yes, thats about right.
taken from http://www.csd.uwo.ca/~pettypi/elevon/baugher_other/wyvrn-01.html
The available engines for the Wyvern were the Rolls-Royce Clyde and the Armstrong Siddeley Python. The Clyde was a twin-spool engine, with one spool driving a centrifugal compressor and the other the propeller and an axial compressor. The Clyde delivered at least 4030 hp, with a potential for much more. The Clyde was used for prototype VP120. The radiator and underwing oil coolers were removed, a smaller tail was fitted, and a six-bladed contraprop installed. The engine had twin exhausts, one on each side of the fuselage, over the wing. It first flew on 18 January 1945, and showed to be excellent. Production had to be canceled however, simply because Rolls-Royce refused to build the Clyde engine in series! Rolls-Royce was committing itself fully to jet engines.
The Python was an older design and lower-powered (3760 hp), with a reverse-flow, 14-stage axial compressor. The first Python-engined Wyvern TF.2 was VP109 and flew on 22 March 1949, with an eight-bladed Rotol propeller, but otherwise similar to VP120. Oil coolers were placed in the extended wing roots. It was followed by a second prototype and a few T.3 two-seat trainers. Experiences with the engine were far from satisfactory, unreliability and a slow reaction speed making the aircraft unpopular. If it had been available, Westland would probably have liked to return to the Eagle engine; but that was not possible, and twenty Python-engined TF.2s were built. Carrier trials began on 21 June 1950
TNZ
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