Description
This fuze is an arming vane type with mechanical delay. It arms in 800 to 1,100 feet of air travel and functions on impact with water or any denser medium with a delay of 0.01 second.
This fuze differs from the AN-Mk 219 in the following main features :
A delay of 0.01 second is incorporated in the explosive train of the fuze.
The fuze body itself is threaded to be screwed into the fuze cavity of the depth bomb, consequently no adapter is used.
When this fuze is used, only one 180 gram TNT booster pellet is used in the fuze cavity, another must be removed before assembling of the fuze to the bomb.
This fuze is standard for Navy demolition bombs and is a special purpose fuze for the depth bomb where blast effect is desired. For all normal usage, a hydrostatic fuze will function the depth bomb. Due to the fact that depth bombs are light case construction, the use of this fuze with its incorporated delay of 0.01 second is not recommended as the case may break before the fuze will function.
Models AN-Mk 221 not antisubmarine. This includes AN-Mk 221 and AN-Mk 221M1 except lots 21, 22, 23 and AN-Mk 221M3 and M4. These models are all the same being only slightly changed from the AN-Mk 221 Fuze and are manufactured by different concerns. The AN-Mk 221 will arm in approximately 850 feet air travel. All these fuzes will function, if dropped from 2,000 feet or higher, on impact with water.
Models AN-Mk 221 antisubmarine. This includes AN-Mk 221M1 lots 21, 22 and 23 and AN-Mk 221M2. These fuzes were modified to be inoperative on water impact when released from less than 7,000 feet altitude. The AN-Mk 22M1 are marked “A.S.” fuzes if they are of the antisubmarine lots. All of the AN-Mk 221M2 are built the same way, and therefore there is no need to mark these “A.S.”
Functioning
No information about functioning.
See Also
Source(s)
TM 9-1904, Ammunition Inspection Guide (1944)
