 The two-shaft layout was relatively advanced for the era; the single-shaft de Havilland Gyron matched it in power terms, while the two-spool Bristol Olympus was much less powerful at its then-current state of development.Apart from being expected to power British aircraft such as those competing for Operational Requirement F.155 it was selected to be the powerplant for the Avro Canada CF-105 Arrow.The American company Westinghouse was reported in 1956 to be serious about acquiring a licence to build the RB.106.