Cal Tech Wind Tunnel Prop - 1934


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Vintage original press photo, 7x9", b&w.  Press release on reverse introduces the 14 ft, 11 in propeller attached to a 1000 H.P. motor driving the wind tunnel to 225 mph in the Guggenheim Aeronautical Lab, California Institute of Technology.  Date is 4/8/1934.  Very good, one small corner chip.