Patent ID: 8056462
Filing Date: 2011-11-15
Classification: F41B

Abstract:
1. A gas gun for firing a projectile, the gas gun comprising: a barrel having a bore; at least one gas injection port in communication with the bore, located proximate a breech end of the barrel and in communication with a pressure vessel through a first valve; at least another gas injection port in communication with the bore, located longitudinally between the at least one injection port and a muzzle end of the barrel and in communication with at least another pressure vessel through a second valve; a projectile velocity sensor located between the at least one gas injection port and the at least another gas injection port; and a control module in communication with the first valve, the projectile velocity sensor and the second valve, the control module comprising a processor configured for control of timing and duration of opening of the first valve and of the second valve and to determine a timing and duration of opening of the second valve responsive to a signal from the projectile velocity sensor.