Tunnel

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Tunnel

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1. A structure, installation, or facility incorporating apparatus to simulate flight conditions in one way or another, specially designed for testing or experimenting with power plants, or with aircraft, rockets, or other aerodynamically designed bodies, engine installations, or models; specifically, a wind tunnel. </dd>
2. A longitudinal protuberance on a rocket body used to house wiring, piping, etc., so as to not route the wiring through the propellant tanks. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use