T77 (Nose Clockwork Aerial Burst)

General: The T77 is an M111A2 fuze body with anemometer vanes, instead of the propler vanes. This development was produced to ensure proper functioning of this type of fuze when used in the Fragmentation Bomb Cluster M26, or earlier model of the clus-ter.

The cluster may tumble in flight, preventing ordinary vanes from rotating sufficiently in the proper direction to arm the M111A2; hence the anemometer vanes were substituted.

Description: Modifiaction kits are issued to provide parts for converting the M111A2 into the T77 when the fuze is to be used in the fragmentation cluster. The kit contains the anemometer vane, vane nut, safety block, and fuze fixture. This fuze fixture serves as a support for the fuze during the process of modification.

Remarks: No such modification is necessary on the M155, because it arms in six to none turns of the vanes.

Figure 340. Aerial Burst Fuze T77