 Backup designs were the Bristol Olympus OL-3, the US-built Curtiss-Wright J-67 version of the OL-3, or the Orenda TR.9 engines.Armament was stored in a large internal bay located in a "belly" position, taking up over one third of the aircraft fuselage.A wide variety of weapons could be deployed from this bay, such as the Hughes Falcon guided missile, the CARDE Velvet Glove air-to-air missile, or four general-purpose 1,000 lb bombs.