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EP0174082A1 - Empennage stabilisateur pour un projectile - Google Patents

Empennage stabilisateur pour un projectile Download PDF

Info

Publication number
EP0174082A1
EP0174082A1 EP85305205A EP85305205A EP0174082A1 EP 0174082 A1 EP0174082 A1 EP 0174082A1 EP 85305205 A EP85305205 A EP 85305205A EP 85305205 A EP85305205 A EP 85305205A EP 0174082 A1 EP0174082 A1 EP 0174082A1
Authority
EP
European Patent Office
Prior art keywords
fin
fins
welding
fin unit
projectile
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.)
Withdrawn
Application number
EP85305205A
Other languages
German (de)
English (en)
Inventor
Richard Edward Judd
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.)
Judd Engineering Ltd
Original Assignee
Judd Engineering Ltd
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 Judd Engineering Ltd filed Critical Judd Engineering Ltd
Publication of EP0174082A1 publication Critical patent/EP0174082A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/02—Stabilising arrangements
    • F42B10/04—Stabilising arrangements using fixed fins
    • F42B10/06—Tail fins

Definitions

  • This invention relates to stabilising fin units as fitted to the rear of projectiles or missiles (herinafter referred to as projectiles) for maintaining an accurate trajectory or flight of the latter.
  • the fin units consist usually of a tubular body or core member having radial fins, the body being screwed or otherwise rigidly secured to a rear part of a projectile in an axial arrangement.
  • the projectiles to which such fin units are fitted are designed for different levels of performance according to the function they are required to perform.
  • a high performance projectile attains a high speed in flight and this requires a correspondingly high energy charge to propel it from its launcher.
  • the fin unit has to withstand a correspondingly high heat input arising from the burning of the propellant charge.
  • a lower performance projectile which travels slower will be subjected to a correspondingly lower heat input.
  • the fin unit also has to withstand the loads encountered during the flight of the projectile. The mechanical properties of the material from which the fin unit is constructed will be adversely affected dependant upon the temperature attained in firing and when in flight due to frictional drag at supersonic speed.
  • a stabilising fin unit comprises a tubular body and a plurality of radial or similarly directed fins extending longitudinally of the body and secured thereto by welding or the like, said fins being uniformly distributed about the periphery of the body.
  • the method of manufacture of the fin unit comprises arranging a plurality of radial or similarly directed fins about a tubular body and extending longitudinally thereof said fins being spaced uniformly around the periphery of the body, and securing each fin to the body by welding or the lik 0 .
  • a welding head or the like is used on each side of a fin and, in a single pass, simultaneous welds or the like are made along the length or major part of the length of each side of a fin,
  • More than one fin may be secured to the body simultaneously in a single pass by using welding or the like equipment having a plurality of pairs of welding heads or the like, each pair serving to weld one fin.
  • the body and fins are of metal having a performance at elevated temperature superior to that of aluminium and its alloys.
  • FIGS 1 and 2 show a stabilising fin unit 10 having round section tubular body or core 12 with radial fins 14 arranged around the body 12, extending lengthwise thereof, and secured to it by welding along the whole or a portion of the length of each side of a fin.
  • the welds are indicated at 16 i.e. between each side of the fin 14 immediately adjacent its base 18 and the adjacent exterior periphery of the body 12.
  • the fins may be welded to the surface of the body 1 or alternatively the base 18 of each fin may be secured in a respective longitudinal groove 20 by welding.
  • the grooves 20 are equiangularly spaced about the exterior of the body and are shown in dotted lines.
  • pulsed TIG tungsten inert gas
  • a welding head or the like may be used on each side of a fin to make simultaneous welds along the length of each side of a fin.
  • Welding equipment having a number of pairs of welding heads may be used, each pair serving to weld one fin, to secure more than one fin simultaneously in a single pass.
  • Each fin 14 is of increasing radial extent from the leading end towards the rear end of the body 12. Also the outer edge portion of each fin 14 is chamfered on one side at 22 whereby required rotation is imparted, by relative air flow, to the fin unit about its axis and likewise to the projectile or missile to which it is fitted, for maintaining required accuracy of the trajectory or flight of the projectile under operational conditions.
  • the body 12 and fins 14 are of stainless steel or other suitable material and in the example shown six equispaced radial fins 14 are provided about the body 12 but the number may be varied according to requirements.
  • the fins 14 are shown parallel to the axis of the body 12 but if desired they may have some inclination to the axis in providing a helix or similar formation to the fins 14.
  • the fins may extend with some variation from the true radial direction.
  • the body 12 has a coaxial bore 24 which is screw threaded as necessary (not shown) for screw on mounting of the fin unit on a co-operating rear part of a projectile which screw threaded engagement tends to be tightened by the rotation imparted to the fin unit during flight.
  • the bore 24 is shown to indicate its size at the time the fins are welded on and to accept any distortion during welding. It is then machined and screw threaded to provide a body of thinner section and hence less weight.
  • Pulsed T.I.G. welding is a preferred process for securing the fins to the body because heating is very localised with this process thus minimising risk of distortion.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arc Welding In General (AREA)
EP85305205A 1984-07-23 1985-07-22 Empennage stabilisateur pour un projectile Withdrawn EP0174082A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8418743 1984-07-23
GB8418743 1984-07-23
GB8510782 1985-04-27
GB8510782 1985-04-27

Publications (1)

Publication Number Publication Date
EP0174082A1 true EP0174082A1 (fr) 1986-03-12

Family

ID=26288021

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85305205A Withdrawn EP0174082A1 (fr) 1984-07-23 1985-07-22 Empennage stabilisateur pour un projectile

Country Status (1)

Country Link
EP (1) EP0174082A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988005522A1 (fr) * 1987-01-27 1988-07-28 Honeywell Inc. Projectile traçant perforant avec ailettes stabilisatrices et son procede de fabrication
WO1988007169A1 (fr) * 1987-03-17 1988-09-22 The Secretary Of State For Defence In Her Britanni Plan fixe de queue pour un projectile
EP0295362A1 (fr) * 1987-06-13 1988-12-21 Rheinmetall GmbH Projectile sous-calibré comportant un empennage
FR2721701A1 (fr) * 1994-06-28 1995-12-29 Giat Ind Sa Empennage pour projectile, notamment pour projectile sous-calibré supersonique.
AU2003262437B2 (en) * 2002-11-22 2008-12-11 Biosense, Inc. Dynamic metal immunity
CN110375594A (zh) * 2019-06-28 2019-10-25 南京理工大学 一种适用于小角度入水的超空泡长尾射弹
CN113899252A (zh) * 2021-10-21 2022-01-07 上海机电工程研究所 用于弹翼与弹体间的连接装置及导弹

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191512985A (en) * 1915-09-10 1916-06-22 Charles Bingham Improvement in Explosive Projectiles.
FR592328A (fr) * 1930-06-20 1925-07-31 Perfectionnements aux projectiles pour bouches à feu à âme lisse
US2494026A (en) * 1945-03-28 1950-01-10 Anderson Nelson Projectile
FR1032036A (fr) * 1951-02-03 1953-06-29 Empennage de projectiles et son procédé de fabrication
US2831957A (en) * 1954-08-19 1958-04-22 American Locomotive Co Method and apparatus for forming finned structures
US3233074A (en) * 1961-09-20 1966-02-01 Babcock & Wilcox Ltd Machine for forming tubes with longitudinally extending fins
US3378216A (en) * 1966-04-29 1968-04-16 Susquehama Corp Integral fin canister-nozzle exit cone
US3596051A (en) * 1970-03-20 1971-07-27 Nippon Koran Kk Method and apparatus for forming t-welds
FR2099880A5 (fr) * 1970-07-11 1972-03-17 Tampella Oy Ab

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191512985A (en) * 1915-09-10 1916-06-22 Charles Bingham Improvement in Explosive Projectiles.
FR592328A (fr) * 1930-06-20 1925-07-31 Perfectionnements aux projectiles pour bouches à feu à âme lisse
US2494026A (en) * 1945-03-28 1950-01-10 Anderson Nelson Projectile
FR1032036A (fr) * 1951-02-03 1953-06-29 Empennage de projectiles et son procédé de fabrication
US2831957A (en) * 1954-08-19 1958-04-22 American Locomotive Co Method and apparatus for forming finned structures
US3233074A (en) * 1961-09-20 1966-02-01 Babcock & Wilcox Ltd Machine for forming tubes with longitudinally extending fins
US3378216A (en) * 1966-04-29 1968-04-16 Susquehama Corp Integral fin canister-nozzle exit cone
US3596051A (en) * 1970-03-20 1971-07-27 Nippon Koran Kk Method and apparatus for forming t-welds
FR2099880A5 (fr) * 1970-07-11 1972-03-17 Tampella Oy Ab

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988005522A1 (fr) * 1987-01-27 1988-07-28 Honeywell Inc. Projectile traçant perforant avec ailettes stabilisatrices et son procede de fabrication
WO1988007169A1 (fr) * 1987-03-17 1988-09-22 The Secretary Of State For Defence In Her Britanni Plan fixe de queue pour un projectile
GB2228987A (en) * 1987-03-17 1990-09-12 Secr Defence Tail fin unit for a projectile
GB2228987B (en) * 1987-03-17 1991-01-23 Secr Defence Tail fin unit for a projectile
EP0295362A1 (fr) * 1987-06-13 1988-12-21 Rheinmetall GmbH Projectile sous-calibré comportant un empennage
FR2721701A1 (fr) * 1994-06-28 1995-12-29 Giat Ind Sa Empennage pour projectile, notamment pour projectile sous-calibré supersonique.
EP0690283A1 (fr) * 1994-06-28 1996-01-03 Giat Industries Empennage pour projectile, notamment pour projectile sous-calibré supersonique
US5622335A (en) * 1994-06-28 1997-04-22 Giat Industries Tail piece for a projectile having fins each including a recess
AU2003262437B2 (en) * 2002-11-22 2008-12-11 Biosense, Inc. Dynamic metal immunity
CN110375594A (zh) * 2019-06-28 2019-10-25 南京理工大学 一种适用于小角度入水的超空泡长尾射弹
CN113899252A (zh) * 2021-10-21 2022-01-07 上海机电工程研究所 用于弹翼与弹体间的连接装置及导弹

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19861113

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Inventor name: JUDD, RICHARD EDWARD