Skirted projectiles for railguns

Ordnance – Accelerating

Patent

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102501, 124 3, F41B 600

Patent

active

052750833

ABSTRACT:
A single skirt projectile (20) having an insulating skirt (22) at its rear, or a dual trailing skirt projectile (30, 40, 50, 60) having an insulating skirt (32, 42, 52, 62) succeeded by an arc extinguishing skirt (34, 44, 54, 64), is accelerated by a railgun accelerator 10 having a pair of parallel conducting rails (1a, 1b) which are separated by insulating wall spacers (11). The insulating skirt (22, 32, 42, 52, 62) includes a plasma channel (38). The arc extinguishing skirt (34, 44, 54, 64) interrupts the conduction that occurs in the insulating skirt channel (38) by blocking the plasma arc (3) from conducting current from rail to rail (1a, 1b) at the rear of the projectile (30, 40, 50, 60). The arc extinguishing skirt may be comprised of two plates (36a, 36b) which form a horseshoe wherein the plates are parallel to the rails (1a, b); a chisel-shape design; cross-shaped, or it may be a cylindrical (64). The length of the insulating skirt channel is selected such that there is sufficient plasma in the channel to enable adequate current conduction between the rails (1a, 1b).

REFERENCES:
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patent: 2802399 (1957-08-01), Little
patent: 4343223 (1982-08-01), Hawke et al.
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patent: 4471699 (1984-09-01), Turco et al.
patent: 4485720 (1984-12-01), Kemeny
patent: 4625618 (1986-12-01), Howanick
Usuba et al, "Development of Railgun Accelerator Combined With Two-Stage Light Gas Gun," IEEE Transactions on Magnetics, vol. MAG-20, No. 2, Mar. 1984, pp. 260-263.
Hawke et al, "Plasma Armature Formation In High-Pressure, High-Velocity Hydrogen," IEEE Transactions on Magnetics, vol. 25, No. 1, Jan. 1989, pp. 219-222.
Webster's New World Dictionary, 1957, "parallel" pp. 1060-1061, "surface" p. 1467.
Thio, Y. C., "Feasibility Study of a Railgun as a Driver for Impact Fusion", DOE/ER/13048-3, Jun. 1986, pp. 6-1-6-33.
Usuba et al, "Development of Railgun Accelerator at NCLI," IEEE Transactions on Magnetics, vol. MAG-22, No. 6, Nov. 1986, pp. 1785-1789.
G. A. Clark, Department of Defence, Melbourne, Australia, Report MRL-R-1018 "Evaluation of Capel, A Novel Railgun Concept".

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