Word: freeflight
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Dates: during 1937-1937
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...High-speed tunnels, spinning tunnels, atmospheric tunnels, variable-density tunnels and propeller research tunnels are old stuff. This year two more were added to the list-a freeflight tunnel and a gust tunnel...
...freeflight tunnel is a cylinder which may be tilted at a normal airplane glide angle. On the bottom rests a small model of a commercial plane which is to be tested for such things as controllability. As the air rushes into the tunnel, the model takes off, flies completely free. Trailing from it is a thread-like copper wire through which the operator can control ailerons and rudders, see how the ship obeys them...