History
The principles were developed in a joint effort between the Swedish 'Försvarets forskningsanstalt' (Defence Research Agency), FOA and the artillery bureau at Kungliga MaterielFörvaltningen, KFM (later known as Försvarets MaterielVerk, FMV) in the latter part of the 1960s in order to increase the range of the coastal artillery. By 1966, it had been concluded that a small, slow-burning charge at the base of the projectile would positively reduce the vacuum behind it and hence increase the range due to the lower drag. The first full scale tests took place in 1969 with modified 10.5 cm steel shells with excellent results, and the Swedish patent was made in 1971.
The concept was quickly implemented into the 7,5 cm sjömålsgranat m/66 (anti-shipping shell m/66) used in the coastal fortification system 7,5/m57, and then rapidly into all anti-ship shells in the Swedish military.
Since the gas-generator for the 12 cm sjömålsgranat m/70 was to be manufactured by a company in the USA, the classification "secret" was removed from the patent. Shortly thereafter, the international rights were sold out ending up with the Space Research Corporation (SRC), owned by Gerald Bull.
Read more about this topic: Base Bleed
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