Chamber fan - Revision history

Niglch: /* Purposes */

2009-06-12T00:20:45Z

Purposes

← Older revision		Revision as of 19:20, 11 June 2009
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	*Inducing turbulence		*Inducing turbulence

	~~Their~~ main purpose of ~~increasing cannon performance~~ is '''mixing''' the air or [[oxygen]] with the [[fuel]]. ~~This creates~~ an even ~~mix~~ and significantly increases performance. Unmixed chambers may have ~~way too much~~ fuel ~~on one side~~ of the [[chamber]], ~~while~~ a lack of fuel ~~exists on the other side~~. The chamber fan fixes this and ~~helps having~~ a good [[stoichiometry]] throughout the chamber.		The main purpose of a chamber fan is '''mixing''' the air or [[oxygen]] with the [[fuel]]. The fan ensures an even distribution of fuel throughout the chamber which results in a more efficient combusiton and significantly increases performance. Unmixed chambers may have an excess of fuel in some areas of the [[chamber]], and a lack of fuel in others. The chamber fan fixes this problem and maintains a good [[stoichiometry]] throughout the chamber.

	Another purpose is '''venting'''. After each shot the burnt fuel mixture needs to ~~get out of~~ the ~~cannon~~ and fresh air ~~needs to be put in~~. This is because (almost) all oxygen is used during the [[Combustion process\|combustion]] and new oxygen is needed for ~~a new~~ combustion. When the back end of the chamber is opened up using either a cap or some other system like a [[ball valve]] or quick vent plug, the fan effectively blows out ~~all air~~ and sucks in fresh air. With a chamber fan venting is done ~~much faster and~~ much more ~~reliable.~~		Another purpose is '''venting'''. After each shot the burnt fuel mixture needs to be removed from the chamber and replaced with fresh air. This is because (almost) all oxygen is used during the [[Combustion process\|combustion]] and new oxygen is needed for combustion during the next firing. When the back end of the chamber is opened using either a cap or some other system, like a [[ball valve]] or quick vent plug, the fan effectively blows out the combusted fuel and sucks in fresh air. With a chamber fan, venting is done much more quickly and reliably.

	~~The last purpose counts if the fan is on during combustion: '''turbulence''' is induced because the air inside the chamber is moving. This causes the flame front to speed up,~~ and ~~thus the combustion goes faster. This further increases the performance of the cannon~~.
	~~Theories exist tell that two smaller fans blowing in opposite directions induce more turbulence though they wont do very well on venting.~~

			If the chamber fan is left on during combustion, it has one last potential purpose: '''turbulence''' is induced because the air inside the chamber is moving. This causes the flame front to speed up, and thus the combustion occurs more rapidly. This further increases the performance of the cannon.
			Theories exist which state that two smaller fans blowing in opposite directions induce more turbulence. However, they may be less effective at venting.

	==Types of fans==		==Types of fans==

Benstern: added links, fixed spelling and grammar. added to accessories category

2008-06-04T03:32:05Z

added links, fixed spelling and grammar. added to accessories category

Psycix: Rewritten the whole page. Added ALOT of information: page is now more then 2 times as long. Also added picture.

2008-06-03T20:40:37Z

Rewritten the whole page. Added ALOT of information: page is now more then 2 times as long. Also added picture.

@@ Line 1: / Line 1: @@
-A '''chamber fan''' is a device used in [[combustion launcher|combustion]] or [[hybrid cannon|hybrid]] cannons for creating an even mixture of [[fuel]] and air within the [[chamber]], and/or [[venting]] the chamber between shots.  The commonly used fan is a CPU or case fan from a computer, these use brushless motors which do not create sparks that can ignite the fuel/air mix. A chamber fan setup also has a switch to operate the fan, and a power source such as batteries to power it. It can also be controlled automatically using a  [http://www.burntlatke.com/fan-controller.html timer circuit] which turns the fan off when it's not needed.
+[[image:Chamberfan.JPG|right|thumb|300px|A 92mm chamber fan at the back of a cannon.]]
+A '''chamber fan''' is an improvement mostly used in [[combustion cannon]]s, though [[hybrid cannon]]s sometimes also have one. The fan will improve [[muzzle velocity]], power and useability. It is a recommended upgrade and may improve the power of your cannon with 20-50%. Sometimes more then one fan is used.
-The benefits of using a chamber fan include, but are not limited to:
+For exact information on performance gains see [http://www.burntlatke.com/jpg600/fan-data.gif this latke test].
-*Mixing the fuel within the chamber to provide an even distribution.
+==Purposes==
-*Venting the chamber of exhaust gases after a shot.
+They have multiple purposes:
-*inducing turbulence into the flow containing the flame front.
+*Mixing
-The effects on cannon performance include [http://www.burntlatke.com/jpg600/fan-data.gif increased] [[muzzle velocity]], and the ability to quickly vent the chamber of exhaust gases.
+*Venting
+*Inducing turbulence
-[[Category:Accessories]]

Benstern: added link

2008-06-01T12:08:46Z

added link

← Older revision		Revision as of 07:08, 1 June 2008
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	A '''chamber fan''' is a device used in [[combustion launcher\|combustion]] or [[hybrid cannon\|hybrid]] cannons for creating an even mixture of [[fuel]] and air within the [[chamber]], and/or venting the chamber between shots. The commonly used fan is a CPU or case fan from a computer, these use brushless motors which do not create sparks that can ignite the fuel/air mix. A chamber fan setup also has a switch to operate the fan, and a power source such as batteries to power it. It can also be controlled automatically using a [http://www.burntlatke.com/fan-controller.html timer circuit] which turns the fan off when it's not needed.		A '''chamber fan''' is a device used in [[combustion launcher\|combustion]] or [[hybrid cannon\|hybrid]] cannons for creating an even mixture of [[fuel]] and air within the [[chamber]], and/or [[venting]] the chamber between shots. The commonly used fan is a CPU or case fan from a computer, these use brushless motors which do not create sparks that can ignite the fuel/air mix. A chamber fan setup also has a switch to operate the fan, and a power source such as batteries to power it. It can also be controlled automatically using a [http://www.burntlatke.com/fan-controller.html timer circuit] which turns the fan off when it's not needed.

	The benefits of using a chamber fan include, but are not limited to:		The benefits of using a chamber fan include, but are not limited to:

Benstern: spelling

2007-06-05T17:05:39Z

spelling

← Older revision		Revision as of 12:05, 5 June 2007
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	*Mixing the fuel within the chamber to provide an even distribution.		*Mixing the fuel within the chamber to provide an even distribution.
	*Venting the chamber of exhaust gases after a shot.		*Venting the chamber of exhaust gases after a shot.
	*inducing turbulence into the flow ~~contaning~~ the flame front.		*inducing turbulence into the flow containing the flame front.

	The effects on cannon performance include [http://www.burntlatke.com/jpg600/fan-data.gif increased] [[muzzle velocity]], and the ability to quickly vent the chamber of exhaust gases.		The effects on cannon performance include [http://www.burntlatke.com/jpg600/fan-data.gif increased] [[muzzle velocity]], and the ability to quickly vent the chamber of exhaust gases.

	[[Category:Accessories]]		[[Category:Accessories]]

Benstern at 20:27, 18 March 2006

2006-03-18T20:27:09Z

← Older revision		Revision as of 15:27, 18 March 2006
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	A '''chamber fan''' is a device used in [[combustion launcher\|combustion]] or [[hybrid cannon\|hybrid]] cannons for creating an even mixture of fuel and air within the chamber, and/or venting the chamber between shots. The commonly used fan is a CPU or case fan from a computer, these use brushless motors which do not create sparks that can ignite the fuel/air mix. A chamber fan setup also has a switch to operate the fan, and a power source such as batteries to power it. It can also be controlled automatically using a [http://www.burntlatke.com/fan-controller.html timer circuit] which turns the fan off when it's not needed.		A '''chamber fan''' is a device used in [[combustion launcher\|combustion]] or [[hybrid cannon\|hybrid]] cannons for creating an even mixture of [[fuel]] and air within the [[chamber]], and/or venting the chamber between shots. The commonly used fan is a CPU or case fan from a computer, these use brushless motors which do not create sparks that can ignite the fuel/air mix. A chamber fan setup also has a switch to operate the fan, and a power source such as batteries to power it. It can also be controlled automatically using a [http://www.burntlatke.com/fan-controller.html timer circuit] which turns the fan off when it's not needed.

	The benefits of using a chamber fan include, but are not limited to:		The benefits of using a chamber fan include, but are not limited to:

GalFisk: +brushless info, formatting

2006-03-15T16:48:11Z

+brushless info, formatting

← Older revision		Revision as of 11:48, 15 March 2006
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	A chamber fan is a device used in [[combustion launcher\|combustion]] or [[hybrid cannon\|hybrid]] cannons ~~to create~~ an even mixture of fuel within the chamber. ~~A chamber~~ fan ~~system usually consists of~~ a CPU or case fan from a computer, a switch to operate the fan, and a power source such as batteries to power ~~the chamber fan~~. ~~The fan is usually~~ controlled ~~manually by a switch but sometimes~~ a [http://www.burntlatke.com/fan-controller.html timer circuit] ~~is employed to automatically turn~~ the fan off when not needed.		A '''chamber fan''' is a device used in [[combustion launcher\|combustion]] or [[hybrid cannon\|hybrid]] cannons for creating an even mixture of fuel and air within the chamber, and/or venting the chamber between shots. The commonly used fan is a CPU or case fan from a computer, these use brushless motors which do not create sparks that can ignite the fuel/air mix. A chamber fan setup also has a switch to operate the fan, and a power source such as batteries to power it. It can also be controlled automatically using a [http://www.burntlatke.com/fan-controller.html timer circuit] which turns the fan off when it's not needed.

	The benefits of using a chamber fan include, but are not limited to:		The benefits of using a chamber fan include, but are not limited to:
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	*Mixing the fuel within the chamber to provide an even distribution.		*Mixing the fuel within the chamber to provide an even distribution.
	*Venting the chamber of exhaust gases after a shot.		*Venting the chamber of exhaust gases after a shot.
	*inducing ~~turbulance~~ into the flow contaning the flame front		*inducing turbulence into the flow contaning the flame front.

	The effects on cannon performance include [http://www.burntlatke.com/jpg600/fan-data.gif increased] [[muzzle velocity]], and the ability to quickly vent the chamber of exhaust gases.		The effects on cannon performance include [http://www.burntlatke.com/jpg600/fan-data.gif increased] [[muzzle velocity]], and the ability to quickly vent the chamber of exhaust gases.

	[[Category:Accessories]]		[[Category:Accessories]]

Benstern at 04:19, 21 December 2005

2005-12-21T04:19:20Z

← Older revision		Revision as of 23:19, 20 December 2005
Line 5:		Line 5:
	*Mixing the fuel within the chamber to provide an even distribution.		*Mixing the fuel within the chamber to provide an even distribution.
	*Venting the chamber of exhaust gases after a shot.		*Venting the chamber of exhaust gases after a shot.
			*inducing turbulance into the flow contaning the flame front

	The effects on cannon performance include [http://www.burntlatke.com/jpg600/fan-data.gif increased] [[muzzle velocity]], and the ability to quickly vent the chamber of exhaust gases.		The effects on cannon performance include [http://www.burntlatke.com/jpg600/fan-data.gif increased] [[muzzle velocity]], and the ability to quickly vent the chamber of exhaust gases.

			[[Category:Accessories]]

Boilingleadbath: internal linkage

2005-10-22T02:23:43Z

internal linkage

← Older revision		Revision as of 21:23, 21 October 2005
Line 1:		Line 1:
	A chamber fan is a device used in combustion or hybrid cannons to create an even mixture of fuel within the chamber. A chamber fan system usually consists of a CPU or case fan from a computer, a switch to operate the fan, and a power source such as batteries to power the chamber fan. The fan is usually controlled manually by a switch but sometimes a [http://www.burntlatke.com/fan-controller.html timer circuit] is employed to automatically turn the fan off when not needed.		A chamber fan is a device used in [[combustion launcher\|combustion]] or [[hybrid cannon\|hybrid]] cannons to create an even mixture of fuel within the chamber. A chamber fan system usually consists of a CPU or case fan from a computer, a switch to operate the fan, and a power source such as batteries to power the chamber fan. The fan is usually controlled manually by a switch but sometimes a [http://www.burntlatke.com/fan-controller.html timer circuit] is employed to automatically turn the fan off when not needed.

	The benefits of using a chamber fan include, but are not limited to:		The benefits of using a chamber fan include, but are not limited to:

Boilingleadbath: case fans too!

2005-10-22T02:22:14Z

case fans too!

← Older revision		Revision as of 21:22, 21 October 2005
Line 1:		Line 1:
	A chamber fan is a device used in combustion or hybrid cannons to create an even mixture of fuel within the chamber. A chamber fan system usually consists of a CPU fan from a computer, a switch to operate the fan, and a power source such as batteries to power the chamber fan. The fan is usually controlled manually by a switch but sometimes a [http://www.burntlatke.com/fan-controller.html timer circuit] is employed to automatically turn the fan off when not needed.		A chamber fan is a device used in combustion or hybrid cannons to create an even mixture of fuel within the chamber. A chamber fan system usually consists of a CPU or case fan from a computer, a switch to operate the fan, and a power source such as batteries to power the chamber fan. The fan is usually controlled manually by a switch but sometimes a [http://www.burntlatke.com/fan-controller.html timer circuit] is employed to automatically turn the fan off when not needed.

	The benefits of using a chamber fan include, but are not limited to:		The benefits of using a chamber fan include, but are not limited to:

← Older revision		Revision as of 22:32, 3 June 2008
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	[[image:Chamberfan.JPG\|right\|thumb\|300px\|A 92mm chamber fan at the back of a cannon.]]		[[image:Chamberfan.JPG\|right\|thumb\|300px\|A 92mm chamber fan at the back of a cannon.]]
	A '''chamber fan''' is an improvement mostly used in [[combustion cannon]]s, though [[hybrid cannon]]s sometimes also have one. The fan will improve [[muzzle velocity]], power and ~~useability~~. It is a recommended upgrade and may improve the power of your cannon with 20-50%. Sometimes more then one fan is used.		A '''chamber fan''' is an improvement mostly used in [[combustion cannon]]s, though [[hybrid cannon]]s sometimes also have one. The fan will improve [[muzzle velocity]], power and usability. It is a recommended upgrade and may improve the power of your cannon with 20-50%. Sometimes more then one fan is used.
	For exact information on performance gains see [http://www.burntlatke.com/jpg600/fan-data.gif this latke test].		For exact information on performance gains see [http://www.burntlatke.com/jpg600/fan-data.gif this latke test].

Line 7:		Line 7:

	*Mixing		*Mixing
	*Venting		*[[Venting]]
	*Inducing turbulence		*Inducing turbulence

	Their main purpose of increasing cannon performance is '''mixing''' the air or [[oxygen]] with the [[fuel]]. This creates an even mix and significantly increases performance. Unmixed chambers may have way too much fuel on one side of the [[chamber]], while a lack of fuel exists on the other side. The chamber fan fixes this and helps having a good [[stoichiometry]] throughout the chamber.		Their main purpose of increasing cannon performance is '''mixing''' the air or [[oxygen]] with the [[fuel]]. This creates an even mix and significantly increases performance. Unmixed chambers may have way too much fuel on one side of the [[chamber]], while a lack of fuel exists on the other side. The chamber fan fixes this and helps having a good [[stoichiometry]] throughout the chamber.

	Another purpose is '''venting'''. After each shot the burnt fuel mixture needs to get out of the cannon and fresh air needs to be put in. This is because (almost) all oxygen is used ~~for~~ the combustion and new oxygen is needed for a new combustion. When the back end of the chamber is opened up using either a cap or some other system like a [[ball valve~~\|ballvalve~~]] or quick vent plug, the fan effectively blows out all air and sucks in fresh air. With a chamber fan venting is done much faster and much more reliable.		Another purpose is '''venting'''. After each shot the burnt fuel mixture needs to get out of the cannon and fresh air needs to be put in. This is because (almost) all oxygen is used during the [[Combustion process\|combustion]] and new oxygen is needed for a new combustion. When the back end of the chamber is opened up using either a cap or some other system like a [[ball valve]] or quick vent plug, the fan effectively blows out all air and sucks in fresh air. With a chamber fan venting is done much faster and much more reliable.

	The last purpose counts if the fan is on during combustion: '''turbulence''' is induced because the air inside the chamber is moving. This causes the flame front to speed up, and thus the combustion goes faster. This further increases the performance of the cannon.		The last purpose counts if the fan is on during combustion: '''turbulence''' is induced because the air inside the chamber is moving. This causes the flame front to speed up, and thus the combustion goes faster. This further increases the performance of the cannon.
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	The most commonly used fans are case fans out of computers. The corners may be sanded down so it fits in the chamber, and sometimes the complete frame around the fan is cut off and even the fan blades need to be cut for fitting it into in small chambers.		The most commonly used fans are case fans out of computers. The corners may be sanded down so it fits in the chamber, and sometimes the complete frame around the fan is cut off and even the fan blades need to be cut for fitting it into in small chambers.
	Instead of PC fans you could also use any other electric motor with fan blades attached. However, you should avoid brushed motors at all times. PC fans have brushless motors and thus do not create any sparks within. A brushed motor could spark with the possibility of suddenly igniting the fuel mixture, ~~wich~~ can lead to accidents damaging the environment or even harming people. So now and then someone still uses a brushed engine but sealed the holes in the housing off with glue, making no fuel enter the insides of the engine. The engine wont be able to cool itself anymore, but when used in short periods, that doesn't really matter.		Instead of PC fans you could also use any other electric motor with fan blades attached. However, you should avoid brushed motors at all times. PC fans have brushless motors and thus do not create any sparks within. A brushed motor could spark with the possibility of suddenly igniting the fuel mixture, which can lead to [[safety\|accidents]] damaging the environment or even harming people. So now and then someone still uses a brushed engine but sealed the holes in the housing off with glue, making sure no fuel can enter the insides of the engine. The engine wont be able to cool itself anymore, but when used in short periods, that doesn't really matter.

	Since PC fans are cheap, brushless and readily available in various sizes, this is the choice of most spudders and the most recommended option.		Since PC fans are cheap, brushless and readily available in various sizes, this is the choice of most spudders and the most recommended option.
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	'''Powering the fan'''		'''Powering the fan'''

	Nearly all fans are powered by a pack of batteries. A 12V fan can be ran off a single 9V battery (though it will not run at full power) or a bunch of 8 1.5V batteries. It is also useful to have a switch to turn the fan on and off. It can also be controlled automatically using a [http://www.burntlatke.com/fan-controller.html timer circuit] which turns the fan off when it's not needed. For a ~~goodlooking~~ cannon without duct tape and wires all over it, you build all the fan circuitry and batteries into a fan control box. Since the same can be done with ignition systems in a ignition control box, some people merge it together into one fan/ignition control box. This gives the advantage of running a fan and a stungun from the same batteries, saving space and weight. Sometimes this box is built in the handle for an even cleaner look not showing any wires.		Nearly all fans are powered by a pack of batteries. A 12V fan can be ran off a single 9V battery (though it will not run at full power) or a bunch of 8 1.5V batteries. It is also useful to have a switch to turn the fan on and off. It can also be controlled automatically using a [http://www.burntlatke.com/fan-controller.html timer circuit] which turns the fan off when it's not needed. For a good looking cannon without duct tape and wires all over it, you build all the fan circuitry and batteries into a fan control box. Since the same can be done with ignition systems in a ignition control box, some people merge it together into one fan/ignition control box. This gives the advantage of running a fan and a [[stungun]] from the same batteries, saving space and weight. Sometimes this box is built in the handle for an even cleaner look not showing any wires.

	'''Mounting & wiring the fan'''		'''Mounting & wiring the fan'''

	The easiest way of doing this is having a PC fan ~~wich~~ is a bit too large. Sand down the corners until it fits in tight and squeeze it in. The fan will stay in place due to friction. Glue can be used to secure the fans and sometimes bolts are used too.		The easiest way of doing this is having a PC fan which is a bit too large. Sand down the corners until it fits in tight and squeeze it in. The fan will stay in place due to friction. Glue can be used to secure the fans and sometimes bolts are used too.

	Since the batteries and possibly switch are outside the chamber while the fan is inside, you will need to get those two wires to the fan someway.		Since the batteries and possibly switch are outside the chamber while the fan is inside, you will need to get those two wires to the fan someway.
	A ~~leakless~~ way of doing so is screwing in two bolts trough the chamber wall (preferably drill ~~trough~~ pipe+fitting so you've got two layers of PVC/ABS.) Then attach the wires on the in and the outside to the bolts and your done.		A leak free way of doing so is screwing in two bolts trough the chamber wall (preferably drill through both the pipe and fitting so you've got two layers of PVC/ABS.) Then attach the wires on the inside and the outside to the bolts and your done.

	'''Fan placement'''		'''Fan placement'''

	It is not recommended to place the fan too much near the barrel opening. Remember that all air behind the fan wants to go past it and if that is too much you will constrict flow to the barrel and most importantly: your fan will probably break. Most fans are at the back of the chamber so they can easily be taken out for service on the chamber or the fan. Note that you cant take a fan out when the electrode bolts are in the way.		It is not recommended to place the fan too much near the [[barrel]] opening. Remember that all air behind the fan wants to go past it and if that is too much you will constrict flow to the barrel and most importantly: your fan will probably break. Most fans are at the back of the chamber so they can easily be taken out for service on the chamber or the fan. Note that you cant take a fan out when the electrode bolts are in the way.

	==Will my fan survive the combustion?==		==Will my fan survive the combustion?==

	If you think that your fan might get burned or melt, ~~dont~~ worry, it wont. Since the heat in the combustion chamber lasts no more then a few milliseconds the fan doesn't have time to heat up or melt. As stated above, your fan should not be too close to the barrel. If its more to the back, it wont get blown to pieces due to the extreme flow.		If you think that your fan might get burned or melt, don't worry, it wont. Since the heat in the combustion chamber lasts no more then a few milliseconds the fan doesn't have time to heat up or melt. As stated above, your fan should not be too close to the barrel. If its more to the back, it wont get blown to pieces due to the extreme flow.

	A fan may have a somewhat shortened lifespan inside a combustion chamber, but it still can survive for many years. So for combustion cannons: Yes, your fan will survive.		A fan may have a somewhat shortened lifespan inside a combustion chamber, but it still can survive for many years. So for combustion cannons: Yes, your fan will survive.

	In hybrids fans last shorter due to the more extreme environment. High-mix hybrids can break their fans on the first shot. Luckily, those hybrids ~~dont~~ need fans anyway. When you pressurize the fuel mixture with air after you have put in the fuel, the blow-in of air already mixes the fuel. Also because of DDT dangers you ~~dont~~ want to have turbulence anyway.		In hybrids fans last shorter due to the more extreme environment. High-mix hybrids can break their fans on the first shot. Luckily, those hybrids don't need fans anyway. When you pressurize the fuel mixture with air after you have put in the fuel, the blow-in of air already mixes the fuel. Also because of [[DDT]] dangers you don't want to have turbulence anyway.

			[[Category:Accessories]]