GB624133A - A bombing instrument for aircraft - Google Patents

Abstract

624,133. Bomb - sighting apparatus. SVENSKA AEROPLAN AKTIEBOLAGET, FAXEN, P. T., and WILKENSON, E. A. Feb. 28, 1947, No. 5815. [Class 92 (ii)] A bombing instrument is adapted to release bombs automatically on the correct trajectory towards a target during the pull-out after a glide or dive towards the target, and for this purpose comprises means for measuring the position and state of the aircraft in relation to the target, means for evaluating continuously during the pull-out a quantity #y which represents the difference between the direction of motion of the craft and the direction necessary to secure a hit, and a release impulse mechanism for releasing the bombs when #y becomes zero. In the construction shown the mechanism is brought into operation by a push-button at a point 3a just. before the pull-out and includes release mechanism 6 which functions when the following equation is satisfied : # - α=#, # being the angle through which a fixed optical axis 4b on the craft turns during the pull-out, a being the angle between the optical axis and the tangent v to the flight path, and # being the requisite angle of divergence. As shown diagrammatically in Fig. 4, such data is fed to the mechanism 6, being combined together by differential gear, the data # serving to rock a pivoted arm carrying an electric contact, and data a and e serving to rock a second arm also fitted with a contact which co-operates with the first to release the bombs when the formula is satisfied. The value # is obtained from a gyroscope 7 which is released for operation when the push-button is pressed. The angle x is determined by an equation depending on the specific wing loading G/F of the aircraft, its acceleration n in a direction perpendicular to the plane containing the wings and fuselage, the dynamic air pressure q, and certain constants. These are obtained as shown by a manual control 9, accelerometer 10, and manometer 11, and are combined in accordance with the formula by a calculating device 8 which feeds a to the mechanism 6. The requisite angle e is given as a function of the angle of dive #, height of release h, velocity v, and wind speed u, and the Specification describes how it is possible to obtain data corresponding to that angle in a calculating mechanism from apparatus which includes a manometer 17 for obtaining static air pressure p, a control 18 in which is set air pressure p, at ground level, a manometer 11 for obtaining dynamic air pressure, a gyroscope 14 for obtaining #, a control 13 for setting in u, and calculating mechanisms 15, 16. Such devices are interconnected as shown in Fig. 4. In a modification the positional data set in to the mechanisms correspond to the various angles to the horizontal.