Description
The upper portion of the body houses the vane hub, which is secured by bearing pins, and is threaded into the lower body and held by a grub screw. The striker body, threaded Into the pressure plate, is prevented from rotating during the arming time by a shear wire and a locating stud. Two grub screws engage the keyway in the vane hub and allows the pressure plate to rotate with the vane hub.
Appears designed for use with a standard gaine in Japanese designated Nos. 3, 6, and 25 Land and Ordinary bombs. With a standard gaine or magazine it is also suitable for the same sizes of Mark bombs where nose impact fuzing is employed. Its use has been rare.
May arm in 5 revolutions of the arming vanes.
Fragments of this fuze were found in India and on Midway Island. It Is reported to be used in a 500 kg GPHE bombs. Probably obsolete.
Functioning
On release, the safety pins are removed, the vanes rotate and the pressure plate moves upward and away from the fuze (due to the left-hand threads). The vanes do not move vertically because the hub to which they are attached, turns also - being held by the bearing pins. The pressure plate is stopped by the grub screws when it reaches the limit of its keyway. Impact pushes the pressure plate inward. The striker body is forced downward, shear wire is broken, and the striker hits the primer.
Hazardous Components
Standard Navy gaine.
Physical Data
Length, overall - 6 in (152.4 mm)
Width, overall - 2.25 in (57.2 mm)
See Also
Nose, A-1(c), Type 2 Model 1 Mod 3
Source(s)
OP 1667, Japanese Explosive Ordnance, Volume 1 (1946)
USNBD - Japanese Bombs & Fuzes (1944)
TM-E9-1984, Enemy Bombs and Fuzes, Section VII, Japanese Fuzes (1942)
