Difference between revisions of "Chamber to barrel ratio"
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| − | The chamber to barrel ratio, or C:B ratio, is the volume ratio between the chamber and barrel. The ratio determines how much of the available energy is transferred to the projectile, and a good C:B ratio is a major factor in [[combustion cannon]] performance. [http://www.burntlatke.com/launch.html Experiments] have shown that a C:B ratio of about 0.7:1 is the most efficient for a given chamber. This does not neccessarily mean that this is the best ratio to use in a gun, many guns would become overly long if they were to use a large enough barrel. Making the chamber smaller to match a certain ratio will not increase performance, since the total energy available will be decreased. Higher ratio cannons are louder, since more energy is wasted as noise when the projectile exits the barrel. | + | The '''chamber to barrel ratio''', or '''C:B ratio''', is the volume ratio between the chamber and barrel. The ratio determines how much of the available energy is transferred to the projectile, and a good C:B ratio is a major factor in [[combustion cannon]] performance. [http://www.burntlatke.com/launch.html Experiments] have shown that a C:B ratio of about 0.7:1 is the most efficient for a given chamber. This does not neccessarily mean that this is the best ratio to use in a gun, many guns would become overly long if they were to use a large enough barrel. Making the chamber smaller to match a certain ratio will not increase performance, since the total energy available will be decreased. Higher ratio cannons are louder, since more energy is wasted as noise when the projectile exits the barrel. |
The C:B ratio of [[pneumatic cannon]]s is much less fixed, since factors like air pressure and valve performance play a greater part in determining overall performance. It is adviceable to use [[GGDT]] to determine the best design for pneumatic cannons. | The C:B ratio of [[pneumatic cannon]]s is much less fixed, since factors like air pressure and valve performance play a greater part in determining overall performance. It is adviceable to use [[GGDT]] to determine the best design for pneumatic cannons. | ||
Revision as of 11:33, 25 October 2005
The chamber to barrel ratio, or C:B ratio, is the volume ratio between the chamber and barrel. The ratio determines how much of the available energy is transferred to the projectile, and a good C:B ratio is a major factor in combustion cannon performance. Experiments have shown that a C:B ratio of about 0.7:1 is the most efficient for a given chamber. This does not neccessarily mean that this is the best ratio to use in a gun, many guns would become overly long if they were to use a large enough barrel. Making the chamber smaller to match a certain ratio will not increase performance, since the total energy available will be decreased. Higher ratio cannons are louder, since more energy is wasted as noise when the projectile exits the barrel. The C:B ratio of pneumatic cannons is much less fixed, since factors like air pressure and valve performance play a greater part in determining overall performance. It is adviceable to use GGDT to determine the best design for pneumatic cannons.
