Bomb for deployment from an air vehicle

A bomb for deployment from an air vehicle, the bomb comprising:

• a rocket motor for propelling the bomb,
• wherein the rocket motor comprises propellant, the propellant having an initial burning surface of a first surface area, and wherein the propellant at least partially defines a void downstream of the initial burning surface, the rocket motor being arranged such that as the propellant is burned the void will be exposed, thereby increasing the first surface area of the burning surface of the propellant to provide an increased thrust of the rocket motor, and
• wherein the propellant is structured as a rod or cylinder with first and second end faces, the first end face providing the initial burning surface, and one or more cavities extending from the second end face into the propellant and partway along it in an axial direction to provide the void, the propellant thereby having:
• a first section including the initial burning surface for providing a first level of thrust when the bomb turns into a dive orientation;
• and
• a second section containing the void for providing a second level of thrust, including the increased thrust, throughout a remainder of bomb flight or until the propellant is used up.