Abstract: In order to open the cover of a concentric canister launcher (CCL) automatically with the jet during its launching, four schemes are put forward, viz.fracturable cover, eccentrically positioned interior and exterior launching tubes, jet guides of assymmetric construction, and covers made of heterogeneous materials. Modes of flow under each scheme are numerically simulated. Detailed data show that all the four schemes are feasible, yet the last named scheme keeps the opened cover intact and makes it fly along the expected direction.