| abstract |
Propellant charge or grain, comprising two or more energetic materials with different linear combustion velocity, where the two or more energetic materials are distributed within the charge or grain by additive manufacturing such that two perpendicular cross-sections of said propellant charge or each grain has at least two linear burn rate gradients in non-parallel directions, wherein said filler or propellant grain is additively-manufactured laminated with two or more different identifiable print layers having a layer thickness in the range of 1-2000 µm, wherein, if the propellant grain or charge has a longitudinal axis, at least one of said perpendicular cross-sections is along said longitudinal axis, and wherein said propellant grain or charge further comprises one or more drilling. |