Abstract An apparatus for indicating to the pilot of an aircraft whether to abort a takeoff because of subnormal acceleration during the takeoff run includes: an elongated chart of the normal takeoff acceleration versus takeoff time for the aircraft for a particular set of conditions; a warning indicator; means adapted to scan the chart and responsive to subnormal takeoff acceleration for actuating the warning indicator. The chart is movable linearly and is provided with a conductive area representing the subnormal takeoff acceleration versus takeoff time relationship for the aircraft and a particular set of conditions. The actuating means for the warning indicator includes a contact engageable with such conductive area that is movable relative to the actual aircraft acceleration. An aircraft utilizing the apparatus is provided with a set of charts covering different airports, aircraft weights, wind and barometric pressure and other variable conditions that affect takeoff requirements.
Inventors
👤 Raymond J Hansen
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-23 17:06
CPC Classifications
G; G01; G01C; G01C23/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
In an aircraft takeoff abort indicator, the combination of: a. a chart holder; b. a chart mounted for linear movement on said holder and having a representation of normal takeoff acceleration versus takeoff time for the aircraft, said chart being generally rectangular and having a conductive area representing the subnormal takeoff acceleration versus takeoff time relationship for the aircraft; c. chart driving means for moving said chart linearly at a constant rate and thereby displacing the takeoff time scale on said chart past a reference point; d. an acceleration indicator at said reference point adapted to indicate on said chart the actual takeoff acceleration of the aircraft versus takeoff time; e. acceleration responsive means responsive to the actual takeoff acceleration of the aircraft for actuating said acceleration indicator; f. a warning indicator; and g. actuating means including a contact engageable with said conductive area and adapted to scan the normal takeoff acceleration versus takeoff time relationship on said chart as it moves linearly, and responsive to subnormal takeoff acceleration of the aircraft, for actuating said warning indicator.
Claim 2
Dependent Claim
177 words
In an aircraft takeoff abort indicator, the combination of: a. a chart holder; b. a chart mounted for linear movement on said holder and having a representation of normal takeoff acceleration versus takeoff time for the aircraft, said chart being generally rectangular and having a conductive area representing the subnormal takeoff acceleration versus takeoff time relationship for the aircraft; c. chart driving means for moving said chart linearly at a constant rate and thereby displacing the takeoff time scale on said chart past a reference point; d. an acceleration indicator at said reference point adapted to indicate on said chart the actual takeoff acceleration of the aircraft versus takeoff time; e. acceleration responsive means responsive to the actual takeoff acceleration of the aircraft for actuating said acceleration indicator; f. a warning indicator; and g. actuating means including a contact engageable with said conductive area and adapted to scan the normal takeoff acceleration versus takeoff time relationship on said chart as it moves linearly, and responsive to subnormal takeoff acceleration of the aircraft, for actuating said warning indicator.
Claim 3
Dependent Claim
35 words
An abort indicator according to claim 1 including another conductive area on and extending across one end of the chart at a point on the time scale indicating the maximum permissible takeoff time without aborting.
Claim 4
Dependent Claim
28 words
An abort indicator as defined in claim 2 wherein said holder is fixed and said chart has a vertical takeoff acceleration scale and a horizontal takeoff time scale.
Claim 5
Dependent Claim
35 words
An abort indicator as defined in claim 1 wherein said chart driving means is a cylindrical roller that frictionally engages said chart and moves it linearly in the same direction as its takeoff time scale.