Tender: Development and Ground Testing of 4 Prototype Single‑Use Engines (CALLISTO Light 750N & Heavy 1.8–2.0kN) – UK MOD Project CALLISTO v2

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The UK MOD is seeking industry partners to design, develop and conduct ground testing of four prototype affordable, scalable single‑use engines for current and future air systems, munitions and One Way systems under Project CALLISTO v2. UK‑based industry partners are invited to an Industry Day on Friday 12 June 2026, 13:00–16:30 at Tidworth Garrison Theatre to provide feedback on scope, timescales, feasibility and requirements; Project CALLISTO is no longer linked to Project BRAKESTOP. This phase covers design, development and ground testing in appropriate engine test facilities of four prototype engines, with future scaled production requirements to be captured under a separate procurement. The work is split into two separately competed lots: LOT 1 CALLISTO LIGHT (smaller engine, 750 N) and LOT 2 CALLISTO HEAVY (more powerful engine, 1.8–2 kN); industry partners may bid for either or both lots. For full details and registration for the Industry Day, see the attached document.