Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1975-11-14
1976-10-12
Blix, Trygve M.
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
116 70, 250303, 340416, 416 61, B64C 2700
Patent
active
039853187
ABSTRACT:
Method and apparatus for continuously detecting cracks in aircraft blades while in flight. A hollow blade is sealed with a pressure differential, either above or below atmospheric. A reduction in the pressure differential such as results from cracks, is detected by a pressure sensor having a member which moves between a high pressure differential position and a low pressure differential position. A radiation source, typically a beta source, is carried on the member and moves from a shielded position to an unshielded position when the pressure differential drops. A radiation detector is mounted on a fixed portion of the aircraft and detects radiation from the source when the member moves to the unshielded position. The detector output may be used to operate a go-no go indicator providing a warning signal when the pressure differential falls below a predetermined value, or to operate an analog indicator providing an output varying as a function of the pressure differential.
REFERENCES:
patent: 2745969 (1956-05-01), Keller
patent: 3113464 (1963-12-01), Shulman
patent: 3158028 (1964-11-01), Chope
patent: 3161774 (1964-12-01), Pinckaers
patent: 3667862 (1972-06-01), Parr
patent: 3677218 (1972-07-01), Dixon et al.
patent: 3739376 (1973-06-01), Keledy
patent: 3801787 (1974-04-01), Johnsen
Dominey Sam C.
Mahoney John J.
Barefoot Galen L.
Blix Trygve M.
Tyco Laboratories, Inc.
LandOfFree
Helicopter blade crack indicator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Helicopter blade crack indicator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Helicopter blade crack indicator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-937612