Description
The 1.1 inch Mk 1 is not self-destroying; the 1.1 inch Mk SD 1 is self-destroying. This is the primary difference between the two projectiles.
The Mk SD 1 consists of a Mk 1 projectile body modified for self-destruction by drilling through the wall between the tracer and HE cavities.
The Mk 1 projectile may also be issued BL & T for target practice or de-icing.
The 28 Mods are to distinguish among contractors.
Functioning
No information about functioning.
See Also
Nothing else to see.
Source(s)
OP 1664, Volume 1 - US Explosive Ordnance (1947)
