05/01/2005. Remarks by Nico Braas: "The second prototype of the Viscount Rolls-Royce Dart turboprop airliner, type 630 (G-AHRG), was rebuilt as type 663 with two 6,250 lb (2,835 kg) Rolls-Royce Tay R.Ta.1 turbojets, making its first flight on March 15, 1950. It entered RAF service as a test aircarft for the development of various control systems for the V-bomber program. This picture shows the Tay Viscount approaching to land."