking device optimized for use at high altitudes and supersonic velocities. Invented by Goodyear in 1958, the original ballute was a cone-shaped balloon with a toroidal burble fence fitted around its widest point. A burble fence is an inflated structure intended to ensure flow separation. This stabilizes the ballute as it decelerates through different flow regimes (from supersonic to subsonic). The ballute is either inflated by a gas generator or by air forced into the structure by ram air inlets. Ballutes have also been proposed in stacked toroidal and tension cone form factors, in addition to the more standard isotensoid ballute.

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