Index - Revision history

Benstern: fixed links

2008-06-04T10:23:43Z

fixed links

← Older revision		Revision as of 05:23, 4 June 2008
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	[[BB Machine Gun]] - Pneumatic gun designed to fire airsoft pellets or metal BBs at high rates of fire.		[[BB Machine Gun]] - Pneumatic gun designed to fire airsoft pellets or metal BBs at high rates of fire.

	Bottled Gas - See [[Gas ~~Bottle~~]]		Bottled Gas - See [[Gas bottle]]

	[[Butane]] - A common fuel for combustion spud guns. Butane, a gas at room termperature and pressure, is readily available in disposable lighters.		[[Butane]] - A common fuel for combustion spud guns. Butane, a gas at room termperature and pressure, is readily available in disposable lighters.
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	[[Valve]] - Essential to pneumatic cannons. A valve retains pressure and then opens, or in the case of a burst disk, ruptures, to release the air. A valve will perform better if its flow rate is increased, or its opening speed is decreased.		[[Valve]] - Essential to pneumatic cannons. A valve retains pressure and then opens, or in the case of a burst disk, ruptures, to release the air. A valve will perform better if its flow rate is increased, or its opening speed is decreased.

	[[Vortex ~~Cap~~]] - 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 Davidvaini and provides a small substitute to the standard vortex or inline vortex blocks.		[[Vortex cap]] - 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 Davidvaini and provides a small substitute to the standard vortex or inline vortex blocks.

	==W==		==W==

Davidvaini: /* V */

2008-05-21T04:56:26Z

← Older revision		Revision as of 23:56, 20 May 2008
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	[[Valve]] - Essential to pneumatic cannons. A valve retains pressure and then opens, or in the case of a burst disk, ruptures, to release the air. A valve will perform better if its flow rate is increased, or its opening speed is decreased.		[[Valve]] - Essential to pneumatic cannons. A valve retains pressure and then opens, or in the case of a burst disk, ruptures, to release the air. A valve will perform better if its flow rate is increased, or its opening speed is decreased.

	Vortex Cap - 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 Davidvaini and provides a small substitute to the standard vortex or inline vortex blocks.		[[Vortex Cap]] - 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 Davidvaini and provides a small substitute to the standard vortex or inline vortex blocks.

	==W==		==W==

Davidvaini: /* V */

2008-05-21T04:55:49Z

← Older revision		Revision as of 23:55, 20 May 2008
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	==V==		==V==
	[[Valve]] - Essential to pneumatic cannons. A valve retains pressure and then opens, or in the case of a burst disk, ruptures, to release the air. A valve will perform better if its flow rate is increased, or its opening speed is decreased.		[[Valve]] - Essential to pneumatic cannons. A valve retains pressure and then opens, or in the case of a burst disk, ruptures, to release the air. A valve will perform better if its flow rate is increased, or its opening speed is decreased.

			Vortex Cap - 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 Davidvaini and provides a small substitute to the standard vortex or inline vortex blocks.

	==W==		==W==

Pilgrimman: /* S */

2008-04-29T03:24:40Z

← Older revision		Revision as of 22:24, 28 April 2008
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	Schelkin Spiral - A method that causes turbulence in burning gasses. This increases the risk of [[DDT]].		Schelkin Spiral - A method that causes turbulence in burning gasses. This increases the risk of [[DDT]].

	[[Spark_gap\|Spark Gap]] - A spark gap consists of two metal electrodes placed close to each other with a gap in between, where an electrical spark can jump. They are used for igniting the fuel in combustion and hybrid cannons.		[[Spark_gap\|Spark Gap]] - A spark gap consists of two metal electrodes placed close to each other with a gap in between, where an electrical spark can jump. They are used for igniting the fuel in combustion and hybrid cannons. Electrodes that are more pointed can generate a longer spark at a given voltage than those that are more planar.

	==T==		==T==

Jimmy101: /* S */

2008-03-15T17:12:43Z

← Older revision		Revision as of 12:12, 15 March 2008
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	Schelkin Spiral - A method that causes turbulence in burning gasses. This increases the risk of [[DDT]].		Schelkin Spiral - A method that causes turbulence in burning gasses. This increases the risk of [[DDT]].

	[[Spark Gap]] - A spark gap consists of two metal electrodes placed close to each other with a gap in between, where an electrical spark can jump. They are used for igniting the fuel in combustion and hybrid cannons.		[[Spark_gap\|Spark Gap]] - A spark gap consists of two metal electrodes placed close to each other with a gap in between, where an electrical spark can jump. They are used for igniting the fuel in combustion and hybrid cannons.

	==T==		==T==

Jimmy101: /* S */ Spark Gap

2008-03-15T17:11:42Z

S: Spark Gap

← Older revision		Revision as of 12:11, 15 March 2008
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	Schelkin Spiral - A method that causes turbulence in burning gasses. This increases the risk of [[DDT]].		Schelkin Spiral - A method that causes turbulence in burning gasses. This increases the risk of [[DDT]].

			[[Spark Gap]] - A spark gap consists of two metal electrodes placed close to each other with a gap in between, where an electrical spark can jump. They are used for igniting the fuel in combustion and hybrid cannons.

	==T==		==T==

Jimmy101: /* B */ Ballistics

2008-03-15T17:10:19Z

B: Ballistics

← Older revision		Revision as of 12:10, 15 March 2008
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	==B==		==B==

			Ballistics - The science of the motion of projectiles. Sometime divided into two sub-classes; "Internal Ballistics" is the motion of the projectile while it is still in the barrel, "External Ballistics" is the motion of the projectile after it has left the barrel.

	[[Barrel]] - Present on all cannons. A barrel is a tube designed to allow the projectile to reach maximum velocity before the pressurized gas propelling it escapes to the atmosphere. Barrels also improve accuracy, and can be rifled to improve accuracy further.		[[Barrel]] - Present on all cannons. A barrel is a tube designed to allow the projectile to reach maximum velocity before the pressurized gas propelling it escapes to the atmosphere. Barrels also improve accuracy, and can be rifled to improve accuracy further.

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	Bottled Gas - See [[Gas Bottle]]		Bottled Gas - See [[Gas Bottle]]

	[[Butane]] - A common fuel for combustion spud guns.		[[Butane]] - A common fuel for combustion spud guns. Butane, a gas at room termperature and pressure, is readily available in disposable lighters.

	==C==		==C==

Jimmy101: /* M */ Added more info about temperature dependence for the speed of sound

2008-03-09T19:14:31Z

M: Added more info about temperature dependence for the speed of sound

← Older revision		Revision as of 14:14, 9 March 2008
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	==M==		==M==

	Mach - The speed of sound for a given set of environmental conditions. The speed of sound changes ~~somewhat~~ with temperature and the nature of the fluid involved. For dry air at 15C, one Mach is equivalent to 340.3 m/s (~~1,225~~ km/h, 761.2 mph)		Mach - The speed of sound for a ''given set of environmental conditions''. The speed of sound changes with temperature and the nature of the fluid involved. For dry air at 15C, one Mach is equivalent to 340.3 m/s (1225 km/h, 761.2 mph, 1116 fps). At normal temperatures the small temperature dependence is usually ignored. At the elevated temperatures that exist in the chamber of a combustion gun, the speed of sound is significantly increased. At the adiabatic flame temperature of propane in air the speed of sound is increased by about 3-fold to ~990 m/s (3560 km/h, 2210 mph, 3250 fps).

	MAPP - A bottled gas used in combustion or hybrid applications. MAPP has been experimentally determined to produce muzzle velocities 11% greater than those of propane.		MAPP - A bottled gas used in combustion or hybrid applications. MAPP has been experimentally determined to produce muzzle velocities 11% greater than those of propane.

Jimmy101: /* H */ Removed "The particle speed of the gas is increased by the energy of combustion, which makes supersonic velocities much more attainable." since it is irrelevant. (see discussion page)

2008-03-09T19:02:29Z

H: Removed "The particle speed of the gas is increased by the energy of combustion, which makes supersonic velocities much more attainable." since it is irrelevant. (see discussion page)

← Older revision		Revision as of 14:02, 9 March 2008
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	==H==		==H==
	[[Hybrid Cannon]] - A cannon that uses a pre-compressed flammable gas mixture. The ~~particle speed of~~ the ~~gas is increased by~~ the energy ~~of combustion, which makes supersonic velocities much more attainable~~. Ignition is somewhat difficult, as spark length is roughly inversely proportional to pressure. Very powerful, but requires experience to successfully and safely implement.		[[Hybrid Cannon]] - A cannon that uses a pre-compressed flammable gas mixture. The increased fuel + oxygen charge in the chamber substantially increases the pressure, temperature and energy in the chamber. Ignition is somewhat difficult, as spark length is roughly inversely proportional to pressure. Very powerful, but requires experience to successfully and safely implement.

	==I==		==I==

Pilgrimman: Added some terms, clarified some definitions.

2008-03-09T05:32:11Z

Added some terms, clarified some definitions.

← Older revision		Revision as of 00:32, 9 March 2008
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	==A==		==A==
			ABS (Acrylonitrile Butadiene Styrene) - A plastic used in plumbing applications. More resistant to shock, low temperature, and chemicals, but difficult to find rated for pressure. Pressure rated ABS is legal for compressed gas applications.

	==B==		==B==
	[[Barrel]] - ~~present~~ on all cannons. ~~If you don't know what one~~ is, ~~I suggest you find another hobby - or maybe click the link~~ and ~~read ''carefully''~~.		[[Barrel]] - Present on all cannons. A barrel is a tube designed to allow the projectile to reach maximum velocity before the pressurized gas propelling it escapes to the atmosphere. Barrels also improve accuracy, and can be rifled to improve accuracy further.

	BBMG - See [[BB machine gun]].		BBMG - See [[BB machine gun]].
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	[[Chronometer]] - 1. A device for measuring time. 2. A device for measuring the muzzle velocity of a gun. See also Chrony, muzzle velocity.		[[Chronometer]] - 1. A device for measuring time. 2. A device for measuring the muzzle velocity of a gun. See also Chrony, muzzle velocity.

	Chrony - A ~~comercial~~ device for measuring the muzzle velocity of a gun. Used for "real" guns, paintball guns, bows, and spud guns.		Chrony - A commercial device for measuring the muzzle velocity of a gun. Used for "real" guns, paintball guns, bows, and spud guns.

	[[Combustion Cannon]] - A cannon that generates pressure by burning flammable gases.		[[Combustion Cannon]] - A cannon that generates pressure by burning flammable gases.

	[[Compressor]] - ~~Motorised~~ air pump.		[[Compressor]] - Motorized air pump.

	[[Copper]] - Metal. Construction material.		[[Copper]] - Metal. Construction material.
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	==D==		==D==
	[[DDT]] - Deflagration to Detonation Transistion. This very dangerous effect occurs when the flame front in a combustible gas mix exceeds the speed of sound in the gas - creating a super sonic shockwave and a very large pressure spike which may damage or destroy the [[chamber]].		[[DDT]] - Deflagration to Detonation Transistion. This very dangerous effect occurs when the flame front in a combustible gas mix exceeds the speed of sound in the gas - creating a super sonic shockwave and a very large pressure spike which may damage or destroy the [[chamber]].
	It is very rare, and is only likely to occur in high mix [[Hybrid cannon]]s.		It is very rare, and is only likely to occur in high mix [[Hybrid cannon]]s, or in combustion cannons with very long chambers.

	[[Diaphragm valve]] - Related to [[Piston valve]]. Generally rarer, but often considered to open faster but have lower flow.		[[Diaphragm valve]] - Related to [[Piston valve]]. Generally rarer, but often considered to open faster but have lower flow. Typically used in coaxial designs, and commercially manufactured as inline sprinkler valves.

			Drain Waste Vent (DWV) - A designation by the NSF (National Sanitation Foundation) that means the item is approved for drain, waste, or venting applications. By nature, DWV does not require a pressure rating, but some DWV pipes are rated for pressure.

	==E==		==E==
	[[Epoxy]] - ~~Very useful material~~. Often used for sealing leaks or during sprinkler valve modification~~, or some~~ people have created very large parts of cannons from ~~them~~.		[[Epoxy]] - A combination of chemicals that form a bond much stronger than any glue. Often used for sealing leaks or during sprinkler valve modification. Some people have created very large parts of cannons from epoxy, as well as pistons.

	==F==		==F==
			Flame Front - The edge of a flame whose speed, in part, affects the power of the cannon it is powering. If the flame front exceeds the speed of sound, [[DDT]] occurs.

	==G==		==G==
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	==H==		==H==
	[[Hybrid Cannon]] - A cannon that uses a pre-compressed flammable gas mixture. Very powerful, but requires experience to successfully and safely implement.		[[Hybrid Cannon]] - A cannon that uses a pre-compressed flammable gas mixture. The particle speed of the gas is increased by the energy of combustion, which makes supersonic velocities much more attainable. Ignition is somewhat difficult, as spark length is roughly inversely proportional to pressure. Very powerful, but requires experience to successfully and safely implement.

	==I==		==I==

	[[Ignition source]] - Used to start the combustion reaction in a [[combustion cannon]]		[[Ignition source]] - Used to start the combustion reaction in a [[combustion cannon]] or [[Hybrid Cannon]]. Sources range from lantern sparkers, to piezoelectric grill ignitors, to ignition coils and camera flash circuits.

	==J==		==J==
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	==L==		==L==
			Lathe -

	==M==		==M==
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	Mach - The speed of sound for a given set of environmental conditions. The speed of sound changes somewhat with temperature and the nature of the fluid involved. For dry air at 15C, one Mach is equivalent to 340.3 m/s (1,225 km/h, 761.2 mph)		Mach - The speed of sound for a given set of environmental conditions. The speed of sound changes somewhat with temperature and the nature of the fluid involved. For dry air at 15C, one Mach is equivalent to 340.3 m/s (1,225 km/h, 761.2 mph)

	Muzzle Knife - (Aka [[~~Spud Cutter~~]].) The sharpening of the muzzle ~~(business end)~~ of a barrel so that it will automatically cut a spud to the proper size for the barrel. See also [[spud cutter]].		MAPP - A bottled gas used in combustion or hybrid applications. MAPP has been experimentally determined to produce muzzle velocities 11% greater than those of propane.

			Muzzle Knife - (Aka [[spud cutter]].) The sharpening of the muzzle of a barrel so that it will automatically cut a spud to the proper size for the barrel. Internal beveling of the muzzle can produce a better seal. See also [[spud cutter]].

	==N==		==N==
			Nitrogen - An inert gas with a lower molar mass than the average of air. This allows slightly higher particle speeds, and therefore, higher muzzle velocities.

			NSF - National Sanitation Foundation. "NSF" is often printed on pipe, along with letters that designate what applications the pipe is NSF-approved for.

	==O==		==O==
			O-Ring - Often made of Neoprene or similar, these rings can seal thousands of pounds of pressure, but must be mounted very precisely for most applications, which often requires use of a lathe.

	==P==		==P==
	[[Piston valve]] - A high power home-made valve which is generally considered to be second only to [[Burst disk]] valves in performance, but more practical to use. See also: [[Diaphragm valve]]		Piezoelectricity - A property of certain materials where the material can be mechanically stressed, and produce high voltage electric current. When electricity is applied to the crystal, it vibrates. This property is implemented in grill ignitors, which are commonly used as ignition sources in spud guns.

			Pilot Valve - A valve whose purpose is to exhaust pilot air, thus triggering a larger main valve, or, in cases, another pilot valve.

			[[Piston valve]] - A high power home-made valve which is generally considered to be second only to [[Burst disk]] valves in performance, but more practical to use. Releases air by rapidly exhausting the area behind the piston (pilot), thus causing the piston to be pushed backwards, and stop sealing the chamber from the barrel. See also: [[Diaphragm valve]]

	[[Pneumatic Cannon]] - A cannon that uses pre-compressed air for power.		[[Pneumatic Cannon]] - A cannon that uses pre-compressed air for power.

	[[Propane]] - A common fuel for combustion spud guns.		Potable Water (PW) - An NSF designation found on some plumbing pipe and fittings. Potable Water systems are pressurized, so, by nature, NSF-PW pipes are pressure rated.

			[[Propane]] - A common fuel for combustion spud guns, as well as hybrid cannons.

	[[PVC]] - Most common spudgun construction material. Gets brittle in cold weather, and may shatter if dropped or abused. ~~Quite cheap~~.		[[PVC]] - Most common spudgun construction material. Gets brittle in cold weather, and may shatter if dropped or abused. Pressure rated PVC is easy to find in the U.S., although large diameter pipe is difficult to find. PVC is illegal for compressed gas applications.

	==Q==		==Q==
	[[QEV]] - Quick Exhaust Valve. Essentially a pre-made [[piston valve\|piston]] or [[diaphragm valve]]. These are quite hard to find, and ~~typically~~ moderately expensive.		[[QEV]] - Quick Exhaust Valve. Essentially a pre-made [[piston valve\|piston]] or [[diaphragm valve]]. These are quite hard to find, and are moderately expensive.

	==R==		==R==
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	[[Safety]] - More important than even the spudgun. If you don't have this, then you need it fast.		[[Safety]] - More important than even the spudgun. If you don't have this, then you need it fast.

			Schelkin Spiral - A method that causes turbulence in burning gasses. This increases the risk of [[DDT]].

	==T==		==T==
			Tee - A name for pipe fittings that have sockets arranged so that the fitting looks like the letter "T".
	==U==		==U==

	==V==		==V==
	[[Valve]] - Essential to pneumatic cannons.		[[Valve]] - Essential to pneumatic cannons. A valve retains pressure and then opens, or in the case of a burst disk, ruptures, to release the air. A valve will perform better if its flow rate is increased, or its opening speed is decreased.

	==W==		==W==
			Wye - A name for pipe fittings that have sockets arranged so that the fitting looks like the letter "Y".

	==X==		==X==