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4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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Coilgun's rules project

Author Post
Evgenij
Tue Jun 03 2008, 06:09PM Print View
Registered Member #200
Joined: Sat Feb 18 2006, 01:49AM
Location: Pskov, Russia
Posts: 21
The regulations for standardization of coilgun’s constructions are discussed by Russian coilgun-community.

The purposes of regulations:
1. To create the necessary prerequisites for possible realization of shooting competitions.
2. To create the necessary prerequisites for changing the legislation to accept coilguns as a sport weapon.
3. To direct researcher’s energies to increase projectile’s energy and speed by increasing of coilgun’s efficiency, not by simple extension of source capacitor’s energy.
4. To direct researcher’s energies to increase coilgun’s shooting accuracy.
5. To create more clear aims for coilgun’s researchers, like basic parameters of production devises and conditions of using.

After preliminary discussion the groups with limit of weight, capacitor’s initial energy and length of coilguns were suggested.
Moreover, the classification envisages division on pistols and rifles, dependent on keeping of coilgun in one or two hands.

==== Quote
This document setting rules for coilgun's shooting competitions.

Edition 1.0 at June 2008. Status: discussing.

Basic Groups of Coilgun

The maximal parameters of coilgun pistols

P1 – 125 J, 1 kg, 300 mm.
P2 – 250 J, 2 kg, 350 mm.

The maximal parameters of coilgun rifles

R3 – 250 J, 3 kg, 800 mm.
R4 – 500 J, 4 kg, 1000 mm.
R5 – 750 J, 5 kg, 1200 mm.
R6 – 1000 J, 6 kg, 1200 mm.

In each group two exercises should be executed

A – shooting for accuracy.
The type of target: Olympic 10 Meter Air Pistol Target
See pdf-file with the picture. 10m_air_pistol.pdf
Outer diameter of target is 155.5mm.
Distance: 5 or 10 meters.
3 trial shoots and 10 examination shoots.
Total time of exercise - 20 minutes.
The result – the whole sum of points from 10 examination shoots.

B – shooting for speed.
Targets - some identical subjects, which are standing in the line (see the picture).
For example, some cigarettes boxes.
It is necessary to knock down all targets as quickly as possible (it is one attempt). For example, 5 targets on 5 or 10 meters distance.
One trial attempt and 3 examination attempts of shoots.
The pause between attempts – one minute.
The result – total time of examination attempts.




==== End quote

Tell your ideas and supplements about this rules, please.
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Evgenij
Fri Jun 06 2008, 09:53AM
Registered Member #200
Joined: Sat Feb 18 2006, 01:49AM
Location: Pskov, Russia
Posts: 21
Link to main page: Coilgun's rules
Correct grammatical errors in text, if English – native language for you, please.
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Bjørn
Fri Jun 06 2008, 10:49AM

Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2023
What is the definition of "Initial energy"? The speed shooting makes little sense without a proper definition.

What about the projectiles? With no rules someone will show up with guided or explosive projectiles.
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OZZY
Fri Jun 06 2008, 12:07PM
Registered Member #511
Joined: Sat Feb 10 2007, 11:36AM
Location: Somerset UK
Posts: 55
Hi Evgenij

Some thoughts

In the accuracy competition you need to define whether the card is scored as inward gauging or outward gauging. Inward gauging would favor large calibre projectiles because they make a bigger hole, outward gauging favors small calibre projectiles. Is there any limit on calibre.

3. To direct researcher’s energies to increase projectile’s energy and speed by increasing of coilgun’s efficiency, not by simple extension of source capacitor’s energy.

Neither competition places a premium on velocity or kenetic energy. The accuracy competition will need consistant velocity and stable projectiles. The speed competition will need very fast charging or multiple shots without re-charging. I see no point in having different classes for coilguns with different energies.
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Evgenij
Fri Jun 06 2008, 12:35PM
Registered Member #200
Joined: Sat Feb 18 2006, 01:49AM
Location: Pskov, Russia
Posts: 21
Bjørn Bæverfjord wrote ...

What is the definition of "Initial energy"? The speed shooting makes little sense without a proper definition.

What about the projectiles? With no rules someone will show up with guided or explosive projectiles.

Thanks for the important remarks.

The note 1. Projectiles should be made of usual low carbon steel, such as 1006 steel and 1010 steel. Use of the special alloys similar to vanadium permedur - is not supposed. The projectiles can be equipped with the additional fly stabilizer from steel or non-magnetic material.

The note 2. Initial energy is an energy up to which capacitors before each shot are charged.

The note 3. It is supposed to use the open collimator sight.

These additions correct?

What variant from two more suitable?

1.The maximal parameters of coilgun rifles

Var.1
R3 – 250 J, 3 kg, 800 mm.
R4 – 500 J, 4 kg, 1000 mm.
R5 – 750 J, 5 kg, 1200 mm.
R6 – 1000 J, 6 kg, 1200 mm.

Var.2
R3 – 250 J, 3 kg, 800 mm.
R4 – 500 J, 3.5 kg, 1000 mm.
R5 – 750 J, 4 kg, 1200 mm.
R6 – 1000 J, 4.5 kg, 1200 mm.

2 OZZY: You suggest to clean restrictions on energy and to leave different classes with different weight?
This wise offer as it seems to me. Then classification can be such:

Var.3
R3 – 3 kg, 800 mm.
R4 – 3.5 kg, 1000 mm.
R5 – 4 kg, 1200 mm.
R6 – 4.5 kg, 1200 mm.

If to develop further this offer also restriction of length does not look obligatory
under condition of measurement of a distance to a target from a forward cut of a barrel.

Var.4
R3 – 3 kg.
R4 – 3.5 kg.
R5 – 4 kg.
R6 – 4.5 kg.
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Bust_A_Cap
Tue Jun 24 2008, 06:17PM
Registered Member #1561
Joined: Mon Jun 23 2008, 07:58PM
Location:
Posts: 25
this is pretty cool, it's good to see someone finally trying to put some restrictions on coilgun research so that we don't keep seeing coilgun's just getting bigger and bigger...even though it's pretty amazing.

Perhaps in a later competition you could restrict the weight of the coilgun.

Also you should define whether multiple stages are allowable or not.

Is this a compeition idea that your posing to the forums here? or is this just something that the Russian Coilgun Community were disscussing and?
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polop
Tue Jun 24 2008, 10:18PM
Registered Member #1537
Joined: Thu Jun 12 2008, 06:44PM
Location:
Posts: 51
if this is a research project limiting number of stages and material of projectile i sdefeating the aim of the project for example adding a strong small magnet at the base of the projectile with accurate switching must increase efficiancy. multi stage guns will give better efficiency. so in order for this to work i think there needs to be less restrictions in development with only two aims -
eficiency and compactness
as these are the issue with coil guns that are most restrictive
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Evgenij
Mon Jul 14 2008, 11:26PM
Registered Member #200
Joined: Sat Feb 18 2006, 01:49AM
Location: Pskov, Russia
Posts: 21
Bust_A_Cap wrote ...

Perhaps in a later competition you could restrict the weight of the coilgun.

Also you should define whether multiple stages are allowable or not.

Is this a compeition idea that your posing to the forums here? or is this just something that the Russian Coilgun Community were disscussing and?
Multiple stages allow.

The offered rules is only the first attempt of conversation on this theme. Really to lead competitions it is impossible. A problem that there are no coilguns (except for one or two), capable to take part in competitions. The reason of it is at creation designs their authors did not assume practical use. Therefore the majority of designs have appeared are of little use. From them it is impossible to shoot on a distance of more than several meters and to get in a target.

Authors understand practical uselessness of created devices, but new designs appear. To think out and make them it is interesting. Nobody thinks of practical using. Therefore to shoot there is nothing.
To change a situation, I suggest to discuss and accept rules. This rules will good, or no - it is not important. The main thing - that they were. As a result of it authors of new designs will think of possible practical application. There will be a purpose for activity.

If rules will direct efforts of authors to a practical direction, there will be more suitable designs. Then it will be possible to speak about competitions more detail. Today rules is the formulated technical specification on a problem for the designer. The formulated purpose for the created device. The purpose and a problem which coilgun should be able to make.

The last edition rules here
Think, offer your changes.
Result should be the capable to sports shooting new coilguns.
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Ragnarok
Tue Jul 15 2008, 12:19AM
Registered Member #659
Joined: Fri Apr 20 2007, 09:14AM
Location: SW Hertfordshire, UK
Posts: 75
Bust_A_Cap wrote ...
this is pretty cool, it's good to see someone finally trying to put some restrictions on coilgun research so that we don't keep seeing coilgun's just getting bigger and bigger...even though it's pretty amazing.

Yeah, that's quite a good thing.
I spend a lot of time building spudguns and air cannons, and with a lot of people, if they want more result they just use a bigger cannon, but I'm more interested in getting more result out of a cannon of the same sort of size.

I'm looking to do a project with a coilgun that's either a large pistol or some kind of carbine. I'm setting myself some fairly challenging objectives for it too, although whether I'll hit all of them will remain to be seen.
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