GB273745A - Improvements in retarding devices with movable planes, serving as a parachute and facilitating the landing of aeroplanes - Google Patents

Abstract

273,745. Ehmig, V., and Hofmann, F. July 1, 1926, [Convention date]. Helicopters; stopping way. - An aeroplane has a series of planes normally housed in a recess in one of the m a i n planes but adapted to be released to form a rotary retarding surface above the machine. In the case of a biplane additional surfaces are housed in the lower plane and hinge upwards into the air stream when released. Fig. 3 shows the machine after planes 7, 8 have been withdrawn from a recess 5 in the upper plane of a biplane to form a rotary retarding device, and after planes 9 have been permitted to rise against stops on the plane bracing. A streamlined central tube 3, Fig. 7, is secured to a frame 14 pivoted to the aircraft at 15 and having a pin 16 at its forward end normally locked at the lower end of a slot 17 on the aircraft frame by a hook 51. Two pairs of planes 7, 8 have central ribs pivoted respectively to two rings 12, 13 rotating about ball bearings provided on the central column. A spider 20 capable of sliding within the column has parts extending through slots 21 and carries ball races for the two rings 23, 26 carrying links 25, 27 which are pivoted to the central ribs of the planes 7, 8. Half-way slots are formed in the planes as shown in Fig. 10 to permit the passage of the links 25, 27. The spider has two projections 32 normally engaged by pivoted hooks 33, but when a cam 36 is moved by the pilot, the lower ends of the hooks are drawn together by a spring 45 to release the projections 32, and the spider 20 is raised by a spring 19 to raise the planes 7, 8. Simultaneously a spring 28 swings the pairs of planes into a position at right-angles to one another. Another cam 43 releases the hook 51 to enable the frame 14 to swing upwards until the pin 16 engages pawls 60 at the top of the slot 17 and simultaneously another hook 52 releases a spring-influenced lever 54 to turn a shaft 56 which releases the planes 9. Portions of the planes as shown at 8b, Fig. 10, may be given an inclination by varying the length of struts 61 to cause the planes 7, 8 to rotate. A screw 63 enables the spider 20 to be forced into its normal position again.