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THE role of the National Advisory Committee for Aeronautics in the present national effort devoted to the development of guided missiles is quite similar to the role the N.A.C.A. has taken for many years in connexion with piloted aircraft. This role, as specified by Congress in 1915, is to ‘supervise and direct the scientific study of the problems of flight with a view to their practical solution’. While the advent of guided missiles has naturally introduced some new aerodynamic problems, many of the problems are the same as those of piloted aircraft. The chief job of the N.A.C.A. is to find solutions to these problems and to supply the information necessary for the scientific design of aeroplanes and missiles. The present interest in both types of aircraft covers subsonic speeds, transonic speeds, and supersonic speeds. The N.A.C.A. has three laboratories devoted to this research. These laboratories are located at Moffett Field, Calif.; Cleveland, Ohio; and Langlcy Field, Va. Each of these laboratories has wind tunnels and other facilities devoted to the guided missile effort. Since the wind‐tunnel work of the N.A.C.A. is well known, 1 would like to review a lesser‐known programme being conducted by the N.A.C.A.'s Langley Laboratory by means of rocket‐propelled test models at its Pilotless Aircraft Research Station at Wallops Island, Va.

M Alayrac gives here the further results of his investigations of irrotational three dimensional flow of which he has already written in Publications Scientifiques Nos. 3 and 13 (cf. abstracts in AIRCRAFT ENGINEERING, Vol. IV, Nos. 38 and 42, March and December, 1932). The examples already dealt with show that the flow about a finite surface even with high aspect ratio differs very widely from uniplanar flow. The final purpose of the work is not, however, to find the sole flow, with given velocity at infinity and finite velocity at every point, for this flow being non‐productive of resistance is of no interest from the point of view of aero‐dynamics, but it is defined as the search for flows with points, lines or surfaces of infinite velocity which have no sense in perfect fluids but which are acceptable in viscous fluids, the regions of infinite velocity being replaced by regions of turbulence.

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Committee, Reports and Technical Notes of the U.S. National Advisory Committee for Aeronautics and publications of other similar research bodies as issued

In a retractable landing gear for aircraft a cantilever strut carrying a wheel for ground contact, a sleeve swingably mounted on said aircraft within which said strut slidably engages, means for sliding said strut with respect to said sleeve, and means for constraining the end of said strut to a predetermined path of movement during sliding thereof with respect to said sleeve.

Under this heading are published regularly abstracts of all Reports and Memoranda or the Aeronautical Research Committee, Reports and Technical Notes of the United States National Advisory Committee for Aeronautics and publications of other similar Research Bodies as issued.

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Committee, Reports and Technical Notes of the U.S. National Advisory Committee for Aeronautics, and publications of other similar research bodies as issued

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Committee, Reports and Technical Notes of the U.S. National Advisory Committee for Aeronautics, and publications of other similar research bodies as issued

The usual method of determining the characteristics of an airscrew by the curves of ? and x as a function of the advance/ diameter ratio neglects the deformations to which an airscrew in rotation is subject, and, desiring a more accurate method of investigation, the Service des Recherches de l'Aéronautique asked Commandant Ledoux to work out a method capable of practical application for the measurement of deformations. This report gives in detail the results of his work.

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Committee, Reports and Technical Notes of the U.S. National Advisory Committee for Aeronautics, and publications of other similar research bodies as issued

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Committee, Reports and Technical Notes of the U.S. National Advisory Committee for Aeronautics, and publications of other similar research bodies as issued