GB818701A - Improvements in or relating to control systems for aircraft propellers - Google Patents

Improvements in or relating to control systems for aircraft propellers

Info

Publication number
GB818701A
GB818701A GB3344856A GB3344856A GB818701A GB 818701 A GB818701 A GB 818701A GB 3344856 A GB3344856 A GB 3344856A GB 3344856 A GB3344856 A GB 3344856A GB 818701 A GB818701 A GB 818701A
Authority
GB
United Kingdom
Prior art keywords
pitch
propellers
propeller
solenoids
control means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3344856A
Inventor
Alfred Dennis Jackson
John Alfred Chilman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rotol Ltd
Original Assignee
Rotol Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rotol Ltd filed Critical Rotol Ltd
Priority to GB3344856A priority Critical patent/GB818701A/en
Publication of GB818701A publication Critical patent/GB818701A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64CAEROPLANES; HELICOPTERS
    • B64C11/00Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
    • B64C11/30Blade pitch-changing mechanisms
    • B64C11/32Blade pitch-changing mechanisms mechanical
    • B64C11/325Blade pitch-changing mechanisms mechanical comprising feathering, braking or stopping systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Catching Or Destruction (AREA)
  • Control Of Turbines (AREA)

Abstract

818,701. Variable pitch propellers. ROTOL, Ltd. Oct. 29, 1957 [Nov. 1, 1956; Jan. 10, 1957; Feb. 20, 1957], Nos. 33448/56, 1071/57 and 5794/57. Class 114. In a multi-engined aircraft having gasturbine propeller engines, the propellers each including a constant speed unit, a control system for the propellers comprising for each propeller, a pitch stop which is operative in flight and which prevents the propeller fining off to an angle such that excessive windmilling speeds can occur in the event of failure of the constant speed unit of the propeller, sensing means for sensing when the propeller has fined off to a predetermined pitch at least approaching that set by said pitch stop, and control means for withdrawing said pitch stops, the control means is connected with the sensing means of the propellers to operate to withdraw the pitch stops of all the propellers when all the propellers have fined off to the predetermined pitch. The sensing means for each propeller comprises an electrical switch (10 in the embodiment shown) which is closed when the propeller is at and below said predetermined pitch, and the control means comprises solenoids 12, switches being connected in series with one another and the solenoids, and the solenoids being connected in parallel with one another, and energizable each to initiate the withdrawal of the pitch stop of one of the propellers e.g. by controlling a valve in a hydraulic circuit. A double pole manual switch 14 is provided to isolate the circuit from the electrical source 15 and place the withdrawal of the pitch stops entirely under the control of the pilot by closure of a double pole manual switch 13. Other embodiments include a warning light. Specification 818,611 is referred to.
GB3344856A 1956-11-01 1956-11-01 Improvements in or relating to control systems for aircraft propellers Expired GB818701A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3344856A GB818701A (en) 1956-11-01 1956-11-01 Improvements in or relating to control systems for aircraft propellers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3344856A GB818701A (en) 1956-11-01 1956-11-01 Improvements in or relating to control systems for aircraft propellers

Publications (1)

Publication Number Publication Date
GB818701A true GB818701A (en) 1959-08-19

Family

ID=10353085

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3344856A Expired GB818701A (en) 1956-11-01 1956-11-01 Improvements in or relating to control systems for aircraft propellers

Country Status (1)

Country Link
GB (1) GB818701A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3594109A1 (en) * 2018-07-10 2020-01-15 Pratt & Whitney Canada Corp. System and method for feathering an aircraft propeller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3594109A1 (en) * 2018-07-10 2020-01-15 Pratt & Whitney Canada Corp. System and method for feathering an aircraft propeller

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