Measuring and testing – Navigation – Take-off and landing monitors
Patent
1979-07-09
1981-02-17
Woodiel, Donald O.
Measuring and testing
Navigation
Take-off and landing monitors
73179, G01C 2110
Patent
active
042507464
ABSTRACT:
A combined vertical speed and windshear indicator instrument for an aircraft has a graduated dial (2) and a conventionally driven pointer (3) for indicating the vertical speed. In addition the instrument has an independent pointer (4) which is driven so that it indicates, to the same scale as the vertical speed, the rate of change of total energy of the aircraft (energy rate) according to the formula dh/dt+(V/g)(dV/dt) where h is the height of the aircraft and V is its true air speed. Under stable flight conditions the pointers (3 and 4) will track together, but if there are any sudden changes, particularly changes due to windshear, the pointers will separate to indicate the effect of the changes so that the necessary corrective action can be taken by the pilot. The energy rate pointer (4) is driven by a signal (22) derived from input signals (5 and 6) which respectively represent the vertical speed h and the true air speed V of the aircraft and which are delayed by the use of filters (10, 14 and 20 ) for reducing noise interference. The response time of the energy rate pointer (4) to sudden acceleration of the aircraft itself is therefore improved by deriving the (dV/dt) term of the energy rate drive signal (22), for a short period following the sudden acceleration, from a signal (24) representative of the longitudinal acceleration x of the aircraft.
REFERENCES:
patent: 3496769 (1970-02-01), Vietor
patent: 3789661 (1974-02-01), Melsheimer
patent: 4021010 (1977-05-01), Bliss
patent: 4127249 (1978-11-01), Lambregts
Fisher Alexander B.
Vassie Craig D.
British Airways Board
Woodiel Donald O.
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