Ordnance – Barrels
Patent
1998-08-20
2000-07-18
Johnson, Stephen M.
Ordnance
Barrels
89 143, 89 8, F41A 2116
Patent
active
060891394
ABSTRACT:
A porous barrel, projectile passageway, or tube as a type of supersonic nozzle for projectile propulsion therein and method for optimizing projectile velocity therethrough. The porous barrel features a barrel wall containing holes, passageways, or otherwise porous material through the barrel wall that allows gas, fluid, or other matter to exit or move in a direction away from the barrel interior. The flow of gas, fluid, or other matter away from the barrel interior allows gas within the barrel to expand in a direction transverse to the projectile path. The amount of transverse expansion of the gas in the barrel interior can be controlled by the porosity of the barrel wall to cause any desired amount of gas expansion. Transverse expansion allows axial gas velocities within the barrel to exceed the local speed of sound as if the gas had passed through a converging diverging nozzle. In one embodiment, a pressurized gas source supplies a pressure propelling the projectile, and gas outflow from passageways through the barrel wall allows gas within the barrel to obtain supersonic velocities as the projectile accelerates.
REFERENCES:
patent: 3186304 (1965-06-01), Biehl
patent: 3204527 (1965-09-01), Godfrey et al.
patent: 3311020 (1967-03-01), Piacesi et al.
patent: 3465638 (1969-09-01), Canning
patent: 3468216 (1969-09-01), Charpentier
patent: 3771414 (1973-11-01), Graham
patent: 4457206 (1984-07-01), Toulios et al.
patent: 4590842 (1986-05-01), Goldstein et al.
patent: 4643073 (1987-02-01), Johnson
patent: 4658699 (1987-04-01), Dahm
patent: 5097743 (1992-03-01), Hertzberg et al.
patent: 5131313 (1992-07-01), Zimmerman
patent: 5303633 (1994-04-01), Guthrie et al.
patent: 5305677 (1994-04-01), Kleinguenther et al.
patent: 5421237 (1995-06-01), Naumann
Beeman Precision Airgun Guide, 1995, Edition 19, Beeman Precision Airguns, 5454 Argosy Drive, Huntington Beach, CA 92649 USA p. 21.
John, James E. A., 1984, Gas Dynamics, Allyn and Bacon, Inc., Newton, Massachusetts pp. 43-47, 74.
Jones, M. C., 1986, "Shock Simulation and Testing in Weapons Development," The Journal of Environmental Sciences, Sep./Oct., vol. 29, p. 17-21.
Casperson John R
Johnson Stephen M.
LandOfFree
Porous nozzle projectile barrel does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Porous nozzle projectile barrel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Porous nozzle projectile barrel will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2025478