Ness Class Fleet Replenishment Ships (AFS). Built Swan Hunter , 1966/7. 12359 GRT. In RFA Service until 1981/3 when sold to USMSC.
RFA Lyness A339 (USNS Sirius 1981) RFA Stromness A344. (USNS Saturn 1983) RFA Tarbatness A345. (USNS Spica 1982).
Length: 523ft. Beam: 72ft. Draught: 25ft 6in. Depth: 44ft 6in.
Machinery: 8-cylinder Wallsend/Sulzer RD76 supercharged diesel engine, 12,800bhp, single shaft. Speed: 17-18 knots.
Aviation: Fitted with flight deck for helicopter but no hangar facilities. Complement: 110 RFA, 50 STON.