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Aviation History
1928
1928 - 0043.PDF
JANUARY 19, 1928 A NEAT STALL WARNING DEVICE IN view of the number of accidents which have as their initial•cause the stalling of the aeroplane at a low height, it is small wonder that numerous inventions have been put forwardfor giving the pilot warning. In the Savage-Bramson anti- stall gear, the designers have gone a step farther in thatnot only does their device warn the pilot that he is about to stall, but the mechanism actually automatically carriesout the correct operation, i.e., it pushes the stick forward. There are, however, many pilots who fear that this movement least warn the pilot that he is approaching the stalling condi- tion should be a welcome addition to the equipment. Of TO STALL DETECTOR INSTRUMENT THE BARROS STALL WARNING DEVICE : Electricalwiring diagram of installation in a machine fitted with •...". wireless. might lead to trouble by dipping the machine while close to the ground, and thus there is, perhaps, a tendency to dislike this device for that reason. The pilot can, of course, overcome the pull of the stall gear, but many hold that any interference with the delicate touch of the pilot at a critical moment may cause trouble. Whatever may be one's opinions on that score, and a very good case can be made out for, as well as against, such a device, there is little doubt that some device which will at 45 X o; £40 00 ^35 Q CL in QZ30 J _ - - - - - - - - - - - - - - - \ \ \ <\ \ 1\l 'k\ \ \ \ y -- -- -- -- -- - • - - • • - 1 - - M 0-3 0-5 07 PLATE WIDTH -INCHES THE BARROS STALL WARNING DEVICE : N.P.L.Calibration curve of the small wind vane. devices of this nature, we have seen none simpler, neater, lighter, nor less likely to get out of order than that invented by Mr. J. Barros, and which is illustrated here. This device, VANE THE BARROS STALL WARNING DEVICE : Details are shown on the left. The device consists essentially of a small vane exposed to the wind, working against the tension of a spring. As the speed drops to near stalling speed, the vane moves forward and makes contact with a light leaf spring. At still lower speeds, or when the machine is stationary, the vane is right forward, and the contact is broken. At higher speeds the vane 3s back, the cam forward and again contact is broken. Closing the contact operates a buzzer in tbe pilot's helmet. The other sketches show the stall warning device mounted on a strut, and the helmet with buzzer and plug-in jack for connecting to battery and stall device. 43
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