Month in the Patent Office: A Selection of the More Important Aircraft and Engine Specifications Published Recently Available to Purchase

One or more streamline struts forming part of the undercarriage of an aircraft are adapted to be turned about their longitudinal axes from a position in which the minor axis of the strut is transverse to the airflow to a position in which the major axis is transverse to the airflow, in order to serve as an air brake. Fig. 3 illustrates an aeroplane undercarriage in which a strut 15 is adapted to be turned through 90 deg. under control of the pilot by means of a handle 19, cross shaft 20, crank arms 21, links 22 and levers 23. Eye‐bolts 16, Fig. 1, at each end of the strut 15 are formed with annular corrugations engaging the corrugations in sleeves 18 secured to the strut structure, thus enabling the strut proper to turn with respect to the eyebolts whilst preventing relative endwise movement.