O Class Fleet Replenishment Tankers.
Built 1965/6. 24134dwt. RFA Olwen (2) A122 (Ex Olynthus). RFA Olmeda A124 (Ex Oleander). RFA Olna(3)A123.
Length overall: 648ft. Beam: 84ft. Draught: 34ft. Depth: 44ft.
Machinery: Olwen, Olna 2 x Hawthorn Leslie/Pametrada double reduction geared turbines; Olmeda 2 x Wallsend/Pametrada double reduction geared turbines 26,500shp, 2 x Babcock and Wilcox superheat boilers, single shaft, bow thruster (Olna only - never worked). Speed: 21 knots.(On the measured mile just off the Isle of Arran!) Range: 10,000nm / 16 knots. Armament: 2 x 20mm; 2 chaff launchers. Aircraft: 3 x Westland Wessex or Westland Sea King. Complement: 88 RFA, 40 RN
Olmeda scrapped 1994. Others 2000.