Wander00
The Merlins were shut down and feathered when running on the jets...
First to fly was Lancastrian VH742, delivered to the Rolls-Royce flight development airfield at Hucknall in October 1945. Its outer Merlin engines were removed and the nacelles were also taken away, while the fuel system was completely rebuilt to carry both gasoline for the inner engines and kerosine for the new jets. In the outer positions were added completely new nacelles housing Nene turbojets, then the most powerful jet engines in the world. It flew again on August 14, 1946 with two Merlins and two Nenes.
On September 19, 1946 this aircraft acted as the world's first jet airliner by making three passenger flights carrying representatives of the Press as well as Ministry officials and other passengers (who were all most impressed and suggested that an airline that could offer jet travel would be the talk of the world). Rolls-Royce also flew a second Nene-Lancastrian, VH737, and two Avon-Lancastrians, VM732 and VL970. The latter was used for almost six years, its later flying being concentrated on the Avon 502 civil turbojet for the Comet 2 airliner.