HIR (Mk135) fuze
- Title
- HIR (Mk135) fuze
- Collection
- Caltech Images Collection
- Series
- Scientific Instrument Photographs
- Identifier
- ST-RK-16
- Extents
- 1 photographs (negative)
- Abstract
- Model 2, slightly modified over original and Model 1. 5.511″ long. Brass, steel, phosphor-bronze diaphragm. HIR (“hydrostatic-arming, impact-firing rocket”) fuzes were for shipboard rockets (7.2″ rocket, Mk1, 2, 4) and for aircraft rockets for retro-bombing (rockets fired rearward from low-flying aircraft) (7.2″ rocket, Mk3, 5). They originated at Caltech and were placed in limited production. 25,000 were produced then abandoned in favor of the smaller MK140. Cutaway model.