SpudFiles Wiki - User contributions [en]

Vortex cap BBMG

2012-01-22T21:35:13Z

Davidvaini: /* Examples of Vortex cap BBMGs */

This type of [[BB machine gun]] has a unique mechanism of operation and is typically a cap in shape and is made out of strong materials such as PVC or metal. Their construction is similar to the [[vortex block]], in which an air inlet and a hole for a [[barrel]] are drilled perpendicular to each other. The vortex cap was designed by Gatorlangman AKA DavidVaini and provides a small substitute to the standard vortex or [[Inline Vortex BBMG|inline vortex]] blocks.

Since the cap itself creates the vortex easy modifications can be done to make magazines. A screw on cap with a spring housed inside of a pipe can be snapped down into a vortex cap for an easy-to-use magazine loaded system. Some of the designs for magazines are shown in the image below:

[[Image:vortexcapimage1.jpg|thumbnail|center|700px]]

= Examples of Vortex cap BBMGs =

<gallery widths="200px" heights="200px" perrow="3">
Image:VCexample1.jpg
Image:VCexample3.jpg
</gallery>

[[Category:BB machine gun]]

Vortex cap BBMG

2009-06-19T17:42:03Z

Davidvaini:

Burst disk

2008-09-08T05:33:21Z

Davidvaini:

A '''burst disk''' consists of a thin disc of airtight material that will rupture at a certain pressure, held in place inside a [[union]] or cam lever coupling. (See the [[burst disk material]] page.)

Since the burst disk ruptures almost instantly when the pressure gets to a certain point, they have the fastest [[opening time]] of any [[valve]] in existence. Since they are pressure-triggered they are nearly always used in [[hybrid cannon|hybrids]], they are also occasionally used as the main valve in a [[pneumatic cannon]] because of their superior performance. Sometimes they are used as a secondary valve in a [[pneumatic cannon]] to compensate for the slower opening time of the main valve.

Burst disks are a very close rival to a [[ball valve]] in cost, at roughly $13 for a 2" [[union]] in sch 40 PVC. More expensive (but convenient) devices exist, such as [[camlock coupling]]s.

To use, [[solvent welding|solvent weld]] your chamber to one half of your union or cam coupling. One then 'loads' the valve by putting one or more layers of [[burst disk material]] (such as aluminum foil, or a piece of a beverage container) in between the two halves of the union or coupling. The union or cam coupling is then tightened down, locking the burst disk in place.

In a hybrid cannon, burst disks fail when the pressure builds due to the combusting gases. Prior to this, the chamber was containing the flammable gases at a relatively low pressure. They are also sometimes used on [[combustion cannon]]s - for their noisemaking capabilities, and/or their ([http://www.advancedspuds.com/burstdisk.htm debated]) performance improvement.

In a pneumatic cannon, they can be used in the same way, simply pointing the cannon in the correct direction and filling it until it fires. However, many opt to use another system because of the inherent safety issues with this. Such systems include puncturing it with a pointy object (such as a nail) attached to the end of the projectile, melting it with an electrically heated wire, or having a pneumatically [[triggered burst disk]] system using dual burst disks.

Since Burst disks only last for a single shot and need to be replaced before each round, [[Burst Disk Cartridge]]s (BDC) have been created.

[[category:valves]]

File:TVexample9.jpg

2008-06-04T05:06:28Z

Davidvaini:

File:TVexample8.jpg

2008-06-04T05:06:13Z

Davidvaini:

Tee Vortex BBMG Gallery

2008-06-04T05:04:04Z

Davidvaini:

[[Image:TVexample1.jpg]]

[[Image:TVexample2.jpg]]

[[Image:TVexample3.jpg]]

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File:TVexample7.jpg

2008-06-04T05:02:27Z

Davidvaini:

File:TVexample6.jpg

2008-06-04T05:02:08Z

Davidvaini:

File:TVexample5.jpg

2008-06-04T05:01:51Z

Davidvaini:

File:TVexample4.jpg

2008-06-04T05:01:37Z

Davidvaini:

File:TVexample3.jpg

2008-06-04T05:01:19Z

Davidvaini:

File:TVexample2.jpg

2008-06-04T05:01:02Z

Davidvaini:

File:TVexample1.jpg

2008-06-04T05:00:46Z

Davidvaini:

Tee Vortex BBMG Gallery

2008-06-04T05:00:17Z

Davidvaini: New page: Image:TVexample1.jpg Image:TVexample2.jpg Image:TVexample3.jpg Image:TVexample4.jpg Image:TVexample5.jpg Image:TVexample6.jpg Image:TVexample7.jpg [[Imag...

Tee vortex BBMG

2008-06-04T04:58:48Z

Davidvaini:

This specifically shaped object made of a semi-hard to hard material is used in a [[BB machine gun]] to take bb's located outside of this part and suck them into the [[barrel]] of the [[BB machine gun]]. Some people use lathes in order to turn pieces of aluminum for the construction of a vortex, while others prefer using [http://www.bondo-online.com/catalog_item.asp?itemNbr=176 Bondo Auto Body Filler] molded in a PVC plug. Designs for building a Bondo vortex can be found on Burnt Latke's [http://www.burntlatke.com/bb.html BB machine gun construction] page.

[[Image:Vortexanimated.gif]]

[[Tee Vortex BBMG Gallery]]

File:VCexample3.jpg

2008-06-04T03:29:37Z

Davidvaini:

File:VCexample2.jpg

2008-06-04T03:29:17Z

Davidvaini:

File:VCexample1.jpg

2008-06-04T03:28:54Z

Davidvaini:

Gallery of Vortex Cap BBMG's

2008-06-04T03:25:14Z

Davidvaini:

[[Image:VCexample1.jpg]]

[[Image:VCexample2.jpg]]

[[Image:VCexample3.jpg]]

Gallery of Vortex Cap BBMG's

2008-06-04T03:24:37Z

Davidvaini: New page: Image:VCexample1.jpg

[[Image:VCexample1.jpg]]

Vortex cap BBMG

2008-06-04T03:23:23Z

Davidvaini:

Typically a cap in shape and is made out of strong materials such as PVC or metal. Their construction is similar to the [[vortex block]], in which an air inlet and a hole for a [[barrel]] are drilled perpendicular to each other. The vortex cap was designed by Gatorlangman and provides a small substitute to the standard vortex or inline vortex blocks.

Since the cap itself creates the vortex easy modifications can be done to make magazines. A screw on cap with a spring housed inside of a pipe can be snapped down into a vortex cap for an easy-to-use magazine loaded system. Some of the designs for magazines are shown in the image below:
[[Image:vortexcapimage1.jpg]]

[[Gallery of Vortex Cap BBMG's]]

Gallery of Inline Vortex BBMGs

2008-06-04T03:21:57Z

Davidvaini:

[[Image:IVexample1.jpg]]

[[Image:IVexample2.jpg]]

[[Image:IVexample3.jpg]]

[[Image:IVexample4.jpg]]

[[Image:IVexample5.jpg]]

[[Image:IVexample6.jpg]]

[[Image:IVexample7.jpg]]

[[Image:IVexample8.jpg]]

File:IVexample8.jpg

2008-06-04T03:21:01Z

Davidvaini:

File:IVexample7.jpg

2008-06-04T03:20:39Z

Davidvaini:

File:IVexample6.jpg

2008-06-04T03:20:23Z

Davidvaini:

File:IVexample5.jpg

2008-06-04T03:19:41Z

Davidvaini:

File:IVexample4.jpg

2008-06-04T03:19:25Z

Davidvaini:

File:IVexample3.jpg

2008-06-04T03:19:08Z

Davidvaini:

File:IVexample2.jpg

2008-06-04T03:18:42Z

Davidvaini:

File:IVexample1.jpg

2008-06-04T03:14:49Z

Davidvaini:

Gallery of Inline Vortex BBMGs

2008-06-04T03:08:01Z

Davidvaini: New page: Image:IVexample1.jpg Image:IVexample2.jpg Image:IVexample3.jpg Image:IVexample4.jpg Image:IVexample5.jpg Image:IVexample6.jpg Image:IVexample7.jpg [[Imag...

Inline Vortex BBMG

2008-06-04T02:26:02Z

Davidvaini:

An Inline Vortex BBMG as the name suggests, uses a vortex block as the main feeding system. The inside of the vortex block is where all the magic happens. The inside is circular in shape and guides the BBs around and around until they get chambered into the barrel. What causes the BBs to spin around is the stream of air supplied from the air inlet. None of this would matter though if the bb's could not make it to the vortex block. With the traditional "T" Vortex block BBMG you would have to aim down for the gun to fire or shake the gun up and down. This can be solved by adding a [[plunger system]] that pushes the BBs towards the vortex block at all times and directions. Shown below is an animation that shows this concept.

[[Image:Inlinevortexanimationgiffinal2.gif]]

[[Gallery of Inline Vortex BBMGs]]

Main Page

2008-06-04T00:31:29Z

Davidvaini: /* BB Machine Gun */

== The Spudding Handbook ==
Welcome to The Spudding Handbook! This wiki format handbook contains all of the information you will ever need to build spudguns, and much more besides. The purpose of this handbook is to explain the principles of spudguns and how they are built and operated. All of the information contained in this handbook is free and available to anybody who wishes to view it.

Look around and enjoy your stay.
--[[User:BC Pneumatics|BC Pneumatics]] 02:13, 31 May 2008 (EDT)
[[Image:Cannon.jpg|frame|An Advanced Combustion Cannon]]
==What is a Spudgun?==
''Main article: [[What_is_a_spudgun%3F|What is a spudgun?]]''

There are many different names for spudguns. They are called potato cannons, spud launchers, potato guns, spud cannons, and a host of others. Whatever you decide to call it, all of the aforementioned describe the same type of device: a device used to accelerate a potato down the barrel, and launch it some distance. While it may offend some purists, the humble little potato is quickly losing favour to other ammunitions such as golf balls, tennis balls, and other cheap, uniform projectiles.

==Types of Spudguns==

=== [[Pneumatic_launcher|Pneumatic Launchers]] ===

These use the energy stored in compressed gas to launch a projectile. The launchers chamber is pressurised and the gas held back from the barrel by a valve. When the valve is opened the gas is allowed to rapidly expand and escape down the barrel forcing the projectile out before it.

=== Combustion Launchers ===

* '''[[Combustion_launcher|Regular Combustions]]'''

These find the energy needed to launch a projectile from the combustion of a gaseous fuel and air mixture. The fuel is added to the air already in the chamber, the chamber is sealed and the mixture ignited. This combustion creates a pressure spike that forces the projectile out through the connected barrel.

* '''[[Hybrid_launcher|Hybrid Launchers]]'''

Hybrid launchers are a special type of combustion launcher that use a pre-pressurised fuel/air mixture. This results in a higher pressure and hotter combustion on ignition, thereby transferring more energy to the projectile.

=== [[BB Machine Gun]]s ===
A [[BB Machine Gun]] (BBMG) is a device designed to shoot a large volume of small diameter ammo, typically plastic airsoft or steel BBs. BBMGs are pneumatic guns but unlike single shot launchers they require a constant gas supply to function.

==Important & Related Links==

[[Index|Glossary/Index]]

[[BCARMS]]

[[Useful construction links]]

[[Launcher configuration]]

[[Computer Applications]]

[[IPLA|International Potato Launching Association]]

[[Safety]]

[[Ammunition]]

[[Legal issues]]

[[History]] (A Brief History of Spud Guns)

[[SpudFiles forum guidelines]]

==External links==

*[http://en.wikipedia.org/wiki/Spud_gun Wikipedia's page on spudguns]
*[http://www.bavetta.com/aircannon.html Air Cannon Barrel Length Numerical Analysis]
*[http://www.thehalls-in-bfe.com/GGDT Gas Gun Design Tool, simulation program for pneumatic guns]
*[http://www.spudfiles.com/forums/viewtopic.php?p=13324#13324 ATF Correspondence concerning spud gun legality]
*[http://www.spudfiles.com SpudFiles Forum (aka The Spud Cannon Database)]
*[http://www.BCARMS.com BCARMS - Spud Cannon Parts, Accessories, Kits and Launchers]

Main Page

2008-06-04T00:30:21Z

Davidvaini: /* Types of Spudguns */

== The Spudding Handbook ==
Welcome to The Spudding Handbook! This wiki format handbook contains all of the information you will ever need to build spudguns, and much more besides. The purpose of this handbook is to explain the principles of spudguns and how they are built and operated. All of the information contained in this handbook is free and available to anybody who wishes to view it.

Look around and enjoy your stay.
--[[User:BC Pneumatics|BC Pneumatics]] 02:13, 31 May 2008 (EDT)
[[Image:Cannon.jpg|frame|An Advanced Combustion Cannon]]
==What is a Spudgun?==
''Main article: [[What_is_a_spudgun%3F|What is a spudgun?]]''

There are many different names for spudguns. They are called potato cannons, spud launchers, potato guns, spud cannons, and a host of others. Whatever you decide to call it, all of the aforementioned describe the same type of device: a device used to accelerate a potato down the barrel, and launch it some distance. While it may offend some purists, the humble little potato is quickly losing favour to other ammunitions such as golf balls, tennis balls, and other cheap, uniform projectiles.

==Types of Spudguns==

=== [[Pneumatic_launcher|Pneumatic Launchers]] ===

These use the energy stored in compressed gas to launch a projectile. The launchers chamber is pressurised and the gas held back from the barrel by a valve. When the valve is opened the gas is allowed to rapidly expand and escape down the barrel forcing the projectile out before it.

=== Combustion Launchers ===

* '''[[Combustion_launcher|Regular Combustions]]'''

These find the energy needed to launch a projectile from the combustion of a gaseous fuel and air mixture. The fuel is added to the air already in the chamber, the chamber is sealed and the mixture ignited. This combustion creates a pressure spike that forces the projectile out through the connected barrel.

* '''[[Hybrid_launcher|Hybrid Launchers]]'''

Hybrid launchers are a special type of combustion launcher that use a pre-pressurised fuel/air mixture. This results in a higher pressure and hotter combustion on ignition, thereby transferring more energy to the projectile.

=== [[BB Machine Gun]] ===
A [[BB Machine Gun]] (BBMG) is a device designed to shoot a large volume of small diameter ammo, typically plastic airsoft or steel BBs. BBMGs are pneumatic guns but unlike single shot launchers they require a constant gas supply to function.

==Important & Related Links==

[[Index|Glossary/Index]]

[[BCARMS]]

[[Useful construction links]]

[[Launcher configuration]]

[[Computer Applications]]

[[IPLA|International Potato Launching Association]]

[[Safety]]

[[Ammunition]]

[[Legal issues]]

[[History]] (A Brief History of Spud Guns)

[[SpudFiles forum guidelines]]

==External links==

*[http://en.wikipedia.org/wiki/Spud_gun Wikipedia's page on spudguns]
*[http://www.bavetta.com/aircannon.html Air Cannon Barrel Length Numerical Analysis]
*[http://www.thehalls-in-bfe.com/GGDT Gas Gun Design Tool, simulation program for pneumatic guns]
*[http://www.spudfiles.com/forums/viewtopic.php?p=13324#13324 ATF Correspondence concerning spud gun legality]
*[http://www.spudfiles.com SpudFiles Forum (aka The Spud Cannon Database)]
*[http://www.BCARMS.com BCARMS - Spud Cannon Parts, Accessories, Kits and Launchers]

Inline Vortex BBMG

2008-06-03T17:52:42Z

Davidvaini:

Inline Vortex BBMG

2008-06-03T17:18:51Z

Davidvaini:

Currently Under Construction

*Content explaining Inline Vortex BBMG's
*Flash Video of how Inline vortex BBMG's work.

[[Image:Inlinevortexanimationgiffinal2.gif]]

Inline Vortex BBMG

2008-06-03T17:18:28Z

Davidvaini:

Currently Under Construction

*Content explaining Inline Vortex BBMG's
*Flash Video of how Inline vortex BBMG's work.

[[Image:Inlinevortexanimationgiffinal2]]

File:Inlinevortexanimationgiffinal2.gif

2008-06-03T17:17:23Z

Davidvaini: New and updated Inline Vortex Animation

New and updated Inline Vortex Animation

File:Animation0129353.gif

2008-06-03T17:15:34Z

Davidvaini:

Inline Vortex BBMG

2008-06-03T05:03:03Z

Davidvaini:

Currently Under Construction

*Content explaining Inline Vortex BBMG's
*Flash Video of how Inline vortex BBMG's work.

[[Image:Inlinevortexanimation]]

Inline Vortex BBMG

2008-06-03T03:10:28Z

Davidvaini: New page: Currently Under Construction *Content explaining Inline Vortex BBMG's *Flash Video of how Inline vortex BBMG's work.

Currently Under Construction

*Content explaining Inline Vortex BBMG's
*Flash Video of how Inline vortex BBMG's work.

Vortex cap

2008-06-03T02:54:40Z

Davidvaini: Vortex cap moved to Vortex cap BBMG: to match the other bbmg titles.

#REDIRECT [[Vortex cap BBMG]]

Vortex cap BBMG

2008-06-03T02:54:40Z

Davidvaini: Vortex cap moved to Vortex cap BBMG: to match the other bbmg titles.

BB machine gun

2008-06-03T02:53:40Z

Davidvaini: /* Common Designs */

A '''BB Machine Gun''' (BBMG) is a device designed to shoot a large volume of small diameter [[ammo]], typically plastic airsoft or steel BBs. BBMGs are pneumatic guns but unlike single shot [[pneumatic launcher|launchers]] they require a constant gas supply to function. The common use of a large air [[compressor]] restricts mobility for the majority of BBMGs although models using CO<sub>2</sub> systems have been successfully built as portable units.

== Common Designs ==

* A [[Cloud BBMG]] agitates the BBs in the ammunition chamber by means of the air inlet blowing upwards through them. The agitated BBs then get sucked into the [[barrel]] with the outgoing air stream.

* A [["T" vortex BBMG]] housed inside of the bottom of a T, uses the air inlet to swirl the BBs around a circular or semi-circular cutout in a block placed in the BB chamber and out through a BB sized hole in its side leading to the barrel.

* An [[Inline Vortex BBMG]] uses the same vortex block from above however the block is housed inside a straight pipe. Normally Inline Vortex BBMG's have a spring/plunger system that forces the BB's into the vortex block to allow firing from any angle without agitation.

* A [[Vortex cap BBMG]] works on an identical principle to a vortex block but instead of a cut-out in a block placed within a large BB chamber it uses the circular internals of a pipe endcap in which to swirl the BBs allowing for a smaller diameter chamber. This potentially allows for a smaller overall design. It was designed by Gatorlangman AKA DavidVaini.

== Design Characteristics ==

The performance of a BBMG, as with any gun, depends on specific characteristics. For BBMGs, perhaps the most important are;

* Air supply [[pressure]]
* Sustainability of the supply pressure
* Air flow from supply to barrel
* Barrel length
* The fit of the BBs in the barrel

Most of the characteristics that make a good pneumatic spudgun also apply to BBMGs. As with any pneumatic gun, the higher the reservoir pressure and the longer the barrel (up to a point) the greater the [[muzzle velocity]]. Because of the large amount of compressed gas that is wasted in a typical BBMG, the air supply needs to be fairly substantial. For air supplies with a resevoir such as compressors this can mean [[CB ratio]]s of 100:1 to 1000:1. Note that, for a BBMG, the "[[chamber]] volume" includes the volume of the compressor's reservoir.

The BBs should fit the barrel well enough to minimize leakage of air around the ammo ([[blowby]]) but not so tightly that friction is excessive.

The chambering and firing of BBs in a cloud BBMG appears to be a coupled process. Usually, when a BB is passing through the barrel the reduced air flow through the gun inhibits the loading of the next BB into the barrel. When the first BB leaves the barrel the increase in air flow "chambers" the next BB. As a result it appears that there is rarely more than one BB in the barrel at a time. This suggests that the muzzle velocity and ROF of cloud BBMGs are linked. The ROF for a gun would appear to be often very close to the reciprocal of the barrel transit time for a BB.

For example, a 3 foot barrel that fires at 300 FPS has an average barrel velocity of ~150 FPS and a transit time of ~20mS. The ROF would be expected to be about 1/20mS = 50 RPS. Design changes that alter the transit time would be expected to also change the ROF. When adding the feeding system of a vortex block this becomes less of a problem because vortex blocks are more of a forced air system rather than a suction system such as cloud BBMGs.

== Typical Performance ==

The rate of fire for the average gun is very high, in the vicinity of 30 to 100 rounds per second (RPS), 1800 to 6000 rounds per minute, comparable to that of a [http://en.wikipedia.org/wiki/Minigun Minigun] which clocks in at 33~66 RPS.

BBMGs in general are not usually capable of sustained full performance fire as most air sources cannot provide an adequate flow of sufficiently high pressure air. To reduce air consumption, maintain muzzle velocity and to reduce the rate that the ammunition is expended they are typically fired in short bursts lasting a few seconds at most.

'''Airsoft BBMG Performance'''

Airsoft BBMGs are known for their especially high rate of fire. This is in the region of 30 to 115 rounds per second (RPS), 1800 to 6900 rounds per minute. This is useful in Airsoft skirmishes for laying down suppressive fire or clearing out multiple targets up close. The projectile speeds of around 250-400 Feet Per Second(FPS) are comparable to higher end Airsoft Electric Guns or AEGs. The advantage of the high ROF is quite clear in skirmishes however the consumption of such a high volume of pellets can be expensive.

Other disadvantages of using BBMGs in airsoft lies in their portability and range. Portability can be fixed by using an external CO<sub>2</sub> setup for the gas supply however it can be costly. The other problem of range is due to the lack of a hop-up system which creates backspin on the BB and so increase the distance they can fly. Although possible to add a hop-up they wear down quickly because of the high ROF.

'''Non-Airsoft BBMG Performance'''

These BBMGs are unregulated by airsoft limitations of plastic pellets as they are not intended to be fired at other people.

With 3 foot length of 1/4" OD (3/16" ID) stainless steel tubing, a 120 PSIG 3 gallon shop compressor and firing standard copper or steel BBs, a typical vortex BBMG has a muzzle velocity of about [http://www.inpharmix.com/jps/Jims_chrono.html 330 FPS]. This is about the same as a cheap commercial single shot BB gun. The muzzle energy for an 0.177" metal BB (0.33g) at 330 FPS is 1.2 foot-pounds (1.7J). Despite the relatively low projectile speed, the abrasive effects of a large number of hard BBs striking a target in a short period of time can be quite destructive.

The high ROF can consume pellets at an expensive rate. A six pound container of 6000 metal BBs costs about $15. At 50 RPS that six pound container will last for two minutes of firing.

== Links ==
[http://www.burntlatke.com/bb.html Latke's BBMG]: An excellent write-up on how to build a Vortex BBMG.

Talk:Cloud chamber

2008-06-03T02:53:07Z

Davidvaini: Talk:Cloud chamber moved to Talk:Cloud BBMG: To match the titles of the other BBMG titles.

#REDIRECT [[Talk:Cloud BBMG]]

Talk:Cloud BBMG

2008-06-03T02:53:07Z

Davidvaini: Talk:Cloud chamber moved to Talk:Cloud BBMG: To match the titles of the other BBMG titles.

First link is broken

Cloud chamber

2008-06-03T02:53:07Z

Davidvaini: Cloud chamber moved to Cloud BBMG: To match the titles of the other BBMG titles.

#REDIRECT [[Cloud BBMG]]

Cloud BBMG

2008-06-03T02:53:07Z

Davidvaini: Cloud chamber moved to Cloud BBMG: To match the titles of the other BBMG titles.

A '''cloud chamber [[BB machine gun]]''', or BBMG, works by blowing air up through a mass of BBs (BBs are small plastic or metal balls). This makes a "cloud" of BBs inside the [[chamber]] in which the BBs move around at random, and occasionally get near enough to the entrance to the [[barrel]] to be sucked in.

The actual cloud chamber is typically built within a short length of small diameter pipe, such as a couple inch segment of 1.25" sch 40 pipe. More detailed descriptions can be found [http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=11115 here]
However, cloud chamber launchers [http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=8085 have been built] to accept [[ammo]] up to 3/4" projectiles.

A cloud chamber BBMG typically gets rates of fire of about 50 projectiles per second, which is at least as good as the [[vortex block]] style of construction.

Tee vortex BBMG

2008-06-03T02:49:42Z

Davidvaini:

Vortex block

2008-06-03T02:48:43Z

Davidvaini: Vortex block moved to "T" vortex BBMG: Better title because all of the information is about a vortex block housed inside of a "T".

#REDIRECT [["T" vortex BBMG]]