The Leander-class, or Type 12I (Improved) frigates, [1][2][3] comprising twenty-six vessels, was among the most numerous and long-lived classes of frigate in the Royal Navy 's modern history. The class was built in three batches between 1959 and 1973. It had an unusually high public profile, due to the popular BBC television drama series Warship.

1 part in 10 to the ninth power. The Leander class frigates used FSA(1). 6. Control and Monitoring Desk. This was the focal point of the system. It provided for the remote control and tuning of the equipment in a central position and for monitoring any particular radio channel. Ideally this desk was manned 24 hours a day whilst at sea - didn't ...

H.M.S. Leander was the lead ship, of an outstanding post war frigate class. The design has been so successful, that a number of ships are still in service with other navies, 30 years after their commissioning.

The Leander-class frigates needed extensive refitting, especially after the frigate-replacement studies dragged along into the late 1980s. One tough decision was made early: HMNZS Waikato would miss out on the full upgrades; instead, she and HMNZS Southland are earmarked for early replacement when the ANZAC frigates are delivered.

This was due to F 421 being a more modern RNZN frigate, with then current Rn surveillance radar and ESM and a more effectively insulated frigate from nuclear fallout, with the Improved Broad Beam Leander steam plant, for example, being remote controlled and capable of unmanned operation and therefore the ship provided a more effective sealed ...

The design which evolved managed to incorporate the long-range air warning radar and the helicopter of the Tribal' class, but with the armament, fire control and rough-weather capability of the Whitby/Rothesay design.

The Leander-class, or Type 12I (Improved) frigates, comprising twenty-six vessels, was among the most numerous and long-lived classes of frigate in the Royal Navy's modern history. The class was built in three batches between 1959 and 1973.

Leander-class frigates were developed from the Rothesay and Whitby class frigates of which HMNZS Otago & Taranaki are the examples in RNZN service. In 1981 the RNZN announced it was purchasing two Leander-class frigates to replace HMNZS Otago and Taranaki.

This improved Type 12 will be known as the Leander class. The hull and steam turbine machinery will be substantially the same as for the Whitbys. The main new features planned are a long-range air warning radar, the Seacat anti-aircraft guided missile, improved anti-submarine detection equipment and a light-weight helicopter armed with homing ...

HMS Naiad was the first Leander-class frigate to be fitted with quadruple Seacat launchers instead of 40-mm guns. She was launched on the 4th November 1963 and commissioned on the 15th March 1965. In 1966, Naiad became the leader of the Northern Ireland Squadron, relieving HMS Penelope, and subsequently deployed to the Far East and South America.