Reathaí-class Torpedo Boats, also called 'The Fleet's Runners', were small, wooden-hulled torpedo boats with a steelen skeleton.

Bringing a bit less then a hundred tons of weight onto the table, these 33.5 metres long, 4.9 metres wide and 1.48 metres deep boats were armed with two torpedo tubes, later increased to four (Reathaí Mark II), and three Gabha G-36 20mm Guns (they could also carry 10 mines). A round-bottomed hull and two small rudders by the side of the main rudder provide the so-called Lürssen-Effekt, when employed, allowing the seaworthy hull to sustain speeds of 45 to 50 knots for short times, three Diesel Engines providing 3,000 kilowatts of Energy (cruising is done at 15 to 20 knots). The living conditions were cramped, staying at sea with such a boat for longer then a day was highly uncomfortable, but their operational worth was increased with radio, better torpedoes, improved tactics and simple luck.

Several Reathaí-class Torpedo Boats made it into civilian hands and became high-speed yachts, the most famous of which is Faye Donn of the Tribe of Wexford's Reathaí, with the Silverport Dockyards Limited Subsidiary Bád Industries Limited thinking about a new version of the torpedo boats as a private pleasure vessel.

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