1945-01-01

A Means for Warning of Incipient Breakdown of Smooth Airflow over Airfoil Surfaces 450177

THE lack of feel and sense of air speed that goes with large air transports, as well as the variable weights at which they are flown, has made the use of a stall-warning device desirable.
In recognition of this fact, a number of stall-warning systems have been devised. Given here are the principles of one of them, along with an outline of the test results that have been achieved with it.
This system consists of a number of airflow sensitive units mounted on the rear portion of the wing and on the low-pressure side. These units provide electrical contacts that close to illuminate individual warning lights or to provide an increasing indication on an ammeter easily visible to the pilot.

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