GB518626A - Improvements in or relating to aeronautical propeller blades and methods of locating the pitch axis of variable-pitch propeller blades - Google Patents

Improvements in or relating to aeronautical propeller blades and methods of locating the pitch axis of variable-pitch propeller blades

Info

Publication number
GB518626A
GB518626A GB2532538A GB2532538A GB518626A GB 518626 A GB518626 A GB 518626A GB 2532538 A GB2532538 A GB 2532538A GB 2532538 A GB2532538 A GB 2532538A GB 518626 A GB518626 A GB 518626A
Authority
GB
United Kingdom
Prior art keywords
blade
moment
centre
centrifugal
propeller blades
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
GB2532538A
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 GB2532538A priority Critical patent/GB518626A/en
Publication of GB518626A publication Critical patent/GB518626A/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
    • B64C11/16—Blades
    • B64C11/18—Aerodynamic features

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

518,626. Screw propellers. TENNANT, W. J. (Aviation Patents, Inc.). Aug. 29, 1938, No. 25325. Drawings to Specification. [Class 114] Screw propeller blades intended to be mounted for pitch adjustment are arranged so that the blade axis lies within the confines of the blade throughout the major length and the centre of gravity of the blade is located toward the leading edge of the blade from the blade axis whilst the centre of pressure of each blade section is closer to the leading edge than the centre of gravity, whereby there is 'substantial balance between the centrifugal and aerodynamic moments about the blade axis. The centre of pressure is selected so that the net blade torque at the extreme limits of the normal range of operation will be in opposite directions, and also the aerodynamic movement exceeds the centrifugal moment under take off conditions, whilst the reverse occurs at maximum flight conditions. At the time when the centrifugal moment equals the aerodynamic moment for a selected flight condition, the centrifugal, moment predominates in an inner radial zone of the blade whilst aerodynamic moment predominates in an outer zone and the two moments are locally equal at the junction of the two zones.
GB2532538A 1938-08-29 1938-08-29 Improvements in or relating to aeronautical propeller blades and methods of locating the pitch axis of variable-pitch propeller blades Expired GB518626A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2532538A GB518626A (en) 1938-08-29 1938-08-29 Improvements in or relating to aeronautical propeller blades and methods of locating the pitch axis of variable-pitch propeller blades

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2532538A GB518626A (en) 1938-08-29 1938-08-29 Improvements in or relating to aeronautical propeller blades and methods of locating the pitch axis of variable-pitch propeller blades

Publications (1)

Publication Number Publication Date
GB518626A true GB518626A (en) 1940-03-04

Family

ID=10225852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2532538A Expired GB518626A (en) 1938-08-29 1938-08-29 Improvements in or relating to aeronautical propeller blades and methods of locating the pitch axis of variable-pitch propeller blades

Country Status (1)

Country Link
GB (1) GB518626A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5057696A (en) * 1991-01-25 1991-10-15 Wind Harvest Co., Inc. Vertical windmill with omnidirectional diffusion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5057696A (en) * 1991-01-25 1991-10-15 Wind Harvest Co., Inc. Vertical windmill with omnidirectional diffusion
WO1992013192A1 (en) * 1991-01-25 1992-08-06 Wind Harvest Co., Inc. Self-braking windmill

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