EP3351891A1 - Obus de mortier - Google Patents
Obus de mortier Download PDFInfo
- Publication number
- EP3351891A1 EP3351891A1 EP17152022.4A EP17152022A EP3351891A1 EP 3351891 A1 EP3351891 A1 EP 3351891A1 EP 17152022 A EP17152022 A EP 17152022A EP 3351891 A1 EP3351891 A1 EP 3351891A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring groove
- mortar bomb
- main body
- mortar
- bomb
- 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.)
- Ceased
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B30/00—Projectiles or missiles, not otherwise provided for, characterised by the ammunition class or type, e.g. by the launching apparatus or weapon used
- F42B30/08—Ordnance projectiles or missiles, e.g. shells
- F42B30/10—Mortar projectiles
Definitions
- the present invention relates to a mortar bomb.
- a mortar bomb comprising: a main body; a nose; a tail extending from the main body, away from the nose; an obturating ring groove for accommodating, in use, an obturating ring, the obturating ring groove being located in the main body; wherein a maximum diameter of the main body is upstream of the obturating ring groove, toward the nose.
- the maximum diameter of the main body may be located upstream of the obturating ring groove by a distance of substantially 0.3 to 0.4 times a calibre of the mortar bomb.
- the maximum diameter of the main body may be located upstream of an edge of the obturating ring groove closest to the nose, by a distance of 0.3 to 0.4 times a calibre of the mortar bomb.
- a difference in diameter between the maximum diameter of the main body, and a diameter at the ring groove, may be 0.01 to 0.015 times a calibre of the mortar bomb.
- the diameter at the obturating ring groove may be the diameter at the greatest radial extent of the obturating ring groove.
- a profile of the main body may initially extend substantially axially with respect to a longitudinal axis of the mortar bomb.
- a profile of the main body may be curved to meet and blend with a profile of the tail.
- the profile of the tail immediately adjacent to the main body may extend substantially axially with respect to a longitudinal axis of the mortar bomb.
- a gradient of the main body profile, substantially in-between the ring groove and the tail may be greater than a gradient of a substantially straight line theoretically extending between the ring groove and the tail.
- a gradient of the main body profile is greater than a gradient of a substantially straight line theoretically extending between the ring groove and the tail.
- a mortar bomb main body comprising: an obturating ring groove for accommodating, in use, an obturating ring; wherein a maximum diameter of the main body is upstream of the ring groove.
- overpressure effects at the firing location of a mortar can have a negative effect on the people or objects in the vicinity of the firing location. It is desirable to avoid having to use additional equipment or procedures during the firing in order to limit or avoid the effects of the overpressure, or to at least reduce the need or level of such equipment or procedures. In general, reduction in overpressure makes it easier to operate the firing of the mortar bomb, or to work in the environment of such firing.
- a relatively straightforward way of reducing the overpressure effects is to simply reduce the overpressure, by way of reducing the charge that is required to fire the mortar bomb.
- reducing the charge would reduce the firing range of the mortar bomb. So, if this reduction in charge for firing the mortar bomb is to be realised in practice, a given or typical mortar bomb fired from the location will, ideally, need to somehow maintain its firing range, even through the firing charge is reduced.
- a mortar bomb can be re-designed or re-shaped to have reduced drag, thereby allowing the (i.e. a typical) mortar bomb to travel further (i.e. have a longer range) when used with the same charge, or to have the same range as a typical or standard (that is, not re-designed as described herein) mortar bomb when fired with a reduced charge.
- overpressure effects are reduced, for given firing range, when compared with an existing mortar bomb fired over that same range.
- An existing mortar bomb, and associated problems, will be described initially.
- An improved mortar bomb, according to example embodiments, will then be described.
- FIG 1 shows an existing mortar bomb (2). This same mortar bomb is shown in Figure 2 , with an outline view for clarity, so that the profile of the mortar bomb (2) can be more readily seen.
- Figure 3 shows a pressure profile about the mortar bomb (2) during flight. Increased regions of air pressure are shown in darker shading. It can be seen that at the high speeds typical due in the trajectory of a mortar bomb, significant air pressure shock (3) is located at or immediately adjacent to an obturating ring groove (4) of the mortar bomb (2).
- the obturating ring groove (4) is used to accommodate an obturating ring during firing of the mortar bomb. This shock (3), and its location at the obturating ring groove (4), significantly adds to the drag on the mortar bomb (2).
- Figures 4 and 5 schematically depict a region of the existing mortar bomb, around the obturating ring groove (4), in standard and outline views respectively. These Figures show that the main body of the mortar bomb has a diameter (6) which is at a maximum (8) at the location of the ring groove (4). The significance of this feature, relative to example embodiments, will be discussed in further detail below.
- FIGS 6 and 7 schematically depict a main-body of a mortar bomb (10) according to an example embodiment.
- the mortar bomb (10) of Figure 6 has an obturating ring groove (12) for accommodating, in use, an obturating ring. Upstream of that ring groove (12), at one end of the mortar bomb (10) is a nose (14) of the mortar bomb (10). At an opposite end of the main body, remote from the nose (14), is a tail (16) of the mortar bomb (10).
- the tail (16) typically defines, is, or is attached to, one or more fins for stabilising the mortar bomb (10) during flight.
- the nose (14) of the mortar bomb (10) might be, or comprise (e.g. house) a fuze.
- the nose (14) might be attached or attachable to, or part of, the main body of the mortar bomb (10). That is, the nose (14) and main body may not be formed integrally with one another.
- regions upstream (18) of the ring groove (12), toward the nose (14), and downstream (20) of the ring groove (12), toward the tail (16) have been re-designed or re-shaped to reduce drag.
- FIGS 8 and 9 schematically depict principles associated with a maximum diameter of a mortar bomb according to an example embodiment, in standard and outline views respectively.
- the mortar bomb according to example embodiments will, of course, have a diameter (22) which will reach a maximum (24).
- the maximum diameter (24) does not occur (i.e. is not located) at the obturating ring groove (12), but is instead located upstream of the obturating ring groove (12), towards the nose of the mortar bomb.
- the difference in profile of the main body with respect to the location of the maximum diameter (24) of the mortar bomb is subtle but extremely important. It has been found that this subtle but fundamental change in the profile of the mortar bomb has a significant effect on the air pressure profile in the vicinity of the mortar bomb during its trajectory. In particular, it has been found that the air pressure shock is moved upstream of the ring groove (12), significantly reducing air pressure drag. While the shock is indeed moved upstream, the fact that the shock is allowed to form on a continuous body geometry, rather than the sudden change associated with the groove (12), is what causes the reduction in drag to be so pronounced.
- the maximum diameter of the main body is at the same location as the obturating ring groove.
- the diameter at or of the obturating ring groove will be different to the maximum diameter of the main body of the mortar bomb.
- drag reduction might be optimised when a difference in diameter between the maximum diameter of the main body, and a diameter at the obturating ring groove, is 0.01 to 0.015 x a (typical) calibre of the mortar bomb.
- Re-designing or re-shaping the profile of the mortar bomb upstream of the ring groove as discussed above has been found to lead to a reduction in drag.
- the rear section of the mortar bomb according to example embodiments, downstream of the ring groove and towards the tail of the mortar bomb, can also be re-designed or re-shaped to reduce or further reduce drag.
- Figure 10 shows a comparison between profiles, downstream of the ring grooves (4, 12) of an existing profile (26), and a profile according to an example embodiment (28).
- Figure 10 shows that the downstream or rear section of example embodiments has been altered to have a generally shallower gradient extending away and down from the ring groove (12), toward the tail (16). This is to the extent that a gradient of the main body profile, substantially in-between the ring groove (12) and the tail (16) (i.e. substantially at and/or around a mid-point (29) between the ring groove (12) and the tail (16)) is greater than a gradient of a substantially straight line theoretically extending between the ring groove and the most upstream section of the tail.
- the rear profile of an existing mortar bomb, downstream of the ring groove (4) typically extends in such a linear manner
- Figure 11 shows an exploded view of Figure 10 that focuses on the vicinity of the ring groove (4, 12).
- the profile of the main body of example embodiments (28), downstream of the ring groove (12) and immediately adjacent to the ring groove (12) extends substantially axially with respect to a longitudinal axis of the mortar bomb.
- This same Figure also shows how the existing profile gradient (26) is more linear, and has a far steeper gradient, immediately extending away from the ring groove (4), than the shallower gradient of the profile (28) of example embodiments that extends from the ring groove (12).
- This example embodiment profile (28) feature, again, reduces drag.
- Figure 12 shows an exploded view of the comparison of Figure 10 , but now in the vicinity of where the main body of the mortar bomb meets the tail (16) of the mortar bomb.
- the profile (26) of the existing mortar bomb extends substantially linearly towards and into angled adjoinment with the tail (16).
- the tail (16) extends substantially axially in respect to the longitudinal axis of the mortar bomb.
- a gradient of the main body profile (28) of example embodiments is curved to meet and blend with the profile of the tail.
- This example embodiment profile (28) feature, again, reduces drag.
- Figure 13 shows the pressure profile surrounding the mortar bomb (10) of example embodiments, during a flight trajectory of the mortar bomb (10). It can be seen that the highest pressure region, or shock (30), is no longer located at the location of the obturating ring groove (12), but has moved upstream of the obturating ring (12) towards the nose of the mortar bomb (10). In particular, the shock (30) will still be located at or near the largest diameter of the main body, but in accordance with example embodiments, this largest diameter is away from, not at, the location of the ring groove (12). Overall, drag is significantly reduced. The changes to the profile downstream of the ring groove (12) work synergistically with this change in location of maximum diameter, to reduce drag even further.
- Figure 14 is included simply to easily show the comparison of the pressure profiles with the existing mortar bomb (2) and the re-shaped or re-designed mortar bomb (10) according to example embodiments. Again, it can be seen that drag is significantly reduced with the mortar bomb (10) of example embodiments, as discussed above.
- the shock (3, 30) in particular, is significantly reduced in accordance with example embodiments (30).
- the invention has further benefits, in that if a given charge for firing a mortar is not reduced, the mortar described above will have an increased range. Also, it will be appreciated that the mortar as described above can be used with existing firing apparatus. That is, the firing apparatus does not have to be re-designed or otherwise modified to accommodate the firing of the new mortar bomb discussed above, while still enjoying the described benefits.
- the invention relates generally to a mortar bomb. However, the invention relates perhaps most specifically to a main body of such a mortar bomb. So, the main body as described above could be used with, and attached to, existing noses or even tails.
- an "obturating ring” as used herein is typically a ring of relatively soft material designed to obturate under pressure to form a seal.
- Obturating rings are often found in artillery and other ballistics applications.
- the "ring groove” described herein is typically continuous around a circumference of the mortar bomb, but in some examples could be substantially continuous, or discontinuous (e.g. comprise one or more interruptions), such that the "obturating ring groove” is a groove that generally extends around the circumference of the mortar bomb in a ring-like manner.
- Changes in the diameter of the main body, or changes in location of the maximum diameter of the main body may be such that an existing obturating ring (suitable for a non-modified/re-designed main body/mortar bomb) may still be suitably used.
- a different obturating ring can be used (e.g. one with a different inner and/or outer diameter) if changes in the diameter of the main body, or changes in location of the maximum diameter of the main body, are such that the existing obturating ring does not function as intended.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP17152022.4A EP3351891A1 (fr) | 2017-01-18 | 2017-01-18 | Obus de mortier |
| US16/469,989 US10473442B1 (en) | 2016-12-16 | 2017-11-29 | Mortar bomb |
| PCT/GB2017/053598 WO2018109436A1 (fr) | 2016-12-16 | 2017-11-29 | Bombe à mortier |
| PT178085635T PT3555555T (pt) | 2017-01-18 | 2017-11-29 | Bomba de morteiro |
| LTEP17808563.5T LT3555555T (lt) | 2016-12-16 | 2017-11-29 | Minosvaidžio mina |
| EP17808563.5A EP3555555B1 (fr) | 2016-12-16 | 2017-11-29 | Obus de mortier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP17152022.4A EP3351891A1 (fr) | 2017-01-18 | 2017-01-18 | Obus de mortier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3351891A1 true EP3351891A1 (fr) | 2018-07-25 |
Family
ID=57850941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17152022.4A Ceased EP3351891A1 (fr) | 2016-12-16 | 2017-01-18 | Obus de mortier |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3351891A1 (fr) |
| PT (1) | PT3555555T (fr) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR774170A (fr) * | 1933-08-02 | 1934-12-03 | Perfectionnements apportés aux projectiles d'artillerie, notamment à ceux dits à auto-percussion | |
| US2315145A (en) * | 1938-07-30 | 1943-03-30 | Wauters Jean | Vaned projectile |
| US3023704A (en) * | 1957-07-29 | 1962-03-06 | Dawson Philip John | Projectiles for mortars and like projectors |
| GB933114A (en) * | 1960-06-29 | 1963-08-08 | Hotchkiss Brandt | Improved projectile for a mortar having a non-rifled bore |
| US4413567A (en) * | 1979-09-08 | 1983-11-08 | Etablissement Salgad | Fin-stabilized mortar grenade |
-
2017
- 2017-01-18 EP EP17152022.4A patent/EP3351891A1/fr not_active Ceased
- 2017-11-29 PT PT178085635T patent/PT3555555T/pt unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR774170A (fr) * | 1933-08-02 | 1934-12-03 | Perfectionnements apportés aux projectiles d'artillerie, notamment à ceux dits à auto-percussion | |
| US2315145A (en) * | 1938-07-30 | 1943-03-30 | Wauters Jean | Vaned projectile |
| US3023704A (en) * | 1957-07-29 | 1962-03-06 | Dawson Philip John | Projectiles for mortars and like projectors |
| GB933114A (en) * | 1960-06-29 | 1963-08-08 | Hotchkiss Brandt | Improved projectile for a mortar having a non-rifled bore |
| US4413567A (en) * | 1979-09-08 | 1983-11-08 | Etablissement Salgad | Fin-stabilized mortar grenade |
Also Published As
| Publication number | Publication date |
|---|---|
| PT3555555T (pt) | 2020-11-13 |
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| AX | Request for extension of the european patent |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18R | Application refused |
Effective date: 20180811 |