US3861314A - Concave-compound pointed finned projectile - Google Patents

Concave-compound pointed finned projectile Download PDF

Info

Publication number
US3861314A
US3861314A US60645366A US3861314A US 3861314 A US3861314 A US 3861314A US 60645366 A US60645366 A US 60645366A US 3861314 A US3861314 A US 3861314A
Authority
US
United States
Prior art keywords
projectile
conical
frusto
approximately
length
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 - Lifetime
Application number
Inventor
Irwin R Barr
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.)
AAI Corp
Original Assignee
AAI Corp
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 AAI Corp filed Critical AAI Corp
Priority to US60645366 priority Critical patent/US3861314A/en
Application granted granted Critical
Publication of US3861314A publication Critical patent/US3861314A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B6/00Projectiles or missiles specially adapted for projection without use of explosive or combustible propellant charge, e.g. for blow guns, bows or crossbows, hand-held spring or air guns
    • F42B6/02Arrows; Crossbow bolts; Harpoons for hand-held spring or air guns
    • F42B6/04Archery arrows
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S102/00Ammunition and explosives
    • Y10S102/703Flechette

Abstract

A projectile adapted to curl and tumble on impact with a target, and having a long cylindrical shank section with a concave tapered blunt nose and rear stabilizing fins.

Description

ite States Barr atent 1 CONCAVE-COMPOUND POINTED FINNED PROJECTILE [75] Inventor: Irwin R. Barr, Lutherville, Md. [73] Assignee: AAI Corporation, Cockeysville, Md.
[22] Filed: Dec. 30, 1966 [21] AppI. No.1 606,453
[52] U.S. Cl l02/92.l, 102/D1G. 7 [51] Int. Cl. F4lb 13/00 [58] Field of Search 102/38, 42, 91, 52, 53,
[56] References Cited UNITED STATES PATENTS 213,083 3/1879 Wright et a1 273/1065 5] .Ian. 21, 1975 2,288,562 6/1942 Birkhofcr et a1 273/1065 FOREIGN PATENTS OR APPLICATIONS 619,192 3/1949 Great Britain 1. 273/1065 Primary ExaminerVerlin R. Pendegrass Attorney, Agent, or FirmRegina1ld F. Pippin, Jr.
[57] ABSTRACT A projectile adapted to curl and tumble on impact with a target, and having a long cylindrical shank section with a concave tapered blunt nose and rear stabilizing fins.
4 Claims, 6 Drawing Figures IPATENTEDJANZI m5 3861.314
Fig. 5
I RW l N R. BARR INVENTOR ATTORNEY CONCAVE-COMPOUND POINTED FINNED PROJECTILE This invention relates to fin-stabilized projectiles and is particularly applicable to small needle-like finned projectiles commonly referred to as flechettes or flechette projectiles.
Flechette projectiles such as shown in U.S. Pat. No. 2,939,395 are highly advantageous in their ability to travel long distances at high velocities, with good accuracy. For maximum effectiveness after impact as an antipersonnel weapon it is desirable that these flechettes be stable along their air flight path and curl and tumble upon impact with a soft, dense target. This tumbling action occurs at a certain minimum velocity. While projectiles will tumble to some degree if the velocity is sufficiently great at impact, it is desirable that the required or critical impact tumbling velocity be as low as possible. This invention aids in decreasing the required target impact velocity for a finned projectile to tumble within an effective travel of one or two projectile lengths after impact.
Tumbling action may be caused by a pitching moment applied at the nose of the projectile, which is of sufficient magnitude that it cannot be balanced by the fins, or which causes the projectile to bend or curl so that the fins are no longer operative in the new medium. Although a tin-stabilized projectile is stable during air flight, by weakening the nose section through formation in a desired concave shape according to the invention, the projectile is given an increased capability of bending and producing an unbalancing pitching moment after impact on striking a denser medium such as an animal. The concave shape of the nose section reduces the strength at the point where the highest loads are applied and deforms the point causing a high pitching moment and resulting in tumbling of the entire projectile at a lower velocity than with a conventionalnosed fin-stabilized projectile.
It is accordingly a major feature of the present invention to provide an improved projectile in the form of a flechette which is capable of a reasonable accuracy in flight but which will tumble in a desired manner on impact at a relatively lower velocity with a higher density target and is capable of reasonable handling in assembly without point deformation.
It is also a feature of this invention to provide a finstabilized projectile with a small blunt end having a lowered impact tumbling velocity. While flechettes having a needle sharp pointed configuration can produce low velocity impact tumbling action, such configurations are difficult to handle in assembly, etc., without damage and consequent deterioration of air flight performance characteristics. The long concave point can accomplish the same action although the very tip has a small blunt face rather than a perfect point. With the present invention the projectile may have a blunt nose end diameter of as much as .1 caliber (the body diameter of the flechette being defined as one caliber).
Still other objects, features and attendant advantages will become apparent to those skilled in the art from a reading of the following detailed description of a single embodiment constructed in accordance with the invention, taken in conjunction with the accompanying drawings wherein:
FIG. 1 is a perspective view of a flechette according to the invention,
13 with a tail section 15 having stabilizing fins 15a formed thereon as by swaging of the metal from the cylindrical body section into the configuration as indicated in FIG. 1. The forward end of the projectile has a concave compound angle point 117, formed by two adjoining frusto-conical surfaces 17a: and 17b. The frustoconical section 17a is formed with a greater included angle A than the included angle B formed by the surface of frusto-conical section 171). It has been found that a very advantageous construction of the invention, which provides good flight accuracy, with good handling characteristics and desired tumbling action, is attained with a projectile as illustrated in FIGS. l-3 in which the dimensions, material and treatment are as follows:
Total length of flechette 1.6 1.7 inches Included angle A 10 12 Included angle B S 7 Tip diameter C Cylindrical body diameter D X ll 11 11 ll 11 11 Best results have been obtained with an included angle A of 10 and included angle B of 6, the preferred tip diameter C being 0.004 0.005 inches, cylindrical body diameter D 0.070 inches, total length of flechette 1.67 inches, and X being 0.1 1 inches, this being particularly most advantageous for employment in cartridge casings of .22 caliber ammunition employing the flechette and sabot arrangement of U.S. Pat. No. 2,939,395.
In operation, the projectile is propelled by a suitable means, such as through initial gas pressure propulsion while carried in a barrel by a sabot as in U.S. Pat. No. 2,939,395, which sabot may be stripped from the projectile as by a stripper as shown in U.S. Pat. No. 2,811,901. Upon impact with a target, the concave nose section 17 will bend, first along the weakest tapered section 17b, causing a high pitching moment to. be applied to the nose of the projectile. This introduces a tumbling action and causes additional bending of the projectile to a generally curled configuration such as the configurations indicated schematically in FIGS. 4-6. The finned section may in some instances break loose from the remaining body portion, as generally illustrated in FIG. 6. The tumbling action transmits much more of the energy of the projectile to the target. Without tumbling, the projected area of the crosssectional envelopes of the projectile transmits the energy to the target. With tumbling, the side projected area with flechettes of for instance a 10:1 length/crosssectional envelope transmits over ten times the energy over the same distance. The tumbling projectile will thereby effect considerably more damage to a relatively soft and thick target, such as an animal, than would otherwise be effected by passage of the projectile thereinto or therethrough in the straight elongated form.
While the invention has been described with respect to a preferred physical embodiment, it will be readily apparent to those skilled in the art that various modifications and improvements may be made without departing from the scope or spirit of the invention. Accordingly, the invention is not to be limited by the specific illustrative embodiment, but only by the scope of the appended claims.
That which is claimed is:
1. A one piece projectile adapted to curl and tumble on impact with a target, comprising: a long cylindrical shank section, a blunt nosed concave tapered forward end section integral with and materially shorter than said shank section, and a rear section integral with said shank section and having integral stabilizing fins formed thereon.
2. A projectile according to claim 1, said concave tapered forward end section having a substantially flat tip end and being formed with two distinct adjoining tapered frusto-conical surfaces having an annular junction line between said cylindrical shank section and said flat tip end, the forwardmost of said frusto-conical surfaces forming a smaller longitudinally extending included angle between its diametral surfaces than the other said frusto-conical surface and being substantially shorter than the other frusto-conical surface.
3. A projectile according to claim 2, said smaller longitudinally included angle formed by said forwardmost frusto-conical surface being in the range of approximately 5-7, said other adjoining rearward frustoconical surface longitudinally included angle being in the range of approximately 10-12 the ratio of said forwardmost frusto-conical surface length to the other adjoining frusto-conical surface length being about 13, and the ratio of the length of said shank and tail sections to the length of said forward end concave section being at least 3-1, with a total length to shank diameter ratio of at least 15-1.
4. A flechette projectile according to claim 3,
said projectile length being approximately 1.65
inches,
said forwardmost included angle of taper being approximately 10,
the included angle of the other said tapered surface being approximately 6,
the tip end being flat and of a diameter of approximately 0.005 inches,
the cylindrical shank diameter being approximately 0.070 inches, the axial length of the forwardmost frusto-conical surface section being approximately 0.1 1 inches, and the projectile hardness being between R 40 and

Claims (4)

1. A one piece projectile adapted to curl and tumble on impact with a target, comprising: a long cylindrical shank section, a blunt nosed concave tapered forward end section integral with and materially shorter than said shank section, and a rear section integral with said shank section and having integral stabilizing fins formed thereon.
2. A projectile according to claim 1, said concave tapered forward end section having a substantially flat tip end and being formed with two distinct adjoining tapered frusto-conical surfaces having an annular junction line between said cylindrical shank section and said flat tip end, the forwardmost of said frusto-conical surfaces forming a smaller longitudinally extending included angle between its diametral surfaces than the other said frusto-conical surface and being substantially shorter than the other frusto-conical surface.
3. A projectile according to claim 2, said smaller longitudinally included angle formed by said forwardmost frusto-conical surface being in the range of approximately 5-7*, said other adjoining rearward frusto-conical surface longitudinally included angle being in the range of approximately 10-12 *, the ratio of said forwardmost frusto-conical surface length to the other adjoining frusto-conical surface length being about 1-3, and the ratio of the length of said shank and tail sections to the length of said forward end concave section being at least 3-1, with a total length to shank diameter ratio of at least 15-1.
4. A flechette projectile according to claim 3, said projectile length being approximately 1.65 inches, said forwardmost included angle of taper being approximately 10*, the included angle of the other said tapered surface being approximately 6*, the tip end being flat and of a diameter of approximately 0.005 inches, the cylindrical shank diameter being approximately 0.070 inches, the axial length of the forwardmost frusto-conical surface section being approximately 0.11 inches, and the projectile hardness being between Rc 40 and Rc 50.
US60645366 1966-12-30 1966-12-30 Concave-compound pointed finned projectile Expired - Lifetime US3861314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US60645366 US3861314A (en) 1966-12-30 1966-12-30 Concave-compound pointed finned projectile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US60645366 US3861314A (en) 1966-12-30 1966-12-30 Concave-compound pointed finned projectile

Publications (1)

Publication Number Publication Date
US3861314A true US3861314A (en) 1975-01-21

Family

ID=24428047

Family Applications (1)

Application Number Title Priority Date Filing Date
US60645366 Expired - Lifetime US3861314A (en) 1966-12-30 1966-12-30 Concave-compound pointed finned projectile

Country Status (1)

Country Link
US (1) US3861314A (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4637313A (en) * 1981-01-05 1987-01-20 Avco Corporation Earth penetrator
WO1988000325A1 (en) * 1986-06-30 1988-01-14 Davis Thomas O Jr Article using shape-memory alloy to improve and/or control the speed of recovery
US4839479A (en) * 1986-06-30 1989-06-13 Davis Jr Thomas O Article using shape-memory alloy to improve and/or control the speed of recovery
US20040055500A1 (en) * 2001-06-04 2004-03-25 Lloyd Richard M. Warhead with aligned projectiles
US20040055498A1 (en) * 2002-08-29 2004-03-25 Lloyd Richard M. Kinetic energy rod warhead deployment system
US20040129162A1 (en) * 2002-08-29 2004-07-08 Lloyd Richard M. Kinetic energy rod warhead with imploding charge for isotropic firing of the penetrators
US20040200380A1 (en) * 2001-08-23 2004-10-14 Lloyd Richard M. Kinetic energy rod warhead with lower deployment angles
US20050109234A1 (en) * 2001-08-23 2005-05-26 Lloyd Richard M. Kinetic energy rod warhead with lower deployment angles
US20050115450A1 (en) * 2003-10-31 2005-06-02 Lloyd Richard M. Vehicle-borne system and method for countering an incoming threat
US20050126421A1 (en) * 2002-08-29 2005-06-16 Lloyd Richard M. Tandem warhead
US20050132923A1 (en) * 2002-08-29 2005-06-23 Lloyd Richard M. Fixed deployed net for hit-to-kill vehicle
US20060021538A1 (en) * 2002-08-29 2006-02-02 Lloyd Richard M Kinetic energy rod warhead deployment system
US20060086279A1 (en) * 2001-08-23 2006-04-27 Lloyd Richard M Kinetic energy rod warhead with lower deployment angles
US20060112847A1 (en) * 2004-11-29 2006-06-01 Lloyd Richard M Wide area dispersal warhead
WO2005099362A3 (en) * 2003-10-14 2006-11-30 Raytheon Co Mine counter measure system
US20060283348A1 (en) * 2001-08-23 2006-12-21 Lloyd Richard M Kinetic energy rod warhead with self-aligning penetrators
US20070084376A1 (en) * 2001-08-23 2007-04-19 Lloyd Richard M Kinetic energy rod warhead with aiming mechanism
US20090205529A1 (en) * 2001-08-23 2009-08-20 Lloyd Richard M Kinetic energy rod warhead with lower deployment angles
US7624683B2 (en) 2001-08-23 2009-12-01 Raytheon Company Kinetic energy rod warhead with projectile spacing
US8418623B2 (en) 2010-04-02 2013-04-16 Raytheon Company Multi-point time spacing kinetic energy rod warhead and system
US10209043B2 (en) * 2016-11-28 2019-02-19 Elgie A. Morris Morris 80 plastic shark bolt
US10782108B1 (en) * 2019-03-18 2020-09-22 Elgie A Morris Morris 80 plastic shark fletch unit
US10845170B2 (en) * 2019-03-12 2020-11-24 Elgie Allen Morris Morris 80 plastic tour bolt
US11022412B2 (en) * 2019-03-16 2021-06-01 Elgie Allen Morris Morris 80 plastic apollo bolt

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US213083A (en) * 1879-03-11 Improvement in bows and arrows
US2288562A (en) * 1941-05-17 1942-06-30 Kroydon Company Arrow shaft construction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US213083A (en) * 1879-03-11 Improvement in bows and arrows
US2288562A (en) * 1941-05-17 1942-06-30 Kroydon Company Arrow shaft construction

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4637313A (en) * 1981-01-05 1987-01-20 Avco Corporation Earth penetrator
WO1988000325A1 (en) * 1986-06-30 1988-01-14 Davis Thomas O Jr Article using shape-memory alloy to improve and/or control the speed of recovery
US4759293A (en) * 1986-06-30 1988-07-26 Davis Jr Thomas O Article using shape-memory alloy to improve and/or control the speed of recovery
US4839479A (en) * 1986-06-30 1989-06-13 Davis Jr Thomas O Article using shape-memory alloy to improve and/or control the speed of recovery
US6973878B2 (en) 2001-06-04 2005-12-13 Raytheon Company Warhead with aligned projectiles
US20040055500A1 (en) * 2001-06-04 2004-03-25 Lloyd Richard M. Warhead with aligned projectiles
US20040200380A1 (en) * 2001-08-23 2004-10-14 Lloyd Richard M. Kinetic energy rod warhead with lower deployment angles
US20060283348A1 (en) * 2001-08-23 2006-12-21 Lloyd Richard M Kinetic energy rod warhead with self-aligning penetrators
US20050109234A1 (en) * 2001-08-23 2005-05-26 Lloyd Richard M. Kinetic energy rod warhead with lower deployment angles
US8127686B2 (en) 2001-08-23 2012-03-06 Raytheon Company Kinetic energy rod warhead with aiming mechanism
US7621222B2 (en) 2001-08-23 2009-11-24 Raytheon Company Kinetic energy rod warhead with lower deployment angles
US20070084376A1 (en) * 2001-08-23 2007-04-19 Lloyd Richard M Kinetic energy rod warhead with aiming mechanism
US7624683B2 (en) 2001-08-23 2009-12-01 Raytheon Company Kinetic energy rod warhead with projectile spacing
US7624682B2 (en) 2001-08-23 2009-12-01 Raytheon Company Kinetic energy rod warhead with lower deployment angles
US20060086279A1 (en) * 2001-08-23 2006-04-27 Lloyd Richard M Kinetic energy rod warhead with lower deployment angles
US20090205529A1 (en) * 2001-08-23 2009-08-20 Lloyd Richard M Kinetic energy rod warhead with lower deployment angles
US7017496B2 (en) 2002-08-29 2006-03-28 Raytheon Company Kinetic energy rod warhead with imploding charge for isotropic firing of the penetrators
US20060021538A1 (en) * 2002-08-29 2006-02-02 Lloyd Richard M Kinetic energy rod warhead deployment system
US6931994B2 (en) 2002-08-29 2005-08-23 Raytheon Company Tandem warhead
US20060112817A1 (en) * 2002-08-29 2006-06-01 Lloyd Richard M Fixed deployed net for hit-to-kill vehicle
US20050132923A1 (en) * 2002-08-29 2005-06-23 Lloyd Richard M. Fixed deployed net for hit-to-kill vehicle
US20050126421A1 (en) * 2002-08-29 2005-06-16 Lloyd Richard M. Tandem warhead
US7143698B2 (en) 2002-08-29 2006-12-05 Raytheon Company Tandem warhead
US20040129162A1 (en) * 2002-08-29 2004-07-08 Lloyd Richard M. Kinetic energy rod warhead with imploding charge for isotropic firing of the penetrators
US20040055498A1 (en) * 2002-08-29 2004-03-25 Lloyd Richard M. Kinetic energy rod warhead deployment system
US7412916B2 (en) 2002-08-29 2008-08-19 Raytheon Company Fixed deployed net for hit-to-kill vehicle
US7415917B2 (en) 2002-08-29 2008-08-26 Raytheon Company Fixed deployed net for hit-to-kill vehicle
US20090223404A1 (en) * 2002-08-29 2009-09-10 Lloyd Richard M Fixed deployed net for hit-to-kill vehicle
US20060162604A1 (en) * 2002-08-29 2006-07-27 Lloyd Richard M Tandem warhead
WO2005099362A3 (en) * 2003-10-14 2006-11-30 Raytheon Co Mine counter measure system
US7726244B1 (en) 2003-10-14 2010-06-01 Raytheon Company Mine counter measure system
US6920827B2 (en) 2003-10-31 2005-07-26 Raytheon Company Vehicle-borne system and method for countering an incoming threat
US20050115450A1 (en) * 2003-10-31 2005-06-02 Lloyd Richard M. Vehicle-borne system and method for countering an incoming threat
US20060112847A1 (en) * 2004-11-29 2006-06-01 Lloyd Richard M Wide area dispersal warhead
US7717042B2 (en) 2004-11-29 2010-05-18 Raytheon Company Wide area dispersal warhead
US8418623B2 (en) 2010-04-02 2013-04-16 Raytheon Company Multi-point time spacing kinetic energy rod warhead and system
US10209043B2 (en) * 2016-11-28 2019-02-19 Elgie A. Morris Morris 80 plastic shark bolt
US10845170B2 (en) * 2019-03-12 2020-11-24 Elgie Allen Morris Morris 80 plastic tour bolt
US11022412B2 (en) * 2019-03-16 2021-06-01 Elgie Allen Morris Morris 80 plastic apollo bolt
US10782108B1 (en) * 2019-03-18 2020-09-22 Elgie A Morris Morris 80 plastic shark fletch unit

Similar Documents

Publication Publication Date Title
US3861314A (en) Concave-compound pointed finned projectile
US3434425A (en) Underwater projectile
US3851590A (en) Multiple hardness pointed finned projectile
US3545383A (en) Flechette
US3138102A (en) Shotgun projectile having slits
US3915092A (en) Underwater projectile
US5339743A (en) Ammunition system comprising slug holding sabot and slug type shot shell
US3902424A (en) Projectile
US5515787A (en) Tubular projectile
US6105506A (en) Sabot slug for shotgun
US4671181A (en) Anti-tank shell
US3846878A (en) Method of making an underwater projectile
USH1938H1 (en) Supercavitating water-entry projectile
US2838000A (en) Projectile and method of making the same
US3762332A (en) Projectile sabot
US10352669B2 (en) Advanced aerodynamic projectile and method of making same
US4612860A (en) Projectile
US4075946A (en) Armor piercing projectile
US4936218A (en) Projectile
US5325786A (en) Flechette for a shotgun
US2324346A (en) Projectile for firearms
US4209146A (en) Device for extensible fin blade on shell or the like
US3939773A (en) Spin-stabilized projectiles
US3662686A (en) Rod and sabot assembly
US5801324A (en) Dividing bullet having longitudinally joined jacketed projectile segments that separate upon target impact