GB748797A - Method of and apparatus for determining and adjusting the aerodynamic pitching moment of a full-sized rotary aerodynamic member - Google Patents

Method of and apparatus for determining and adjusting the aerodynamic pitching moment of a full-sized rotary aerodynamic member

Info

Publication number
GB748797A
GB748797A GB30629/53A GB3062953A GB748797A GB 748797 A GB748797 A GB 748797A GB 30629/53 A GB30629/53 A GB 30629/53A GB 3062953 A GB3062953 A GB 3062953A GB 748797 A GB748797 A GB 748797A
Authority
GB
United Kingdom
Prior art keywords
blade
pitching moment
secured
tab
span
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
GB30629/53A
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.)
Doman Helicopters Inc
Original Assignee
Doman Helicopters Inc
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 Doman Helicopters Inc filed Critical Doman Helicopters Inc
Publication of GB748797A publication Critical patent/GB748797A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
    • G01M9/06—Measuring arrangements specially adapted for aerodynamic testing

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)

Abstract

748,797. Helicopters. DOMAN HELICOPTERS, Inc. Nov. 5, 1953 [Nov. 25, 1952], No. 30629/53. Class 4. [Also in Group XIX] To enable a trailing edge tab on a helicopter rotor blade to be pre-set along the span of the blade to angles that give each blade, before assembly on a rotor head, standard pitching moment characteristics, apparatus is provided for determining the pitching moment of a blade at intervals along its span. A blade 10, having a pliable trailing edge tab 12, has the root end of the spar 11 secured on its axis to a wire 14 which passes through a bushing 33 in a bracket 32 mounted on an upright support. The upper end of the wire is clamped by a stud 19 in a collar 18 rotatably secured to a further bracket 17, screws 21 being provided to act on a lever 22 secured to the collar 18 in order that the blade may be rotated about its axis. Tracks 26 are positioned forward of the leading edge of the blade to support a movable carriage 25 which carried a jet nozzle 23 connected with a fan 24 driven by a suitable motor. A clamp 15 secured to the end of the spar 11 carries a pointer 30 co-operating with a scale 31 graduated to give readings of pitching moment of the blade. In operation, the carriage 25 is located with the airstream from the jet 23 directed towards the leading edge of the blade at one end thereof and the screws 21 are adjusted until the blade is set in a " no-lift " attitude as determined by a scale 29 provided to give indication of pendular oscillations. The blade will then turn about its axis against the torsional resilience of the wire 14, and if the reading on the scale 31 differs from a desired value the portion of the tab 12 subjected to the airstream is adjusted until the desired reading is obtained. This operation is repeated at intervals along the span of the blade by movement of the carriage 25 and subsequent adjustment of the appropriate portion of tab. By this means each blade has standard characteristics and the necessity of whirling a complete rotor to track the blades is obviated.
GB30629/53A 1952-11-25 1953-11-05 Method of and apparatus for determining and adjusting the aerodynamic pitching moment of a full-sized rotary aerodynamic member Expired GB748797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US322508A US2716889A (en) 1952-11-25 1952-11-25 Method of determining and adjusting the aerodynamic pitching moment of a full-sized aerodynamic member and apparatus therefor

Publications (1)

Publication Number Publication Date
GB748797A true GB748797A (en) 1956-05-09

Family

ID=23255191

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30629/53A Expired GB748797A (en) 1952-11-25 1953-11-05 Method of and apparatus for determining and adjusting the aerodynamic pitching moment of a full-sized rotary aerodynamic member

Country Status (3)

Country Link
US (1) US2716889A (en)
FR (1) FR1128403A (en)
GB (1) GB748797A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111735602A (en) * 2020-08-10 2020-10-02 中国空气动力研究与发展中心低速空气动力研究所 Low-speed wind tunnel test model abdominal bracing system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2770967A (en) * 1953-11-16 1956-11-20 Doman Helicopters Inc Device for measuring the aerodynamic pitching moments of a short length of a full sized airfoil
US2800020A (en) * 1954-04-30 1957-07-23 Thompson Prod Inc Flowmeter
US2951542A (en) * 1957-10-21 1960-09-06 Parsons Corp Balance and tracking of rotor blades
US3002378A (en) * 1958-03-25 1961-10-03 Advanced Res Associates Inc Isochronic system for testing of aircraft
CN109668500B (en) * 2018-11-28 2024-02-13 惠阳航空螺旋桨有限责任公司 Blade torsion angle measuring tool

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR954640A (en) * 1950-01-04
US2552739A (en) * 1951-05-15 Method of tracking kotor blades
US2039211A (en) * 1933-06-23 1936-04-28 United Aircraft Corp Propeller manufacture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111735602A (en) * 2020-08-10 2020-10-02 中国空气动力研究与发展中心低速空气动力研究所 Low-speed wind tunnel test model abdominal bracing system
CN111735602B (en) * 2020-08-10 2020-11-17 中国空气动力研究与发展中心低速空气动力研究所 Low-speed wind tunnel test model abdominal bracing system

Also Published As

Publication number Publication date
FR1128403A (en) 1957-01-04
US2716889A (en) 1955-09-06

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