(19)
(11) EP 0 071 322 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.07.1983 Bulletin 1983/29

(43) Date of publication A2:
09.02.1983 Bulletin 1983/06

(21) Application number: 82301433

(22) Date of filing: 19.03.1982
(84) Designated Contracting States:
CH DE FR GB IT LI SE

(30) Priority: 13.04.1981 GB 8111671

(71) Applicant: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and
 ()

(72) Inventor:
  • Richards, Peter John
     ()

   


(54) Training ammunition projectile


(57) An axisymmetrical projectile having a specified design launch condition includes an axisymmetrical cavity 12 substantially filled with liquid, the cavity dimensions and liquid characteristics being so tuned that a main natural frequency of the liquid within the cavity approaches a nutation frequency of the projectile to cause resonance after a predetermined duration of flight following a design launch. The resonance increases the nutation amplitude causing a rapid rise in drag which quickly halts the projectile's flight.






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