CN110621956A

CN110621956A - The projectile body is in the form of a hollow tube and has a bulge or a recess or both a bulge and a recess inside, and the projectile body is rotated by air circulating through the middle

Info

Publication number: CN110621956A
Application number: CN201880027264.2A
Authority: CN
Inventors: 马丁·鲍姆豪斯
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-04-25
Filing date: 2018-04-23
Publication date: 2019-12-27
Also published as: US20200132422A1; WO2018206025A1; JP2020517905A; EP3615883A1; DE102017004142B3

Abstract

The present invention describes a tubular projectile which is particularly suitable for launching a bow (e.g. bolt and arrow), but which may also be launched using other shooting means (e.g. firearms). After firing, the arrow will rotate about its longitudinal axis due to the air circulating in the middle. The rotation is brought about by the fact that elevations or depressions are provided on the inner surface, which elevations or depressions are mainly of linear design and, through interaction with the air circulating in between, cause the arrow shaft or hollow tube to rotate in a stable trajectory. Thus, such arrows generally require no or only a small amount of fletching or other elements that stabilize the flight path.

Description

The projectile body is in the form of a hollow tube and has a bulge or a recess or both a bulge and a recess inside, and the projectile body is rotated by air circulating through the middle

Description of the invention

Internal name: iArrow (also known as IARV-arrow, iPFeil, IARV arrow)

The invention name is as follows:

The invention is named as IARV arrow, which is composed of hollow tube, especially can be used as projectile when bow is launched, and also can be used as firearms.

Instead of or in addition to feathering or other well-known solutions for stabilizing the trajectory of projectiles such as screws and arrows, bulges and depressions are provided on the inside, for example in the form of a helical progression in one or more regions of the hollow tube.

The ridges or depressions deflect the air circulating in the middle from a straight flow direction, and the IARV arrow itself rotates about its longitudinal axis in the opposite direction according to the law of conservation of angular momentum.

The elevations or depressions (hereinafter "means") may be distributed as individual elements ("nodes"), or as a continuous or broken line over one or more sub-regions of the hollow tube, and then generally form a helical progression.

The elevations or depressions may have different heights or depths, or they may be different within the projectile.

The linear measure may be segmented, may have a break point in the process of advancing, or may take the form of a plurality of linear regions. A single element and wire-like measure, or a combination of bumps and dimples of different heights or depths, can improve efficiency-e.g., can increase the speed of an IARV arrow, increase range, or reduce vibration.

When a wire-like shape is used, the coil pitch of the generally helical advance region will vary, for example in order to optimize the interaction between the different flight phases and the intermediate ventilation air.

Thus, the projectile-velocity will peak during firing, and its natural rotation will be minimized. During flight, the speed will generally decrease, while the rotational speed will increase and may gradually approach the highest value. This measure can be adapted to these different boundary conditions in order to optimize specific flight properties throughout the flight.

One possibility is to design measures with a short coil pitch for a small piece in order to speed up the spin start and acceleration after the transmission, while the other part with a longer coil pitch optimizes the spin to the target value in the subsequent flight phase. The ridges or depressions may be applied to any region of the projectile, such as only the head region or the tail, and in combination with each other, to maximize efficiency and to be adjustable for different launch devices, to achieve a particular design or individual launch velocity of the launch device.

In this manner, rotation is achieved without active components such as a barrel or transmission, thereby stabilizing flight and reducing possible vibration after launch of the IARV arrow.

Kinetic energy is transferred from the launching impulse to the rotation. The reduction in velocity reduces air drag and increases the possible flight distance. Upon target hit, rotational kinetic energy is released and increases the possible penetration depth.

The IARV arrow is particularly suited for bow, crossbow or slingshot firing, and may also be accelerated by compressed air, or explosives and fuels.

The tips (the ends of the tubes facing in the direction of flight) may be fitted with arrows, provided that they have air inlets for air to flow in between, or in some other way for air to be led to the interior of the duct. The tip may also take other forms which can increase the penetration depth into the target due to the rotation of the IARV arrow. This may be accomplished by, for example, sharpening the pipe, cutting the pipe, or cutting a serrated edge at the tip of the thumb arrow.

The tip may be further weighted to improve the flight path if necessary for functional purposes.

One end of the arrow (the end of the rod opposite to the flight direction) can pass through a notch, so that the bowstring can be conveniently shot by using a bow or a proper crossbow.

The flight properties can be optimized by adding fletching or spiral bumps or depressions on the outside

Prior Art

Arrows have been known for thousands of years, and the basic principle has been almost unchanged. A rod shaped projectile is fired under mechanical acceleration of a firing means such as a bow, crossbow or slingshot and then impacts the target on a subsequent unpowered trajectory.

In terms of stabilization and extension of the flight path, it is common practice to add fletching or the like at one end of the reverse flight path.

These measures increase the air resistance if the projectile rubs against the launching device during the launch or positive acceleration phase, resulting in projectile deflection and vibration. The aerodynamic properties of these measures can seriously affect the accuracy and reproducibility of the flight path, in particular its mechanical changes such as aging and wear.

Fletching or the like also reduces the efficiency of space usage for storage and transport (e.g., arrow bags) and increases production costs.

In DE000019638264C2, a bow is described, which has a tube mounted on a bow for passing the arrow, which is guided in rotation, thus stabilizing its flight path. On the contrary, in the invention, the arrow alone makes the rotation stable, and the launching device has no change.

An arrow is described in DE000008810059U1, which uses specially designed fletching to rotate the arrow about its longitudinal axis. In contrast to this invention, the IARV arrow does not need to be rotated by means of fletching.

A dart is described in patent GB2385804(a), which can prevent the dart from jumping out of the dart board. However, this dart makes no change in the stabilization of flight, and therefore it cannot predict the characteristics of the present invention.

In patent GB0201183.1, an arrow is described, which consists of a hollow tube with different internal diameters throughout the tube in order to optimize the weight distribution and to increase the stability, in particular for the target. On the one hand, this invention relies on the material being applied with radial symmetry, and on the other hand, it is independent of any technical attributes concerning flight stabilization, except for the weight distribution. It is not predictive of the nature of the invention.

On the contrary, the present invention eliminates the need for fletching or the like, either entirely or to a large extent, and thus avoids the above-mentioned problems in terms of production, launch, flight path, storage and transportation. The invention can be used without changing the emitting device or without any special function of the emitting device. In the present invention, optionally, special adjustment of the transmitting means can further improve the efficiency.

The invention also allows the production of projectiles in one or a limited number of materials, with fewer steps, to be simpler, less expensive, more material-saving and also largely automated.

Claims

1. Hollow tube ("projectile" or "IARV arrow"), characterized in that, wherein, due to the presence of protuberances and/or depressions inside said tube, after being launched with a suitable device, such as a bow-crossbow, the rotational movement is achieved, intensified, maintained, or slowed down due to the medium circulating in the middle during the movement.

2. Projectile in accordance with claim 1, wherein said elevations and/or depressions are present as small elements ("nodes") or are present in a string, which applies in particular to a spiral arrangement of nodes and/or to a line of elevations and/or depressions whose height or depth and their spacing, for example the coil spacing, and distribution over the inner wall of the hollow tube ("optimization options") may differ, these different optimization options in different forms being optionally combined with one another.

3. The projectile of claim 1 wherein said elevations and/or depressions are arranged such that a desired rotational speed, if necessary gradually, is achieved or that rotational movement is stopped or slowed (e.g. not desired).

4. Projectile in accordance with claim 1, characterized by the fact that the increased diameter at the front end in the direction of flight is used to better suck in the medially circulating medium or that additional openings ("entrance slits") are added, which serve to improve the entry of the medially circulating medium.

5. Projectile in accordance with claim 1, characterized in that at the front end (in the direction of flight) elements of increased weight are provided, or that heavier materials are used, for example to increase the material strength there, or that other heavier materials or additional casings or optionally built-in additional heavy rings are used as ballast.

6. Projectile in accordance with claim 1, characterized in that at the rear end (of the opposite trajectory) an element is provided, mainly realized by a notch, to embed the chord.

7. Projectile in accordance with claim 1, wherein a plurality of projectiles of different diameters are designed to be inserted into each other, for example in order to save space.

8. Projectile in accordance with claim 1, characterized in that a spike, edge or taper is provided at the front end (in the direction of flight) in order to increase the penetration depth into the target by minimizing the impact area or by a rotation-independent cutting effect.

9. Projectile in accordance with claim 1, characterized in that an element is provided at the front end (in the direction of flight) in order to increase the penetration depth or influence on the target by the rotation, for example the opening of the hollow tube can be of a sawtooth design, allow arrow penetration into the target in a grinding manner, or of a drill point design.

10. Projectile in accordance with claim 1, characterized in that elements are provided on said projectile which, by additional properties, produce an effect independent of the impact and rotation of the projectile, such as, for example, explosive tips, harmful or toxic substances, materials intended for a splitting effect, or the like.