Spark gap - Revision history

Benstern: added links and fixed spelling

2008-06-01T11:13:44Z

added links and fixed spelling

← Older revision		Revision as of 06:13, 1 June 2008
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	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 cannon\|combustion]] and [[hybrid cannon]]s. Spark gaps are normally made by screwing two screws through the side wall of the chamber so that the tips of the screws end up very close to each other. The screws should be mounted to keep the heads a good distance a part to ensure that the spark will not jump between the heads outside the chamber. The gap distance must be small enough that the voltage from the ignition source can jump across it. The distance dependence is about 1 mm/kV (25KV/inch) for sharp tipped electrodes. The distance varies with the shape of the electrodes, sharp points will spark across a larger distance for a given voltage than will dull points. For two flat surfaces the distance drops to about 0.3mm/KV (75KV/inch).		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 cannon\|combustion]] and [[hybrid cannon]]s. Spark gaps are normally made by screwing two screws through the side wall of the [[chamber]] so that the tips of the screws end up very close to each other. The screws should be mounted to keep the heads a good distance a part to ensure that the spark will not jump between the heads outside the chamber. The gap distance must be small enough that the voltage from the [[ignition source]] can jump across it. The distance dependence is about 1 mm/kV (25KV/inch) for sharp tipped electrodes. The distance varies with the shape of the electrodes, sharp points will spark across a larger distance for a given voltage than will dull points. For two flat surfaces the distance drops to about 0.3mm/KV (75KV/inch).

	The maximum spark distance is also dependent on the pressure of the gases. As the pressure is increased the gap distance a particular voltage will spark across decreases. The pressurized mixture of a hybrid will shorten the max spark length significantly, so a hybrid spark gap should be a fair bit smaller than practical spark length in air to ensure reliability. The relationship ~~beteen~~ pressure and distance is roughly linear. Increasing the pressure 10X will decrease the distance by roughly 10 fold. So, a BBQ piezo sparker that reliably sparks across a 1/8" gap in a 1X gun will only spark across an ~0.01" gap in a 10X hybrid.		The maximum spark distance is also dependent on the [[pressure]] of the gases. As the pressure is increased the gap distance a particular voltage will spark across decreases. The pressurized mixture of a hybrid will shorten the max spark length significantly, so a hybrid spark gap should be a fair bit smaller than practical spark length in air to ensure reliability. The relationship between pressure and distance is roughly linear. Increasing the pressure 10X will decrease the distance by roughly 10 fold. So, a BBQ piezo sparker that reliably sparks across a 1/8" gap in a 1X gun will only spark across an ~0.01" gap in a 10X hybrid.

	Spark plugs can be used for spark gaps, and are especially useful in metal guns, where the chamber wall would short out the screws of an ordinary spark gap.		Spark plugs can be used for spark gaps, and are especially useful in metal guns, where the chamber wall would short out the screws of an ordinary spark gap.

Jimmy101: added details about electrode radius and the pressure dependence

2008-04-29T16:26:44Z

added details about electrode radius and the pressure dependence

← Older revision		Revision as of 11:26, 29 April 2008
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	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 cannon\|combustion]] and [[hybrid cannon]]s. Spark gaps are normally made by screwing two ~~bolts~~ through the side wall of the chamber~~, at an angle~~ that ~~puts~~ the tips of the screws close ~~together~~. The screws should be mounted to keep the heads a good distance ~~apart,~~ to ensure that the spark will not jump between the heads outside the chamber. The distance must be small enough that the voltage from the ignition source can jump across it. The distance is about 1.1 mm/kV~~, this~~ varies with the shape of the electrodes ~~though~~, sharp points ~~allow longer sparks~~ than flat surfaces. ~~It should be noted that~~ the pressurized mixture of a hybrid will shorten the max spark length, so a hybrid spark gap should be a fair bit smaller than ~~max~~ spark length to ensure reliability.		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 cannon\|combustion]] and [[hybrid cannon]]s. Spark gaps are normally made by screwing two screws through the side wall of the chamber so that the tips of the screws end up very close to each other. The screws should be mounted to keep the heads a good distance a part to ensure that the spark will not jump between the heads outside the chamber. The gap distance must be small enough that the voltage from the ignition source can jump across it. The distance dependence is about 1 mm/kV (25KV/inch) for sharp tipped electrodes. The distance varies with the shape of the electrodes, sharp points will spark across a larger distance for a given voltage than will dull points. For two flat surfaces the distance drops to about 0.3mm/KV (75KV/inch).

			The maximum spark distance is also dependent on the pressure of the gases. As the pressure is increased the gap distance a particular voltage will spark across decreases. The pressurized mixture of a hybrid will shorten the max spark length significantly, so a hybrid spark gap should be a fair bit smaller than practical spark length in air to ensure reliability. The relationship beteen pressure and distance is roughly linear. Increasing the pressure 10X will decrease the distance by roughly 10 fold. So, a BBQ piezo sparker that reliably sparks across a 1/8" gap in a 1X gun will only spark across an ~0.01" gap in a 10X hybrid.

	Spark plugs can be used for spark gaps, and are especially useful in metal guns, where the chamber wall would short out the screws of an ordinary spark gap.		Spark plugs can be used for spark gaps, and are especially useful in metal guns, where the chamber wall would short out the screws of an ordinary spark gap.
	Two or more spark gaps can be connected in series to generate multiple sparks, as long as the width of the combined gaps is smaller than the maximum spark distance. Spark gaps can not be wired in parallel, since the spark will then only jump the smallest gap.
	[[Spark strip]]s are a popular method of achieving multiple spark gaps.		Two or more spark gaps can be connected in series to generate multiple sparks, as long as the width of the combined gaps is smaller than the maximum spark distance. Spark gaps can not be wired in parallel, since the spark will then only jump the smallest gap.
			[[image:Multigap2.gif\|border]]

			Alternatively, the electrode to electrode wiring can be placed inside the chamber, for example:
			[[image:Multiple_gaps.gif\|border]]

			(For details see http://burntlatke.quibble.com/short.html)

			[[Spark strip]]s are another popular method of achieving multiple spark gaps.

	[[category:Concepts]]		[[category:Concepts]]
	[[category:Components]]		[[category:Components]]
	~~[[category:Ugly]]~~

Boilingleadbath: categorized

2007-04-15T12:24:28Z

categorized

← Older revision		Revision as of 07:24, 15 April 2007
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	Two or more spark gaps can be connected in series to generate multiple sparks, as long as the width of the combined gaps is smaller than the maximum spark distance. Spark gaps can not be wired in parallel, since the spark will then only jump the smallest gap.		Two or more spark gaps can be connected in series to generate multiple sparks, as long as the width of the combined gaps is smaller than the maximum spark distance. Spark gaps can not be wired in parallel, since the spark will then only jump the smallest gap.
	[[Spark strip]]s are a popular method of achieving multiple spark gaps.		[[Spark strip]]s are a popular method of achieving multiple spark gaps.

			[[category:Concepts]]
			[[category:Components]]
			[[category:Ugly]]

1984 at 03:29, 9 November 2005

2005-11-09T03:29:56Z

← Older revision		Revision as of 22:29, 8 November 2005
Line 1:		Line 1:
	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 cannon\|combustion]] and [[hybrid cannon]]s. Spark gaps are normally made by screwing two bolts through the side wall of the chamber, at an angle that puts the tips of the screws close together. The screws should be mounted to keep the heads a good distance apart, to ensure that the spark will not jump between the heads outside the chamber. The distance must be small enough that the voltage from the ignition source can jump across it. The distance is about 1.1 mm/kV, this varies with the shape of the electrodes though, sharp points allow longer sparks than flat surfaces. It should be noted that the pressurized mixture of a hybrid will shorten the max spark length, so a hybrid spark gap should be a fair bit smaller than max spark length to ensure reliability.		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 cannon\|combustion]] and [[hybrid cannon]]s. Spark gaps are normally made by screwing two bolts through the side wall of the chamber, at an angle that puts the tips of the screws close together. The screws should be mounted to keep the heads a good distance apart, to ensure that the spark will not jump between the heads outside the chamber. The distance must be small enough that the voltage from the ignition source can jump across it. The distance is about 1.1 mm/kV, this varies with the shape of the electrodes though, sharp points allow longer sparks than flat surfaces. It should be noted that the pressurized mixture of a hybrid will shorten the max spark length, so a hybrid spark gap should be a fair bit smaller than max spark length to ensure reliability.
	Spark plugs can be used for spark gaps, and are especially useful in metal guns, where the chamber wall would short out the screws of an ordinary spark gap.		Spark plugs can be used for spark gaps, and are especially useful in metal guns, where the chamber wall would short out the screws of an ordinary spark gap.
	Two or more spark gaps can be connected in series to generate multiple sparks, as long as the width of the combined gaps is smaller than the maximum spark distance. Spark gaps can not be wired in parallel, since the spark will then only jump the smallest gap.		Two or more spark gaps can be connected in series to generate multiple sparks, as long as the width of the combined gaps is smaller than the maximum spark distance. Spark gaps can not be wired in parallel, since the spark will then only jump the smallest gap.
	[[Spark strip]]s are a popular method of achieving multiple spark gaps.		[[Spark strip]]s are a popular method of achieving multiple spark gaps.

Wesman987: typo

2005-10-18T22:15:30Z

typo

← Older revision		Revision as of 17:15, 18 October 2005
Line 1:		Line 1:
	A spark gap consists fo 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 cannon\|combustion]] and [[hybrid cannon]]s. Spark gaps are normally made by screwing two bolts through the side wall of the chamber, at an angle that puts the tips of the screws close together. The screws should be mounted to keep the heads a good distance apart, to ensure that the spark will not jump between the heads outside the chamber. The distance must be small enough that the voltage from the ignition source can jump across it. The distance is about 1.1 mm/kV, this varies with the shape of the electrodes though, sharp points allow longer sparks than flat surfaces. It should be noted that the pressurized mixture of a hybrid will shorten the max spark length, so a hybrid spark gap should be a fair bit smaller than max spark length to ensure reliability.		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 cannon\|combustion]] and [[hybrid cannon]]s. Spark gaps are normally made by screwing two bolts through the side wall of the chamber, at an angle that puts the tips of the screws close together. The screws should be mounted to keep the heads a good distance apart, to ensure that the spark will not jump between the heads outside the chamber. The distance must be small enough that the voltage from the ignition source can jump across it. The distance is about 1.1 mm/kV, this varies with the shape of the electrodes though, sharp points allow longer sparks than flat surfaces. It should be noted that the pressurized mixture of a hybrid will shorten the max spark length, so a hybrid spark gap should be a fair bit smaller than max spark length to ensure reliability.
	Spark plugs can be used for spark gaps, and are especially useful in metal guns, where the chamber wall would short out the screws of an ordinary spark gap.		Spark plugs can be used for spark gaps, and are especially useful in metal guns, where the chamber wall would short out the screws of an ordinary spark gap.
	Two or more spark gaps can be connected in series to generate multiple sparks, as long as the width of the combined gaps is smaller than the maximum spark distance. Spark gaps can not be wired in parallel, since the spark will then only jump the smallest gap.		Two or more spark gaps can be connected in series to generate multiple sparks, as long as the width of the combined gaps is smaller than the maximum spark distance. Spark gaps can not be wired in parallel, since the spark will then only jump the smallest gap.
	[[Spark strip]]s are a popular method of achieving multiple spark gaps.		[[Spark strip]]s are a popular method of achieving multiple spark gaps.

GalFisk at 13:34, 18 October 2005

2005-10-18T13:34:48Z

New page

A spark gap consists fo 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 cannon|combustion]] and [[hybrid cannon]]s. Spark gaps are normally made by screwing two bolts through the side wall of the chamber, at an angle that puts the tips of the screws close together. The screws should be mounted to keep the heads a good distance apart, to ensure that the spark will not jump between the heads outside the chamber. The distance must be small enough that the voltage from the ignition source can jump across it. The distance is about 1.1 mm/kV, this varies with the shape of the electrodes though, sharp points allow longer sparks than flat surfaces. It should be noted that the pressurized mixture of a hybrid will shorten the max spark length, so a hybrid spark gap should be a fair bit smaller than max spark length to ensure reliability.
Spark plugs can be used for spark gaps, and are especially useful in metal guns, where the chamber wall would short out the screws of an ordinary spark gap.
Two or more spark gaps can be connected in series to generate multiple sparks, as long as the width of the combined gaps is smaller than the maximum spark distance. Spark gaps can not be wired in parallel, since the spark will then only jump the smallest gap.
[[Spark strip]]s are a popular method of achieving multiple spark gaps.