Mechanical Fuzing System for Aircraft Bombs

M904 is a mechanical action nose fuze designed for use with all types of General Purpose (GP) low and high drag bombs Mk80. The fuze is armed by air pressure causing the arming vanes to rotate. Minimum airspeed of approximately 150 knots is required for arming. Arming delay time is marked in 2 s intervals from 6 to 18 sec. On impact a firing delay time is provided by delay element M9. An adaptor is required to accommodate the 2 inch fuze thread in the larger fuze wells of the Mk80. This fuze may be used for impact and impact-delay application in conjunction with tail fuze M905


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