The CF-105 originated from a 1952 requirement from the Royal Canadian Air Force, which led to an order for 37 development and pre series aircraft. The first five, known as Arrow Mk 1s, were powered by a pair of Pratt & Whitney J75-P-3 or -5 turbojets, each rated at 12,500lb st dry and 18,500lb st with afterburner. The remaining aircraft, as Arrow Mk 2s, would have been fitted with Orenda PS-13 Iroquois turbojets rated at 19,250lb st dry and 26,000lb st with afterburning. The aircraft would have carried an internal load of six Falcon or eight Sparrow AAMs.