From Halopedia, the Halo wiki
The Covenant frigate is a medium-tonnage warship type in the Covenant Navy. After the war's end, numerous frigates fell into the hands of various Covenant remnant factions, such as the Servants of Abiding Truth.
The only known frigate class is the CAR-class frigate. The given "R", or Reverence in the frigate's three-letter classification code, "CAR", denotes that the frigate is capable of conducting reconnaissance missions and is capable of excavating Forerunner artifacts.
There is an unidentified model of frigate that are equipped with multiple pulse laser turrets, four point-defense guns and one-three plasma turrets on a lateral surface. They have participated in most Covenant-UNSC ship-to-ship engagements. Although smaller than most other Covenant capital ships, they are still larger than a UNSC frigate or UNSC destroyer at around a thousand of meters. Like most other Covenant warships, frigates have a curving, bulbous shape and are equipped with energy shields. Furthermore, the Sangheili equipped their warships with anti-plasma torpedo "counter guiding signal" systems. The Jiralhanae stole this technology during the Great Schism and equipped some of their frigates, such as the Revenant, Twilight Compunction and Tenebrous, with such devices. However, they did not understand the full intricacies of the system, thus limiting their effectiveness.
There is also a different unidentified model of frigate. Measuring 550 meters (1,800 ft) in length and 110 meters (361 ft) in width, it has a teardrop-shaped profile, with a long, tapering tail that curl up into an open hook. It has at least one hangar bay, which is mounted on the frigate's belly, which was built in an oblong shape that was twenty metres wide and thirty metres deep. It could accommodate at least five Type-27 Banshees. One, the Radiant Arrow assigned to the Fleet of Inexorable Obedience, was in orbit over Netherop.
There is another unidentified model of frigate that is shaped like a "long-necked disk", with a dovetail stern. It carried multiple weapon systems including secondary pulse laser turrets and a primary unknown weapon system. The frigate also carried a self-destruct system. One such vessel, Steadfast Strike, was part of the Flotilla of Unsung Piety.
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