RFA One is an orbital vehicle that will have three stages and be launched from its Saxavord launchpad in the UK. Measuring 30 m tall and 2 m in diameter, RFA One targets a deployment capability of up to 1300 kg to a 500 km polar orbit.

The RFA One launch vehicle is being developed in Augsburg, Germany, with hot-fire tests of the engine and second stage already performed at the Esrange Space Center in Sweden, under the initial Boost! co-funding committed by ESA in 2022.