of the internal-burning type having a star or like shaped internal cavity

Full Title

Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof > using solid propellants (F02K9/72 takes precedence; using semi-solid or pulverulent propellants F02K9/70) > Shape or structure of solid propellant charges > of the internal-burning type having a star or like shaped internal cavity