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

Abstract

Hollow blades b for air‐screws are constructed from a metal block provided with a blind coaxial bore c first by forging, stamping or rolling to produce the requisite elongation of the block and to impart a cross‐section of desired shape. Secondly, by producing a deformation of the block wall by means of pressure exerted from the inside or from the outside, and finally to form the end a of the blade in a manner suitable for attachment to the propeller hub. When an external pressure is used the interior is filled with plastic material or fluid under pressure. Alternatively, a former or core is introduced having the desired inner shape of the blade. In another method the hollow block is placed in a mould having the required external form of the blade. Preferably the root a of the blade which is hollow is provided with a thread whereby it may be screwed on to radial pins on the hub block

Citation

(1933), "Month in the Patent Office: A Selection of the More Important Aircraft and Engine Specifications Published Recently", Aircraft Engineering and Aerospace Technology, Vol. 5 No. 12, pp. 306-306. https://doi.org/10.1108/eb029757