Editing Base bleed (section)

==History==
The principles were developed in Sweden in the mid-1960s by the [[Swedish National Defence Research Institute|Försvarets forskningsanstalt]] (abbreviated FOA) and the Artillery bureau at the Kungliga Materielförvaltningen (later the [[Defence Materiel Administration (Sweden)|Försvarets Materielverk (FMV)]]) while working on a [[Rocket Assisted Projectile|rocket-assisted projectile]] called "reatil". Their goal was to increase the range of coastal artillery.<ref name="Grenander">Grenander</ref> By 1966, it had been concluded that a small slow-burning charge at the base of the projectile would alleviate the low pressure behind the shell, hence increasing the range by lessening the difference between the pressure due to [[aerodynamic drag]] on the nose of the shell and the low pressure behind the base. The first full-scale tests took place in 1969 with modified 10.5&nbsp;cm steel shells, with excellent results, and the Swedish patent was granted to FOA in 1971 although both application and patent were classified. Since the development was done, the patent was transferred to FMV for procurement to the armed forces of Sweden.

The concept was quickly implemented into the ''7.5&nbsp;cm sjömålsgranat m/66'' (7.5&nbsp;cm anti-ship shell m/66) used in the [[7.5 cm tornpjäs m/57]] fixed coastal artillery gun, and then rapidly into all anti-ship shells in the Swedish military.

Since FMV was to contract a company in the US to manufacture the gas generator for the ''12&nbsp;cm sjömålsgranat m/70'' (12&nbsp;cm anti-ship shell m/70), used in the [[12 cm tornautomatpjäs m/70|12 cm TAP m/70]] fixed coastal artillery gun, the classification ''secret'' was removed from the patent. Shortly thereafter the international rights were sold, eventually ending up with the [[Space Research Corporation]] (SRC), then owned by aeronautical engineer [[Gerald Bull]].

By the end of the 20th century, the technology was generally available world-wide.