A new combination windmill anemometer and vane under the name of Aerovane, constructed by the Friez Instrument Division of Bendix Aviation Corp. was tested in the natural wind at Blue Hill Observatory. The anemometer was compared with a standard 3-cup, a 6-bladed duralumin windmill, a 3-bladed balsa windmill, and a pressure-tube anemometer. It was exposed to severe weather, including gale-driven rain, snow, sleet, hail, and freezing rain. The maximum wind measured was 94 mph. Although its starting speed of 2 mph is not as low as in other types, there are no essential differences, and its responsiveness to changes in speed and its capacity for indicating maximum gusts seems to be practically equal to those of mills and pressure-tube anemometers. The Aerovane, in common with other mill and pressure-suction types, appears to show no over-registration in gusty winds, an appreciable fault of the cup anemometer. The error due to variable angle of attack of the wind in its minor changes of direction seems to be held to negligible proportions, owing to the responsiveness but reduced overswing of the streamlined vane. Though it remains to be seen whether the Aerovane can hold together at maximum hurricane speeds that the cup anemometer can stand, the chances seem good because of the, aerodynamically speaking, “clean” lines of the instrument. The Aerovane seems to be the best all-purpose instrument for measuring wind yet devised.

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1 Extended from paper presented at New York meeting, Jan. 28, 1946.