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US4856943A Expired / Lapsed US ⏱️ 0.0 years remaining

Airfoil incidence angle adjustment method

Assignee: RTX Corp
•
Filing: 1988-04-29
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Granted: 1989-08-15
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Expires: 2008-04-29
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Abstract

Abstract A method of providing interchangeability of aircraft wings, particularly providing a method of adjusting the angles of incidence and dihedral to compensate for differences in the twist angle between airfoils. The method comprises determining the angle of twist of an airfoil, having an airfoil attachment member, and supporting the airfoil on at least three supports spaced about said airfoil so that the airfoil attachment member is aligned with a hole boring means. The supports are adjusted so that the hole when bored through the airfoil attachment member provides the airfoil with angles of incidence and dihedral that substantially cancel the angle of twist. The hole is bored through the airfoil attachment member.

Inventors

  • 👤 Carl W. Nelson
  • 👤 Donald S. Smith
  • 👤 Frank P. Turner

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 07:12
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49764; Y10T29/49771; Y10T29/49826; Y10T29/49861; Y10T29/49972; Y10T408/00; Y10T408/03; Y10T408/55; Y10T408/561; Y10T408/5614

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 112 words
A method of boring a hole in an airfoil attachment member, said member connected to an airfoil, said hole used for attaching said airfoil to an aircraft, said airfoil having an angle of twist, comprising: (a) determining the angle of twist of said airfoil; (b) supporting said airfoil on at least three supports spaced about said airfoil so that said airfoil attachment member is aligned with a hole boring means; (c) adjusting said supports so that said hole when bored through the airfoil attachment member will provide the airfoil with angles of incidence and dihedral that substantially cancel the angle of twist; and (d) boring said hole through said airfoil attachment member.
Claim 2
Independent Claim 112 words
A method of boring a hole in an airfoil attachment member, said member connected to an airfoil, said hole used for attaching said airfoil to an aircraft, said airfoil having an angle of twist, comprising: (a) determining the angle of twist of said airfoil; (b) supporting said airfoil on at least three supports spaced about said airfoil so that said airfoil attachment member is aligned with a hole boring means; (c) adjusting said supports so that said hole when bored through the airfoil attachment member will provide the airfoil with angles of incidence and dihedral that substantially cancel the angle of twist; and (d) boring said hole through said airfoil attachment member.

References Cited (Backward Citations)

US2991668A Cited
US3170691A Cited
US3254399A Cited
US3430317A Cited
US3782847A Cited
US4040763A Cited
US4086017A Cited
US4228976A Cited
US4445264A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-08-14 1993-02-13 1993-08-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-08-14 1997-02-13 1997-08-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-08-14 2001-02-13 2001-08-15 $7700.00 Window Closed / Lapsed

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