Lancaster ND784 was used to test the Armstrong Siddeley AWX. A picture of this aircraft with the engine mounted in the bomb bay can found further down the page that JonathanF linked to.
The Air Britain Lancaster File gives a date of 28.9.45 for the first flight of ND784 with this combination. Later, the aircraft went on to test the Mamba.
Lancaster Engine testbed serials:
R5849: Merlin testbed
BT308: Metrovick F.2, FF 29.6.43
FM209: Avro Orenda, FF13.7.50
LL735: Metrovick F.2/4 Beryl plus 3,750 lb ST F.2/4 in bomb bay during 1949
ND784: Armstrong Siddeley ASX in bomb bay, FF 28.9.45, later fitted with Mamba in nose, FF 21.10.47
NG465: Rolls-Royce Dart, FF 10.10.47
PP779: Rolls-Royce Merlins
PP791: Rolls-Royce Merlins
RE137: AS Python mock-ups in outer nacelles
SW342: Mamba in nose, later fitted with Adder in tail, then Viper in tail
TW911: Pythons in outer nacelles, FF 3.1.49
8001 (ex RA801): 7,380 lb ST Dovern, later fitted with Ghost with afterburner
Best wishes
Steve P
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