US20060011089A1 - Paintball having reduced drag - Google Patents
Paintball having reduced drag Download PDFInfo
- Publication number
- US20060011089A1 US20060011089A1 US11/156,146 US15614605A US2006011089A1 US 20060011089 A1 US20060011089 A1 US 20060011089A1 US 15614605 A US15614605 A US 15614605A US 2006011089 A1 US2006011089 A1 US 2006011089A1
- Authority
- US
- United States
- Prior art keywords
- paintball
- accordance
- dodecahedron
- faces
- polyhedron
- 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.)
- Abandoned
Links
Images
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
- F42B10/32—Range-reducing or range-increasing arrangements; Fall-retarding means
- F42B10/38—Range-increasing arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
- F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
- F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
- F42B12/40—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information of target-marking, i.e. impact-indicating type
Definitions
- the present invention relates to aerodynamic spheroids; more particularly, to paintballs for use in hunting sport games; and most particularly, to an improved paintball having a polyhedral outer surface for reduced drag and greater range.
- paintballs are an integral element of a well-known mock hunting sport wherein players attempt to deliver paintballs into rupturing contact with other players. See, for example, U.S. Pat. Nos. 5,001,880; 5,018,450; 5,393,054; 5,353,712; 5,448,951; 5,640,945; 5,762,058; 5,823,173; 5,936,190; 6,082,439; 6,145,441; 6,230,630; 6,375,981; 6,530,962; 6,574,945; and 6,615,739, the relevant disclosures of which are hereby incorporated by reference.
- War Games The sport or recreational activity known as “War Games” is currently one of the fastest growing sports in North America. Typically, players are arranged into two or more teams and shoot paintballs at members of the opposing teams in a hide-and-seek setting. When a paintball strikes a player of an opposing team, the paintball ruptures and releases the fill material or “paint” onto that player. Any player who has been struck by a paintball is marked and thus disqualified from continuing in the game.
- a paintball comprises a generally spherical capsule having a typical thickness of about 0.010 inch and enclosing a charge of a colored liquid, referred to generally as “paint.”
- the paint while typically liquid in most paintballs today, may be in any phase.
- the current invention is not limited to liquid fill materials, or to single-phase fill materials.
- the capsule is formed of gelatin and the paint is a dyed aqueous sugar solution that may include additives such as starch and polyethylene glycol to improve breakage resistance in handling and firing.
- a paintball In the sport, a paintball typically is fired from a hand-held gun employing a compressed-gas charge which can accelerate the paintball without causing it to rupture within the gun.
- the discharge velocity of a paintball In organized paintball activities, the discharge velocity of a paintball is limited to 300 feet per second; at higher paintball velocities, human injury can result.
- a typical paintball gun can discharge a paintball at about 298 feet per second.
- the limit on initial muzzle velocity creates a resulting limit in range of fire of a regulation paintball from a regulation gun.
- the flight of a paintball is typically ballistic, following paraboloid path dictated by gravitational acceleration in the vertical direction and muzzle velocity in the horizontal direction.
- the path is not ideally parabolic, however, because a projectile is subject to both frictional drag forces and form drag forces in the horizontal direction, causing a progressive reduction in velocity during the flight.
- the practical result is that the range of a paintball is significantly less than theoretical, typically only about one-tenth the ideal range in the absence of drag. A greater range from the same initial velocity is highly desirable.
- a paintball in accordance with the invention comprises a thin-walled capsule filled with paint, wherein the surface of the capsule is formed as a polyhedron, for example, a dodecahedron.
- the angled surface faces of the polyhedron cause turbulent air flow over a greater percentage of the paintball surface than in a prior art smooth, spherical paintball. The air flow thus remains “attached” over more of the paintball surface, thereby reducing form drag of the paintball.
- a paintball formed in accordance with the invention includes a plurality of interfacial edges which are currently believed to be preferred lines of impact breakage of the paintball.
- the manufacturing processes used to create the paintball also may be used to induce false mold markings along the interfacial edges, such that the parting line from the manufacturing process does not introduce asymmetry into the paintball shape.
- the edges may be preferentially raised, or indented, to control the impact breakage characteristics and the deformable body characteristics of the ball during firing and flight.
- FIG. 1 is an isometric view of a paintball in accordance with the invention having an outer surface in the form of a regular dodecahedron;
- FIG. 2 is a wire-frame perspective view of a paintball similar to the one shown in FIG. 1 illustrating a concave face, a convex face, and a septa positioned within the paintball chamber forming first and second sub-chambers;
- FIG. 3 is a wire-frame perspective view of a paintball having a buckyball shape
- FIG. 4 is a wire-frame perspective view of a paintball having a triacontahedron shape
- FIG. 5 is a wire-frame perspective view of a paintball having a pentagonal dodecahedron shape
- FIG. 6 is a wire-frame perspective view of a paintball having a icosahedron shape
- FIG. 7 is a wire-frame perspective view of a paintball having a hexakisoctahedron shape
- FIG. 8 is a wire-frame perspective view of a paintball having a triakisoctahedron shape
- FIG. 9 is a wire-frame perspective view of a paintball having a icositetrahedron shape
- FIG. 10 is a wire-frame perspective view of a paintball having a octahedron shape
- FIG. 11 is a wire-frame perspective view of a paintball having a cube shape
- FIG. 12 is a wire-frame perspective view of a paintball having a hexakistetrahedron shape
- FIG. 13 is a wire-frame perspective view of a paintball having a tetrahedron shape
- FIG. 14 is a wire-frame perspective view of a paintball having a deltoid dodecahedron shape
- FIG. 15 is a wire-frame perspective view of a paintball having a diakisdodecahedron shape
- FIG. 16 is a wire-frame perspective view of a paintball having a pentagonal icositetrahedron shape
- FIG. 17 is a wire-frame perspective view of a paintball having a tetrahedral pentagonal dodecahedron shape
- FIG. 18 is a wire-frame perspective view of a paintball having a deltoid dodecahedron shape
- FIG. 19 is a wire-frame perspective view of a paintball having a trigonal dipyramid shape
- FIG. 20 is a wire-frame perspective view of a paintball having a tetragonal dipyramid shape
- FIG. 21 is a wire-frame perspective view of a paintball having a rhombohedron shape.
- FIG. 22 is a graphical representation of drag coefficients (CD) for three-dimensional ellipsoidal bodies of revolution as a function of aspect ratio.
- paintball 10 in accordance with the invention includes a semi-rigid capsule shell 12 defining a closed chamber 13 for enclosing a liquid charge of paint (not visible in FIGS. 1 and 2 ).
- Shell 12 is formed in a generally spheroid shape defining a closed polyhedron on at least the outer surface of shell 12 , the polyhedron comprising faces 14 intersecting at interfacial edges 16 .
- Faces 14 may be planar, convex outwards 14 a, or concave outwards 14 b, or combinations thereof. While one of the faces 14 of paintball 10 in FIG.
- faces 14 are shown as convex outward 14 a, and one of faces 14 is shown as concave outward 14 b, it will be understood that more than one of faces 14 may be either convex outward 14 a or concave outward 14 b. This includes an embodiment where all of faces 14 on paintball 10 are either convex outward 14 a or concave outward 14 b. Moreover, faces 14 may be identical or non-identical.
- a currently-preferred polyhedron is a regular dodecahedron, as shown in FIGS. 1 and 2 , although other closed polyhedra are fully comprehended by the invention.
- the invention all includes, but is not limited to, polyhedra such as a buckyball 10 a , triacontahedron 10 b, pentagonal dodecahedron 10 c, icosahedron 10 d, hexakisoctahedron 10 e, triakisoctahedron 10 f, icositetrahedron 10 g, octahedron 10 h, cube 10 i, hexakistetrahedron 10 j, tetrahedron 10 k, deltoid dodecahedron 10 l, diakisdodecahedron 10 m, pentagonal icositetrahedron 10 n, tetrahedral pentagonal dodecahedron 10 c, de
- interfacial edges 16 are currently believed to be preferred lines of impact breakage of the paintball.
- the manufacturing processes used to create paintball 10 also may be used to induce false mold markings 18 along one or more of interfacial edges 16 , such that the parting line from the manufacturing process does not introduce asymmetry into the paintball shape. It will be understood that false mold markings 18 may extend generally around the circumference of paintball 10 along one or more of interfacial edges 16 .
- interfacial edges 16 may be preferentially raised, or indented, to control the impact breakage characteristics and the deformable body characteristics of paintball 10 during firing and flight.
- Paintball 10 may include a plurality of similar or dissimilar liquid or other material charges within the closed chamber of shell 12 which may be separated internally by one or more septa 20 that divide the chamber into at least first and second sub-chambers 13 a, 13 b as best seen in FIG. 2 .
- the one or more septa 20 are intended to rupture at impact, along with shell 12 , thereby mixing the liquid charges.
- the internal septa 20 can also cause the liquid charges to rotate with the shell, preventing paintball rotation from being viscously damped out, as disclosed in U.S. Pat. No. 5,640,945.
- a currently-preferred polyhedral shaped shell can reduce form drag on a paintball by between 25% and 50% as compared to an unfeatured, spherical paintball of otherwise identical weight, size, and composition.
- FIG. 22 is a graphical representation of the data presented in Table 1.
- the drag coefficient is dramatically reduced by causing a transition from laminar to turbulent flow.
- slightly increasing the aspect ratio of the projectile such that it is somewhat elongated in the direction of motion, causes a reduction in total drag on the body.
- the aspect ratio is increased too far, then the overall drag begins to increase again, and skin friction affects overtake the importance of the pressure recovery.
- CD total drag coefficient
- elongating the projectile to an aspect ratio of 1.1:1 reduces the drag coefficient by approximately 5%.
- the drag coefficient CD can be reduced by approximately 11%. Even better reductions in drag coefficient are achieved for a given deformation when the flow is in the turbulent range.
- a paintball that can cause the boundary layer flow to transition from laminar flow to turbulent flow will have a decreased drag coefficient, C D , and a corresponding increase in range for a given muzzle velocity.
- a projectile which is deformed into an oblong shape will have a lower drag coefficient, C D , and a corresponding increase in range for a given muzzle velocity than a projectile which is generally spherical in shape.
- C D drag coefficient
- TABLE 2 Estimated drag coefficients for three-dimensional ellipsoidal bodies of revolution of various aspect ratios, obtained by linear interpolation of the data presented in Table 1.
- Approximate % Approximate % Ellipsoidal Aspect Approximate Approximate Reduction in Reduction in Shape Ratio Laminar C D Turbulent C D Laminar C D Turbulent C D 1:1 0.47 0.27 Not Applicable Not Applicable 1.11:1 0.45 0.25 5% 9% 1.25:1 0.42 0.22 11% 19% 1.43:1 0.38 0.18 18% 33% 1.67:1 0.34 0.13 29% 52% 2:1 0.27 0.06 43% 78%
- a paintball projectile that is generally spheroidal in shape during the process of storage, transportation, and loading from the paintball feeder into the breech of a paintball gun.
- the generally spheroid shape has numerous materials handling advantages, including the primary advantages of being able to load the projectile into the gun without need to orient the projectile in a particular fashion, and for compatibility with the large installed user-base of paintball guns which have the ability to manipulate and fire only those projectiles that are generally spheroid.
- a paintball which can be initially fired in a generally spheroid shape, and can be caused to deform into an elongated aspect ratio as illustrated in Table 2 during the process of firing the paintball from the gun or during its flight from the muzzle to the target, can exhibit reduced total drag coefficient, C D , and hence improved range.
- the present invention meets these needs.
Abstract
A paintball comprising a thin-walled capsule filled with paint, wherein the surface of the capsule is formed as a polyhedron, for example, a dodecahedron. The angled surface faces of the polyhedron cause turbulent air flow over a greater percentage of the paintball surface than in a prior art smooth, spherical paintball. The air flow thus remains “attached” over more of the paintball surface, thereby reducing form drag of the paintball. An added benefit of a paintball formed in accordance with the invention is that the structure includes a plurality of intrafacial edges which are currently believed to be preferred lines of impact breakage of the paintball.
Description
- This application claims the benefit of U.S. Provisional Application No. 60/580,608, filed Jun. 17, 2004
- The present invention relates to aerodynamic spheroids; more particularly, to paintballs for use in hunting sport games; and most particularly, to an improved paintball having a polyhedral outer surface for reduced drag and greater range.
- So-called “paintballs” are an integral element of a well-known mock hunting sport wherein players attempt to deliver paintballs into rupturing contact with other players. See, for example, U.S. Pat. Nos. 5,001,880; 5,018,450; 5,393,054; 5,353,712; 5,448,951; 5,640,945; 5,762,058; 5,823,173; 5,936,190; 6,082,439; 6,145,441; 6,230,630; 6,375,981; 6,530,962; 6,574,945; and 6,615,739, the relevant disclosures of which are hereby incorporated by reference.
- The sport or recreational activity known as “War Games” is currently one of the fastest growing sports in North America. Typically, players are arranged into two or more teams and shoot paintballs at members of the opposing teams in a hide-and-seek setting. When a paintball strikes a player of an opposing team, the paintball ruptures and releases the fill material or “paint” onto that player. Any player who has been struck by a paintball is marked and thus disqualified from continuing in the game.
- A paintball comprises a generally spherical capsule having a typical thickness of about 0.010 inch and enclosing a charge of a colored liquid, referred to generally as “paint.” The paint, while typically liquid in most paintballs today, may be in any phase. The current invention is not limited to liquid fill materials, or to single-phase fill materials. Typically, the capsule is formed of gelatin and the paint is a dyed aqueous sugar solution that may include additives such as starch and polyethylene glycol to improve breakage resistance in handling and firing.
- In the sport, a paintball typically is fired from a hand-held gun employing a compressed-gas charge which can accelerate the paintball without causing it to rupture within the gun. In organized paintball activities, the discharge velocity of a paintball is limited to 300 feet per second; at higher paintball velocities, human injury can result. Thus, a typical paintball gun can discharge a paintball at about 298 feet per second.
- The limit on initial muzzle velocity creates a resulting limit in range of fire of a regulation paintball from a regulation gun.
- The flight of a paintball is typically ballistic, following paraboloid path dictated by gravitational acceleration in the vertical direction and muzzle velocity in the horizontal direction. The path is not ideally parabolic, however, because a projectile is subject to both frictional drag forces and form drag forces in the horizontal direction, causing a progressive reduction in velocity during the flight. The practical result is that the range of a paintball is significantly less than theoretical, typically only about one-tenth the ideal range in the absence of drag. A greater range from the same initial velocity is highly desirable.
- What is needed in the art is a means for increasing the range of a paintball within the initial velocity limitations of the sport.
- It is a principal object of the present invention to provide an improved paintball that can travel farther than prior art paintballs.
- Briefly described, a paintball in accordance with the invention comprises a thin-walled capsule filled with paint, wherein the surface of the capsule is formed as a polyhedron, for example, a dodecahedron. The angled surface faces of the polyhedron cause turbulent air flow over a greater percentage of the paintball surface than in a prior art smooth, spherical paintball. The air flow thus remains “attached” over more of the paintball surface, thereby reducing form drag of the paintball.
- An added benefit of a paintball formed in accordance with the invention is that the structure includes a plurality of interfacial edges which are currently believed to be preferred lines of impact breakage of the paintball. The manufacturing processes used to create the paintball also may be used to induce false mold markings along the interfacial edges, such that the parting line from the manufacturing process does not introduce asymmetry into the paintball shape. Further, the edges may be preferentially raised, or indented, to control the impact breakage characteristics and the deformable body characteristics of the ball during firing and flight.
- The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
-
FIG. 1 is an isometric view of a paintball in accordance with the invention having an outer surface in the form of a regular dodecahedron; -
FIG. 2 is a wire-frame perspective view of a paintball similar to the one shown inFIG. 1 illustrating a concave face, a convex face, and a septa positioned within the paintball chamber forming first and second sub-chambers; -
FIG. 3 is a wire-frame perspective view of a paintball having a buckyball shape; -
FIG. 4 is a wire-frame perspective view of a paintball having a triacontahedron shape; -
FIG. 5 is a wire-frame perspective view of a paintball having a pentagonal dodecahedron shape; -
FIG. 6 is a wire-frame perspective view of a paintball having a icosahedron shape; -
FIG. 7 is a wire-frame perspective view of a paintball having a hexakisoctahedron shape; -
FIG. 8 is a wire-frame perspective view of a paintball having a triakisoctahedron shape; -
FIG. 9 is a wire-frame perspective view of a paintball having a icositetrahedron shape; -
FIG. 10 is a wire-frame perspective view of a paintball having a octahedron shape; -
FIG. 11 is a wire-frame perspective view of a paintball having a cube shape; -
FIG. 12 is a wire-frame perspective view of a paintball having a hexakistetrahedron shape; -
FIG. 13 is a wire-frame perspective view of a paintball having a tetrahedron shape; -
FIG. 14 is a wire-frame perspective view of a paintball having a deltoid dodecahedron shape; -
FIG. 15 is a wire-frame perspective view of a paintball having a diakisdodecahedron shape; -
FIG. 16 is a wire-frame perspective view of a paintball having a pentagonal icositetrahedron shape; -
FIG. 17 is a wire-frame perspective view of a paintball having a tetrahedral pentagonal dodecahedron shape; -
FIG. 18 is a wire-frame perspective view of a paintball having a deltoid dodecahedron shape; -
FIG. 19 is a wire-frame perspective view of a paintball having a trigonal dipyramid shape; -
FIG. 20 is a wire-frame perspective view of a paintball having a tetragonal dipyramid shape; -
FIG. 21 is a wire-frame perspective view of a paintball having a rhombohedron shape; and -
FIG. 22 is a graphical representation of drag coefficients (CD) for three-dimensional ellipsoidal bodies of revolution as a function of aspect ratio. - Referring to
FIGS. 1 and 2 ,paintball 10 in accordance with the invention includes asemi-rigid capsule shell 12 defining a closedchamber 13 for enclosing a liquid charge of paint (not visible inFIGS. 1 and 2 ).Shell 12 is formed in a generally spheroid shape defining a closed polyhedron on at least the outer surface ofshell 12, thepolyhedron comprising faces 14 intersecting atinterfacial edges 16.Faces 14 may be planar, convex outwards 14 a, or concave outwards 14 b, or combinations thereof. While one of thefaces 14 ofpaintball 10 inFIG. 2 is shown as convex outward 14 a, and one offaces 14 is shown as concave outward 14 b, it will be understood that more than one offaces 14 may be either convex outward 14 a or concave outward 14 b. This includes an embodiment where all of faces 14 onpaintball 10 are either convex outward 14 a or concave outward 14 b. Moreover,faces 14 may be identical or non-identical. - A currently-preferred polyhedron is a regular dodecahedron, as shown in
FIGS. 1 and 2 , although other closed polyhedra are fully comprehended by the invention. For instance, as best seen inFIGS. 3-21 , the invention all includes, but is not limited to, polyhedra such as abuckyball 10 a, triacontahedron 10 b,pentagonal dodecahedron 10 c, icosahedron 10 d, hexakisoctahedron 10 e, triakisoctahedron 10 f, icositetrahedron 10 g,octahedron 10 h, cube 10 i, hexakistetrahedron 10 j, tetrahedron 10 k, deltoid dodecahedron 10 l, diakisdodecahedron 10 m,pentagonal icositetrahedron 10 n, tetrahedralpentagonal dodecahedron 10 c, deltoid dodecahedron 10 p, trigonal dipyramid 10 q, tetragonal dipyramid 10 r, and rhombohedron 10 s, respectively. - As best seen in
FIGS. 1 and 2 ,interfacial edges 16 are currently believed to be preferred lines of impact breakage of the paintball. The manufacturing processes used to createpaintball 10 also may be used to inducefalse mold markings 18 along one or more ofinterfacial edges 16, such that the parting line from the manufacturing process does not introduce asymmetry into the paintball shape. It will be understood thatfalse mold markings 18 may extend generally around the circumference ofpaintball 10 along one or more ofinterfacial edges 16. Further,interfacial edges 16 may be preferentially raised, or indented, to control the impact breakage characteristics and the deformable body characteristics ofpaintball 10 during firing and flight. -
Paintball 10 may include a plurality of similar or dissimilar liquid or other material charges within the closed chamber ofshell 12 which may be separated internally by one ormore septa 20 that divide the chamber into at least first and second sub-chambers 13 a, 13 b as best seen inFIG. 2 . The one ormore septa 20 are intended to rupture at impact, along withshell 12, thereby mixing the liquid charges. Theinternal septa 20 can also cause the liquid charges to rotate with the shell, preventing paintball rotation from being viscously damped out, as disclosed in U.S. Pat. No. 5,640,945. - The purpose of providing
shell 12 as a closed polyhedron is to reduce form drag, thereby promoting longer flight of a paintball so equipped. The benefits of reduced drag are well known for spherical and ellipsoidal bodies, and are equally applicable to polyhedral bodies, for the same reasons. A currently-preferred polyhedral shaped shell can reduce form drag on a paintball by between 25% and 50% as compared to an unfeatured, spherical paintball of otherwise identical weight, size, and composition.TABLE 1 Aspect Ratio Laminar Flow Turbulent Flow 1:1 0.47 0.27 2:1 0.27 0.06 4:1 0.2 0.06 8:1 0.25 0.13
Drag coefficients for three-dimensional ellipsoidal bodies of revolution. Source: Mechanics of Fluids, By Irving H. Shames, 2nd edition, © 1982, Table 10.3, Page 409, McGraw Hill, ISBN 0-07-056385-3.FIG. 22 is a graphical representation of the data presented in Table 1.
- With reference to
FIG. 22 , for a sphere, with an aspect ratio of 1:1, the drag coefficient is dramatically reduced by causing a transition from laminar to turbulent flow. In addition, whether the flow is turbulent or laminar, slightly increasing the aspect ratio of the projectile, such that it is somewhat elongated in the direction of motion, causes a reduction in total drag on the body. This is due to the fact that the streamlined flow on the trailing edge of the body results in better pressure recovery. However, if the aspect ratio is increased too far, then the overall drag begins to increase again, and skin friction affects overtake the importance of the pressure recovery. The important thing to note from the figure below is that the total drag coefficient, CD, on the projectile decreases nearly linearly with increasing aspect ratio, as the projectile becomes less spherical in shape. - The results illustrated in Table 1 and
FIG. 22 are demonstrated in Table 2 set forth below, which shows the positive influence that deforming the shape of the projectile body can have upon the drag coefficient. For a spherical shape having an aspect ratio of 1:1, which is the shape used by virtually all paintballs today, the drag coefficient, CD, is 0.47. If transition to turbulence can be induced, then the drag coefficient can be reduced dramatically to approximately 0.27. Such a reduction will result in extended range of the projectile flight. Note that whether the flow regime is laminar or turbulent, a reduction in the drag coefficient, CD, can be achieved by increasing the aspect ratio of the projectile. For example, in laminar flow conditions, elongating the projectile to an aspect ratio of 1.1:1 reduces the drag coefficient by approximately 5%. As the deformation becomes more pronounced, for example with an aspect ratio of 1.25:1 under laminar flow conditions, the drag coefficient CD can be reduced by approximately 11%. Even better reductions in drag coefficient are achieved for a given deformation when the flow is in the turbulent range. Thus, a paintball that can cause the boundary layer flow to transition from laminar flow to turbulent flow will have a decreased drag coefficient, CD, and a corresponding increase in range for a given muzzle velocity. Additionally, a projectile which is deformed into an oblong shape will have a lower drag coefficient, CD, and a corresponding increase in range for a given muzzle velocity than a projectile which is generally spherical in shape.TABLE 2 Estimated drag coefficients for three-dimensional ellipsoidal bodies of revolution of various aspect ratios, obtained by linear interpolation of the data presented in Table 1. Approximate % Approximate % Ellipsoidal Aspect Approximate Approximate Reduction in Reduction in Shape Ratio Laminar CD Turbulent CD Laminar CD Turbulent CD 1:1 0.47 0.27 Not Applicable Not Applicable 1.11:1 0.45 0.25 5% 9% 1.25:1 0.42 0.22 11% 19% 1.43:1 0.38 0.18 18% 33% 1.67:1 0.34 0.13 29% 52% 2:1 0.27 0.06 43% 78% - It is desirable to have a paintball projectile that is generally spheroidal in shape during the process of storage, transportation, and loading from the paintball feeder into the breech of a paintball gun. The generally spheroid shape has numerous materials handling advantages, including the primary advantages of being able to load the projectile into the gun without need to orient the projectile in a particular fashion, and for compatibility with the large installed user-base of paintball guns which have the ability to manipulate and fire only those projectiles that are generally spheroid. At the same time, a paintball which can be initially fired in a generally spheroid shape, and can be caused to deform into an elongated aspect ratio as illustrated in Table 2 during the process of firing the paintball from the gun or during its flight from the muzzle to the target, can exhibit reduced total drag coefficient, CD, and hence improved range. The present invention meets these needs.
- While the invention has been described by reference to various specific embodiments, it should be understood that numerous changes may be made within the spirit and scope of the inventive concepts described. Accordingly, it is intended that the invention not be limited to the described embodiments, but will have full scope defined by the language of the following claims.
Claims (13)
1. A paintball for discharge from a paintball gun, comprising:
a) a semi-rigid shell defining a closed chamber; and
b) a material charge contained within said chamber,
wherein said shell is formed in a shape defining a closed polyhedron on at least the outer surface thereof, said polyhedron comprising a plurality of faces intersecting at a plurality of interfacial edges.
2. A paintball in accordance with claim 1 wherein said faces are selected from the group consisting of planar, convex outwards, concave outwards, and combinations thereof.
3. A paintball in accordance with claim 1 wherein said plurality of faces is identical.
4. A paintball in accordance with claim 1 wherein said plurality of faces is non-identical.
5. A paintball in accordance with claim 1 wherein said polyhedron is selected from the group consisting of buckyball, triacontahedron, pentagonal dodecahedron, icosahedron, hexakisoctahedron, triakisoctahedron, icositetrahedron, octahedron, cube, hexakistetrahedron, tetrahedron, deltoid dodecahedron, diakisdodecahedron, pentagonal icositetrahedron, tetrahedral pentagonal dodecahedron, deltoid dodecahedron, trigonal dipyramid, tetragonal dipyramid, and rhombohedron.
6. A paintball in accordance with claim 1 further comprising at least one internal septum dividing said chamber into at least first and second sub-chambers.
7. A paintball in accordance with claim 6 further comprising at least first and second material charges disposed in said first and second sub-chambers, respectively.
8. A paintball in accordance with claim 7 wherein said first and second charges are identical in composition.
9. A paintball in accordance with claim 7 wherein said first and second charges are non-identical in composition.
10. A paintball in accordance with claim 1 wherein the aerodynamic form drag of said paintball is at least 25% less than the aerodynamic form drag of an unfeatured prior art paintball.
11. A paintball in accordance with claim 1 wherein the manufactured shape of said shell is aerodynamically deformable during firing and flight of said paintball from a firing means.
12. A paintball in accordance with claim 1 further comprising false molding marks on the surface thereof.
13. A paintball in accordance with claim 12 , wherein the false molding marks are positioned on the interfacial edges.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/156,146 US20060011089A1 (en) | 2004-06-17 | 2005-06-17 | Paintball having reduced drag |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US58060804P | 2004-06-17 | 2004-06-17 | |
US11/156,146 US20060011089A1 (en) | 2004-06-17 | 2005-06-17 | Paintball having reduced drag |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060011089A1 true US20060011089A1 (en) | 2006-01-19 |
Family
ID=35598081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/156,146 Abandoned US20060011089A1 (en) | 2004-06-17 | 2005-06-17 | Paintball having reduced drag |
Country Status (1)
Country | Link |
---|---|
US (1) | US20060011089A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080035006A1 (en) * | 2005-02-05 | 2008-02-14 | Ciesiun Paul M | Bioluminescent paintball |
US20080115660A1 (en) * | 2004-12-30 | 2008-05-22 | Edward Hensel | Remotely Controlled Marker For Hunting Games |
US20100083862A1 (en) * | 2005-02-05 | 2010-04-08 | Ciesiun Paul M | Water based paintall and method for fabricating water based paintballs |
Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5001880A (en) * | 1990-04-25 | 1991-03-26 | Smith Henry J | Method for producing luminescent paintballs |
US5018450A (en) * | 1990-04-25 | 1991-05-28 | Smith Henry J | Luminescent paintball for marking nighttime impacts |
US5353712A (en) * | 1991-12-31 | 1994-10-11 | Olson Christy L | Marking pellet gun and rigid, fracturable pellet therefor |
US5393054A (en) * | 1994-03-09 | 1995-02-28 | Zap Paintball Corporation | Paint ball |
US5640945A (en) * | 1995-05-04 | 1997-06-24 | Robert Slonaker | Paintball and paintball gun |
US5762058A (en) * | 1995-06-19 | 1998-06-09 | Cheng; Richard T. | Exciter for luminescent projectile |
US5823173A (en) * | 1995-05-04 | 1998-10-20 | Slonaker; Robert M. | Paintball gun |
US5936190A (en) * | 1993-06-01 | 1999-08-10 | Buzick; Steven Craig | Precision shooting aerodynamic non-spherical safety-oriented projectile |
US6082439A (en) * | 1996-11-29 | 2000-07-04 | Denso Corporation | Heat exchanger assembled without brazing in which adhesive is used to seal a combined portion and a core plate |
US6145441A (en) * | 1998-04-02 | 2000-11-14 | The United States Of America As Represented By The Secretary Of The Navy | Frangible payload-dispensing projectile |
US6230630B1 (en) * | 1999-03-10 | 2001-05-15 | Perfect Circle Paintball, Inc. | Aerodynamic projectiles and methods of making the same |
US6375981B1 (en) * | 2000-06-01 | 2002-04-23 | A. E. Staley Manufacturing Co. | Modified starch as a replacement for gelatin in soft gel films and capsules |
US6530962B1 (en) * | 2001-08-31 | 2003-03-11 | R.P. Scherer Technologies, Inc. | Emulsion of water soluble dyes in a lipophilic carrier |
US6574945B2 (en) * | 2001-03-21 | 2003-06-10 | Lumitek Llc | Method for manufacturing a projectile containing chemiluminescent compounds |
US20030158001A1 (en) * | 2002-02-21 | 2003-08-21 | Morgan William E. | Dimple patterns for golf balls |
US6905426B2 (en) * | 2002-02-15 | 2005-06-14 | Acushnet Company | Golf ball with spherical polygonal dimples |
-
2005
- 2005-06-17 US US11/156,146 patent/US20060011089A1/en not_active Abandoned
Patent Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5018450A (en) * | 1990-04-25 | 1991-05-28 | Smith Henry J | Luminescent paintball for marking nighttime impacts |
US5001880A (en) * | 1990-04-25 | 1991-03-26 | Smith Henry J | Method for producing luminescent paintballs |
US5448951A (en) * | 1991-12-31 | 1995-09-12 | Olson; Christy L. | Rigid, fracturable projectiles for air powered guns |
US5353712A (en) * | 1991-12-31 | 1994-10-11 | Olson Christy L | Marking pellet gun and rigid, fracturable pellet therefor |
US5936190A (en) * | 1993-06-01 | 1999-08-10 | Buzick; Steven Craig | Precision shooting aerodynamic non-spherical safety-oriented projectile |
US5393054A (en) * | 1994-03-09 | 1995-02-28 | Zap Paintball Corporation | Paint ball |
US5640945A (en) * | 1995-05-04 | 1997-06-24 | Robert Slonaker | Paintball and paintball gun |
US5823173A (en) * | 1995-05-04 | 1998-10-20 | Slonaker; Robert M. | Paintball gun |
US5762058A (en) * | 1995-06-19 | 1998-06-09 | Cheng; Richard T. | Exciter for luminescent projectile |
US6082439A (en) * | 1996-11-29 | 2000-07-04 | Denso Corporation | Heat exchanger assembled without brazing in which adhesive is used to seal a combined portion and a core plate |
US6145441A (en) * | 1998-04-02 | 2000-11-14 | The United States Of America As Represented By The Secretary Of The Navy | Frangible payload-dispensing projectile |
US6230630B1 (en) * | 1999-03-10 | 2001-05-15 | Perfect Circle Paintball, Inc. | Aerodynamic projectiles and methods of making the same |
US6615739B2 (en) * | 1999-03-10 | 2003-09-09 | Perfect Circle Paintball, Inc. | Aerodynamic projectiles and methods of making the same |
US6375981B1 (en) * | 2000-06-01 | 2002-04-23 | A. E. Staley Manufacturing Co. | Modified starch as a replacement for gelatin in soft gel films and capsules |
US6574945B2 (en) * | 2001-03-21 | 2003-06-10 | Lumitek Llc | Method for manufacturing a projectile containing chemiluminescent compounds |
US6530962B1 (en) * | 2001-08-31 | 2003-03-11 | R.P. Scherer Technologies, Inc. | Emulsion of water soluble dyes in a lipophilic carrier |
US6905426B2 (en) * | 2002-02-15 | 2005-06-14 | Acushnet Company | Golf ball with spherical polygonal dimples |
US20030158001A1 (en) * | 2002-02-21 | 2003-08-21 | Morgan William E. | Dimple patterns for golf balls |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080115660A1 (en) * | 2004-12-30 | 2008-05-22 | Edward Hensel | Remotely Controlled Marker For Hunting Games |
US20080035006A1 (en) * | 2005-02-05 | 2008-02-14 | Ciesiun Paul M | Bioluminescent paintball |
US20100083862A1 (en) * | 2005-02-05 | 2010-04-08 | Ciesiun Paul M | Water based paintall and method for fabricating water based paintballs |
US7905181B2 (en) | 2005-02-05 | 2011-03-15 | Ciesiun Paul M | Bioluminescent paintball |
US8479656B2 (en) | 2005-02-05 | 2013-07-09 | Hydro-Caps, Llc | Water based paintball and method for fabricating water based paintballs |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10371491B2 (en) | Gaming system using projectile and target | |
US9746297B2 (en) | Projectile | |
US3982489A (en) | Kinetic energy ring projectile | |
US8875634B2 (en) | Aerodynamic projectile | |
JP5221125B2 (en) | Golf ball with improved flight performance | |
US5448951A (en) | Rigid, fracturable projectiles for air powered guns | |
US4003574A (en) | Game ball | |
US9784540B2 (en) | Delivery shell using gyroscopic guiding system and methods of making the same | |
US3877381A (en) | Shotgun pellet arrangement | |
US4054120A (en) | Blow gun with mouthpiece indentations and projectile therefor prevented by indentations from movement therepast | |
JPH0596026A (en) | Golf ball and golf ball dimple | |
ES2705022T3 (en) | Missile warhead | |
CA2300117A1 (en) | Tossable ring airfoil projectile | |
US20060288898A1 (en) | Paintball | |
US20060011089A1 (en) | Paintball having reduced drag | |
US20170001088A1 (en) | Golf course-compatible modified golf game | |
US7882786B2 (en) | Paintball | |
US7690311B1 (en) | Non-lethal projectile with flowable payload | |
US9441926B1 (en) | Golf course-compatible modified golf game and safety equipment | |
GB2547002A (en) | An ammunition device | |
US10883807B2 (en) | Non-lethal payload projectile | |
US20200298063A1 (en) | Golf Ball | |
US6758772B1 (en) | Darts | |
US6439126B1 (en) | Enhanced kinetic energy projectile | |
US11428512B1 (en) | Projectiles for a paintball marker and systems |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |