GB343653A - Improvements in variable pitch airscrews - Google Patents

Improvements in variable pitch airscrews

Info

Publication number
GB343653A
GB343653A GB3893529A GB3893529A GB343653A GB 343653 A GB343653 A GB 343653A GB 3893529 A GB3893529 A GB 3893529A GB 3893529 A GB3893529 A GB 3893529A GB 343653 A GB343653 A GB 343653A
Authority
GB
United Kingdom
Prior art keywords
ram
stroke
valve
blade
coupled
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
GB3893529A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3893529A priority Critical patent/GB343653A/en
Publication of GB343653A publication Critical patent/GB343653A/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
    • B64C11/42—Blade pitch-changing mechanisms fluid, e.g. hydraulic non-automatic

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Wind Motors (AREA)

Abstract

343,653. Airscrews. SHAW, H. S. HELE- and BEACHAM, T. E., 64, Victoria Street, London. Dec. 19, 1929, No. 38935. [Class 114.] In hydraulically controlled variable pitch screw propellers wherein a hydraulic ram movable axially with respect to the propeller shaft is employed the pitch of the blades is adjustable to two or more predetermined positions. The limits of the stroke of the ram can be adjusted to correspond to the two or more pitch positions of the blade. Coaxial with the main shaft A and within the hollow spigots a<1>, a2 is mounted a ram cylinder d which is adjustable as to its stroke axially by means of screws x<2>, x<1> and stops d<6>. Inside the cylinder is a ram c<2> which is fixedly carried by a sleeve c mounted on a main boss a<3> ; passages are provided between the two sides of the ram and central supply ducts t<1>, t<2>, t<3>, ml which are in turn coupled by pipes s<1>, s<2>, through a controlling valve v<9> with a hydraulic pressure pump p. The valve v<9> is coupled by a bell-crank lever v<3> with a control rod v<4> having notches v<6>, v<7> adapted to be held by a spring detent v<8>. According to the position of this control, the valve v<9> is positioned relative to the pipes s<3>, s<2> to supply pressure fluid to the required side of the ram c<2>. The other pipe s<1> then acts as an exhaust and the liquid from the other side of the ram flows back to the common tank w. To avoid strains in the stop position, passages become open just before the end of the stroke having a safety valve set to open at a minimum pressure sufficient to prevent blade flutter. The main sliding cylinder d has lugs which are coupled by pins to the roots of the blade for the purpose of angularly adjusting them. Specification, 295,248, [Class 114, Ships &c., Propelling &c.], is referred to.
GB3893529A 1929-12-19 1929-12-19 Improvements in variable pitch airscrews Expired GB343653A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3893529A GB343653A (en) 1929-12-19 1929-12-19 Improvements in variable pitch airscrews

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3893529A GB343653A (en) 1929-12-19 1929-12-19 Improvements in variable pitch airscrews

Publications (1)

Publication Number Publication Date
GB343653A true GB343653A (en) 1931-02-26

Family

ID=10406585

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3893529A Expired GB343653A (en) 1929-12-19 1929-12-19 Improvements in variable pitch airscrews

Country Status (1)

Country Link
GB (1) GB343653A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661807A (en) * 1949-04-28 1953-12-08 Sterling A Fielding Hydraulic pitch control device for propellers
US2807327A (en) * 1954-07-16 1957-09-24 Beech Aircraft Corp Hydraulic control full feathering propeller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661807A (en) * 1949-04-28 1953-12-08 Sterling A Fielding Hydraulic pitch control device for propellers
US2807327A (en) * 1954-07-16 1957-09-24 Beech Aircraft Corp Hydraulic control full feathering propeller

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