APPARATUS ON AN AIRCRAFT TO INDICATE THE EXTRA LIFT AVAILABLE FROM SAID AIRCRAFT BEFORE A CHOSEN STALL WARNING ANGLE OF ATTACK IS REACHED

摘要

1,208,985. Aircraft instruments. ROSEMOUNT ENG. CO. 22 Jan., 1968 [10 Feb., 1967], No. 3279/68. Heading B7W. On the exterior of an aircraft is mounted a probe 10 having two ports 14, 15 facing partly forwardly in two directions 16, 17 within a vertical plane, so that when the pressures P 1 , P 2 at said two ports are equal, the aircraft is at its maximum safe angle of attack, there being a differential pressure sensor which supplies an indicator (e.g. a pointer 36 moving on a scale) with a reading proportional to (P 1 -P 2 ). The reading is stated to give the percentage of the available lift which is being used by the aircraft. As shown the pressures P 1 , P 2 are carried by tubes 20, 21, each of which has a narrow bore section 29 to act as a damper on pressure fluctuations, to the two sides of a diaphragm 25 the movement of which is transmitted by linkwork 31 ... 35 to the pointer 36.