Abstract: The present invention is a propulsion kit that is attached to a gliding air to surface bomb. The kit of the invention comprises one or more engines and, when activated, allows a significant extension of the length of the flight path of the bomb. The engines can be any type of air-breathing engine for example jet engines. The kit can be designed to be retrofitted to an existing gliding bomb. The kit of the invention allows the original bomb to function in one of the three following modes, depending on the bomb size and the aerodynamic characteristics: the original operation mode, an improved gliding ratio mode, and a cruise trajectory mode.