GB816870A - Improvements in variable pitch propeller control systems - Google Patents

Improvements in variable pitch propeller control systems

Info

Publication number
GB816870A
GB816870A GB2106256A GB2106256A GB816870A GB 816870 A GB816870 A GB 816870A GB 2106256 A GB2106256 A GB 2106256A GB 2106256 A GB2106256 A GB 2106256A GB 816870 A GB816870 A GB 816870A
Authority
GB
United Kingdom
Prior art keywords
spring
pitch
piston
speed
plunger
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
GB2106256A
Inventor
Peter Brett
Denis John Milner Emerson
Donald Keerie
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.)
HAVILLAND PROPELLERS Ltd DE
De Havilland Propellers Ltd
Original Assignee
HAVILLAND PROPELLERS Ltd DE
De Havilland Propellers Ltd
Filing date
Publication date
Application filed by HAVILLAND PROPELLERS Ltd DE, De Havilland Propellers Ltd filed Critical HAVILLAND PROPELLERS Ltd DE
Publication of GB816870A publication Critical patent/GB816870A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
    • B64C11/30—Blade pitch-changing mechanisms
    • B64C11/38—Blade pitch-changing mechanisms fluid, e.g. hydraulic
    • B64C11/385—Blade pitch-changing mechanisms fluid, e.g. hydraulic comprising feathering, braking or stopping systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

816,870. Variable-pitch screw-propellers. DE HAVILLAND PROPELLERS Ltd. July 4, 1957 [July 6, 1956], No. 21062/56. Class 114. In a control system for variable pitch propellers having a constant speed unit, an overspeed pitch lock governor operates at a predetermined propeller speed and pilot-controlled means are provided for setting the governor to operate at a higher speed e.g. at the maximum takeoff speed. The fine pitch oil line 4 leading to the back of the pitch change piston 2 communicates through lines 11, 10 and a valve 15 with a cylinder 8 containing a spring urged piston 7 carrying a locking tooth 6 adapted to engage locking teeth 5 associated with the piston 2 when the hydraulic pressure above the piston 7 is released. The valve 15 controls this pressure, being moved by centrifugal weights 14 when the speed is excessive to open the oil line 10 to drain 16 and to close the line 11. The valve and weights form part of a control unit 13 having beside a governor spring 19 for the weights 14 a second spring 22 engaged by a plunger 21 open to the third oil line 20 so that during takeoff the pilot may actuate the plunger to compress the second spring 22 and add its resistance to that of the spring 19. The spring 19 is set by rotating a nut 24, Fig. 3, engaging a locking piece 27, against which the spring 19 abuts, keyed to the unit 13 and locked by radial splines 25, 26 on the nut and locking piece respectively. The second spring 22 is similarly adjustable by rotating the housing 28 of the plunger 21.
GB2106256A 1956-07-06 Improvements in variable pitch propeller control systems Expired GB816870A (en)

Publications (1)

Publication Number Publication Date
GB816870A true GB816870A (en) 1959-07-22

Family

ID=1735900

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2106256A Expired GB816870A (en) 1956-07-06 Improvements in variable pitch propeller control systems

Country Status (1)

Country Link
GB (1) GB816870A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3543113A1 (en) * 2018-03-23 2019-09-25 Ge Avio S.r.l. System and method for propeller response enhancement during transition from ground to flight configuration for a turbopropeller engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3543113A1 (en) * 2018-03-23 2019-09-25 Ge Avio S.r.l. System and method for propeller response enhancement during transition from ground to flight configuration for a turbopropeller engine
WO2019180260A1 (en) * 2018-03-23 2019-09-26 Ge Avio S.R.L. System and method for propeller response enhancement during transition from ground to flight configuration for a turbopropeller engine
US11738855B2 (en) 2018-03-23 2023-08-29 Ge Avio S.R.L. System and method for propeller response enhancement during transition from ground to flight configuration for a turbopropeller engine

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