The Perkasa were designed and built for the British Admiralty in 1954-59
they had three Rolls Royce Marine Proteus gas turbines as their main power plant,
driving through reverse/reduction vee-drive gearboxes to fully-cavitating propellers.
They were the first warships in the world to be fitted with these engines,
they have maximum speed between 50 and 60 knots. Most have diesel auxiliary engines for
cruising and manoeuvring. They are hard-chine, planing boats, 96 ft. in length. The
armament generally consists of two 40 mm L.60 Bofors guns and four 21-in
torpedoes carried in side-launching chutes.