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Aviation History
1922
1922 - 0518.PDF
SEPTEMBER 7, 1922 N.A.C.A. CONTROL POSITION RECORDER* By F. H. Norton [IT is now a matter of some six or seven years since Mr. (now Cohidr.) G. M. Dyott invented and constructed an instrument for recording the movements made by the control lever of an aeroplane during flight. This instrument was aeroplane. The records are taken photographically on a-- standard N.A.C.A. film drum, and the instrument can be quickly installed in any aeroplane. The instrument is of value not only for scientific research on stability and con- Fig. 1.—The N.A.C.A. Control Position Recorder. fitted on the little Dyott monoplane, and some very interesting records were obtained. The instrument described below is, of course, of a much more refined character than was Dyott's, but already as long ago as 1913 or 1914 Dyott realised the information which could be obtained in this way. As no instrument was available at that time, he set to work and trollability, but also as a means of checking up the flying of pilots. The instrument, as shown in Fig. 1, consists essentially of the base-plate and film-drum mounting used on all the N.A.C.A. recording instruments. The constant-speed driving motor (1) rotates the film clutch (2) at a speed of about Fig. Landing. Tail Roip. 2.—Records obtained with the Control Position Recorder. made one for himself. We are pleased to see that the subject is still receiving attention in modern times.—ED., FLIGHT.] A new instrument is described which is capable of simul taneously recording the position of the three controls of an * iTechnical Note No. gf of American National Advisory Committee for Aeronautics. i r.p.m. through worm gearing in the base. The motion of the controls is transmitted to the instrument through the cords (3), which are wrapped around three drums (4). The drums are mounted on a horizontal screw, and contain a spiral spring which keeps the cords wound tightly. Thus . a 12-in. motion on the end of the cord is converted into a 5l8
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