Castoldi waterjet drives are probably the most efficient ones, at high speed on the market; capable to outperform stern drives and to even match surface propeller drives.

With its center of trust positioned as low as possible (thanks to the integrated gear box which allows the lowering of the impeller shaft) the Castoldi waterjet drive gives superior directional stability at low speeds as well as high speeds.
Steady high performances in the long run thanks to the pure axial flow design of the Castoldi waterjet’s impeller and its low pressure high volume design.