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20 x 102 Vulcan M-DN71
HEI-MP (Multi Purpose - Spreng-Brand)
Markings:
Fuze:
No markings
Projectile:
Engraved:
nothing
Painted:
20K (20 Kanone = 20mm)
HEI
M – DN 71 (Designation of the Projectile)
Drive-band:
blank
Case:
20x102 DM1003 (German designation for the M103 shell )
LOS NWM-1-96 (shell made by Nederlandsche Wapen-en Munitiefabriek NV., "DE KRUITHOORN,
's-Hertogenbosch, Netherlands)
Headstamp:
Blank
Extra Info:
The 20x102 M-DN 71 High Explosive Incendiary - Multi-Purpose round (HEI-MP) is a Base detonating
round.
The ballistic nose-cap is filled with thermite (red). The upper (dark-blue) loading above the bursting
charge(light-grey) is a mixture of Zirconia / Hafnia that enhances the pressure build-up by the
bursting charge.
The projectile has a base fuze DM-201 produced by Diehl, Germany.
Most interesting feature of this projectile, is the small delay provided by the base fuze.
The projectile penetrates a 5mm Dural plate (Aviation Aluminum) at 100m at a 82° angle, and
explodes only after passing it completely.
A similar round with a PD M505 fuze would explode on impact.
Functioning of the base fuze DM-201
The fuze has 2 safety mechanisms:
-
The rotating safety (ball misaligned with striker in safe position)
The ‘unwinding’ ribbon that blocks the firing pin when not unwind by the rotation of the
projectile.
© info and cutaway picture DJH