Project CALLISTO (PROPULSION)

The UK MOD will be holding a Project CALLISTO Challenge Session on the afternoon of the 18th June 2025 in London, UK. Industry partners, particularly those currently established or planning to be established in the UK, are invited to attend to provide feedback on Project CALLISTO’s proposed scope, timescales and feasibility.

Additional information: The User requires a low-cost, 1.2-2kN propulsion system to power a UK MOD development programme (Proj BRAKESTOP) for a heavy One Way Effector (OWE). The propulsion system could be used for other applications e.g. cruise missiles, other OWEs.

Project BRAKESTOP has highlighted limited availability of the class of propulsion systems needed. Therefore, MOD wishes to increase the availability of this class of propulsion system. Technical Propulsion Engine Requirements The engine shall: • Be a 1.2 – 2kN single engine propulsion system (Sea Level Static Maximum Thrust) o Low end for least amount of ancillary cost (facilities, fuel, equipment, build material, machine size, test cell etc) o Could then be iterated for enhanced capability. • Be designed to be easily manufactured at scale using widely available manufacturing methods/machinery. • Manage at least 5 hours component life; this provides confidence in managing the expected application life, but also pushes the materials technologies to low cost.  • Be able to reliably start rapidly (ideally < 30 seconds) and accelerate to high power (ideally