In 1959 "Eagle" entered Devonport Dockyard to begin this extensive refit, and by May 1964 it was complete. Standard displacement had increased to around 44,100 tons (full load displacement was 54,100 tons) and "Eagle" was now the largest aircraft carrier in the Royal Navy. Total cost of the refit was £31 million. The refit was intended to extend her operational life for another 10 years, and she now operated Blackburn Buccaneer, de Havilland Sea Vixen, Supermarine Scimitar and Fairey Gannet aircraft, but water-cooled jet blast deflectors (needed to operate the RN Phantom fighters) were not fitted, and therefore the full potential of the ship was not realized. In 1964-5 it was claimed "Eagle" and the proposed CVA01 and half sized "Hermes" would be a viable three carrier fleet until 1980. "Victorious" would have been replaced by CVA01 in 1973. In reality the 1958 Royal Navy assessment was that with affordable modernization of the existing carrier fleet, only HMS "Hermes" would be effective after 1975, and she was too small. These assessments by the Director of Naval Construction in November 1958 were very accurate, taking into account the slower than expected pace of reconstruction, corrosion of war-built hulls, the obsolete power trains except in "Victorious", and the cheap unsatisfactory mix of DC electrics with AC add-on generators where needed in "Eagle" and "Ark Royal".