Mid-air retrieval

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A helicopter with a long hook can catch a parachuting object in mid-air, as seen here in a practice run for the planned retrieval of Genesis. Genesis retrieval.jpg
A helicopter with a long hook can catch a parachuting object in mid-air, as seen here in a practice run for the planned retrieval of Genesis.

Mid-air retrieval is a technique used in atmospheric reentry when the reentering vehicle is incapable of a satisfactory unassisted landing. The vehicle is slowed by means of parachutes, and then a specially-equipped aircraft matches the vehicle's trajectory and catches it in mid-air.

Contents

This is a risky technique, and so is only used when other forms of landing are infeasible. Successful mid-air retrieval requires correct operation of the retrieving aircraft, favourable atmospheric conditions, and successful execution of a tricky manoeuvre, in addition to correct operation of the vehicle itself. These risks can be mitigated somewhat: for example, multiple recovery aircraft can be used. The need for human aviators to perform a manoeuvre which would normally be classed as a stunt may in the future be avoided by advances in unmanned aerial vehicles and spacecraft reentry.

Notable uses of the technique:

See also

References

  1. Kelly, John W. (23 June 2016). "Mid-Air Retrieval of Heavy, Earth-Returning Space Systems" (PDF). NASA. Retrieved 26 September 2018.
  2. Mulcahy, Robert D. "CORONA Star Catchers" (PDF). National Reconnaissance Office. pp. 205–206. Retrieved 20 July 2018.
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