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Dual purpose gun barrel for spin stabilized or fin stabilized projectiles and gun launched rockets

  • US 4,712,465 A
  • Filed: 08/28/1986
  • Issued: 12/15/1987
  • Est. Priority Date: 08/28/1986
  • Status: Expired due to Fees
First Claim
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1. A gun barrel and projectile round combination, comprising:

  • an elongated tube having a smooth central bore and defining a muzzle end and a breech end;

    a hollow cylindrical insert retained within said breech end coaxial with said smooth central bore and having a plurality of helical grooves defining lands therebetween on the inner surface of said insert;

    a projectile loaded in said breech end, extending from the breech facing end of said insert forward into said smooth central bore, said projectile having a thin sidewall surrounding a central cavity and being dimensioned in diameter to provide a close sliding fit within said smooth central bore, said projectile further defining a hollow base circumscribed by a skirt which includes a plurality of pressure equalizing ports for transmitting breech pressure from the base of said projectile to the region between said thin sidewall and said smooth central bore; and

    a frangible film surrounding said projectile skirt closing said pressure equalizing ports.

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