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787,102. Aircraft fitted with high lift devices. SOC. NATIONALE DE CONSTRUCTIONS AERONAUTIQUES DU NORD. Nov. 7, 1955 [Feb. 26, 1955], No. 31749/55. Class 4. An aircraft equipped with a high-lift device has also a device for compensating for any diving moment produced by the high lift device, comprising a parachute attached to the aircraft at a point above its centre of gravity, and means for deploying the parachute at the same time as the high lift device becomes operative. In Fig. 2, the elevators 2 are depressed for high lift by a jack 13 controlled by a pilot's control 11. When the jack nears the completion of its stroke, contacts 15 bridge contacts 14 and the cover 8 of the tail fin mounted parachute housing 4 is electrically released, whereupon the spring 10 ejects a pilot parachute 9 withdrawing the main canopy 3. In Fig. 6 an auxiliary line 26 extends from a pilot-controlled winch 19 to the apex of the canopy 3, whereby the pilot may controllably invert the canopy, varying the drag and hence the pitching moment produced. In Fig. 4 (not shown) the anchorage point of the canopy is movable vertically along the trailing edge of the fin by a pilot controlled winch, again to control the pitching moment. Yawing control in this case is by the use of spoilers. In Fig. 5, the parachute'is normally housed in a tube 4 in the fin, and when deployed is attached to the aircraft fin by two lines, one 20 of fixed length and the other 23 of a length adjusted by the pilotcontrolled winch 19, so that the line of action of the drag may be varied as shown in dashed lines.
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