| (19) |
 |
|
(11) |
EP 0 484 985 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
26.08.1992 Bulletin 1992/35 |
| (43) |
Date of publication A2: |
|
13.05.1992 Bulletin 1992/20 |
| (22) |
Date of filing: 11.11.1991 |
|
| (51) |
International Patent Classification (IPC)5: F42B 10/06 |
|
| (84) |
Designated Contracting States: |
|
BE CH DE FR GB IT LI SE |
| (30) |
Priority: |
09.11.1990 US 611120
|
| (71) |
Applicant: ALLIANT TECHSYSTEMS INC. |
|
Edina,
Minnesota 55436 (US) |
|
| (72) |
Inventors: |
|
- Boire, William A. J.
Victoria,
Minnesota 55386 (US)
- Walker, Joseph F.
Maple Crove, MN 55369 (US)
|
| (74) |
Representative: Dost, Wolfgang, Dr. rer.nat., Dipl.-Chem. et al |
|
Bardehle, Pagenberg & Partner,
Galileiplatz 1
81679 München
81679 München (DE) |
|
| |
|
| (54) |
Ablative, warp resistant ammunition fins |
(57) An improved self-ablative fin assembly for a cannon-fired high velocity munition
projectile having an aerodynamic nose, a selectively elongated intermediate body rearward
of the nose and a plurality of stabilizing fins attached to the rear portion of the
body which prevents thermal degradation and abrasion of the fins during shell firing
and projectile flight. The fin assembly consists substantially of a heat resistant,
low friction, self-ablative polyetheretherketone polymer material which forms a protective
ablative char when overheated in air.