airscrew

plural airscrews

1. The propeller of an aircraft; the prop.
2. Any actuator disk whose working fluid is air.

   The [wind] tunnel will be housed in a separate building close to the Railway Research Laboratory. It will be operated by an airscrew driven by a 50 h.p. motor which will draw air through at varying speeds up to 100 m.p.h.

   1952 November, “Notes and News: Wind Tunnel for British Railways”, in Railway Magazine, page 779