T82 (V.T.) (Cancelled)

Bombs

Functioning

Armed time

Fuzes used with

Over-all length, inches

Body diameter, inches

Material

Steel body, plastic top, two aluminum bars athwartship

General: This is a V.T. fuze of the bar type. This fuze, like the V.T. Fuze M166, is more sensitive to head-on approach to a target than the ring type and less sensitive to "passing" objects. It can be used interchangeably in any bomb which takes the Nose Me-chanical Impact Fuze AN-M103A1 when air burst is desired. At the present stage of de-velopment, approximately 90 per cent of the fuzes will function properly upon approach to the target, and the remainder either will function spontaneously after arming but be-fore approaching a target, or will be inoperative.

Operation: When the bomb is dropped, the arming wire is pulled, releasing the spring-loaded turbine locking pin, which jumps out, freeing the turbine for rotation. The air stream enters the cavity in the fuze head, blows over the air turbine, and leaves through the lower ports, around the turbine. The air turbine drives the electric generator moun-ted in the fuze stem and the gear reduction system. After a minimum number of turbine revolutions, the detonator lines up with the booster lead-in and, at the same time, be-comes electrically connected to the firing circuit. The rotor detent in the detonator rotor snaps out into a hole in the rotor housing, locking the detonator in the armed position and at the same time withdrawing from the keyway in the arming stem. The turbine con-tinues to rotate at high speed, driving the generator, which has in the meantime activa-ted the V.T. element and charged the firing condenser. The fuze is now armed. Upon approach to a target under the proper conditions, the V.T. element activates the firing circuit, which discharges the firing condenser through the electric detonator, initiating the explosive train.

Remarks: The fuze differs from previous generator-energized bomb nose fuzes in that the entire generator and arming system is mounted inside the fuze stem, which fits inside the fuze well. The firing condenser is carried in that part of the body section which is outside the bomb and will usually be demolished.

The minimum S.A.T. may be extended by use of the Air-Travel Arming Delay M1, which clamps onto a bracket around the body of the fuze and prevents the spring-loaded turbine-locking pin from jumping out and freeing the turbine until the pre-set air travel of the M1 device has been completed.

The booster safety pin in this fuze locks the detonator rotor in the unarmed position. Before installation of the fuze in a bomb, the pin should be pulled and reinserted. If it cannot be reinserted, the fuze is armed or partially armed and should be destroyed.

Figure 356. V.T. Fuze T82