Three questions:
1) if Hawker 1081 is built, would HMG still buy DH Venom/Vampire Javelin and other such aircrafts?
Yes. The P.1081 was a small day fighter (dogfighter) in the mould of the F-86 Saber. The Venom was a stopgap ground attack aircraft - the P.1081 may have been able to do the job but a suitable variant would not have been in service until maybe 1954. However, the Javelin and Sea Vixen were much larger; twin engined all weather interceptors with massive guidance radars (for better AAMs) and a crew of two. The only aircraft that will really be likely be affected in RAF Service, other than Canadair F-86's is the OTL Hunter. At subsonic speeds it would have little to offer above the P.1081. If it is stil built it will most likely be in the mould of the P.1083 - a transonic fighter able to counter the MIG-19
2) was Hawker 1121 single or double engined?
Single engined. It was planned to either use a de Havilland Gyron (massive bulky beast) at high altitude. An RR Conway at low level or a an Olympus for best of both. However, Sidney Camm (its designer) was very interested in the Rolls Royce Medway then under development.
There were two engined developments of the P.1121, however. The P.1125 and P.1129 were both to utilize the same avionics as the P.1121 as well as some design features but for use in the low level attack role.
3) if UK buys Avro Arrow, would UK still buy EE Lightning?
It depends upon the POD. Britain already was, to an extent involved in the development of the Arrow - the RB.106 engines (superior even to Canadian Orenda Iroquois engine) was originally in development for British Mach 2+ interceptors but had been selected by Avro Canada to power their Arrow before being cancelled in 1957. If an earlier (early 50's) agreement to continue developing both the RB.106 and Arrow for Anglo-Canadian use then the inferior looking lightning could be cancelled and the Arrow put in it's place. However, the Arrow probably wouldn’t be in service until at least 1962, nor in suitable numbers until the mid 60's. So that would leave a massive interceptor gap until around 1963-1965. The Lightning was originally only ever meant to fill such a gap in British planning until the Operational Requirement F.155 fighters came into service (Arrow negates these). So it depends how willing the Air Ministry and government was willing to leave Britain poorly defended.
In my personal view the EE Lightning was superior to the Arrow anyhow - not in terms of technology and capability (the Arrow mops the floor here) but in terms of in service date, unit costs and maintaience costs. It may not have been as fancy but Cold War developments (i.e no Mach 3 Soviet Bombers going into service) meant that it stayed as an effective ergonomic interceptor until the late 70's, even into the 80's. If the Arrow had been built in its stead it would have been in considerably smaller numbers - more expensive and fewer to cover the air defense of the country.
Russell
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