The "Armidale"-class patrol boats are long, with a beam of , a draught of , and a standard displacement of 270 tons. The semi-displacement vee hull is fabricated from aluminium alloy, and each vessel is built to a combination of Det Norske Veritas standards for high-speed light craft and RAN requirements. The "Armidale"s can travel at a maximum speed of , and are driven by two propeller shafts, each connected to an MTU 16V M70 diesel. The ships have a range of at , allowing them to patrol the waters around the distant territories of Australia, and are designed for standard patrols of 21 days, with a maximum endurance of 42 days.