HMS Hever Castle (K521) depth on the fuses of the projectiles until the moment of firing. A single Squid-launched attack had a success rate of 25%. The class was also provided with HF/DF and Type 277 radar. "Hever Castle" was ordered on 23 January 1943. The ship, named for Hever Castle in Hever, Kent, was laid down on 29 June 1943 and launched on 24 February 1944. At some point in 1943, the ship was transferred to the Royal Canadian Navy. The corvette, renamed "Copper Cliff" after a suburb of Sudbury, Ontario, was commissioned into the Royal Canadian Navy on 25 February 1944 with
John Jacob Astor, 1st Baron Astor of Hever John Jacob Astor, 1st Baron Astor of Hever Lieutenant-Colonel John Jacob Astor V, 1st Baron Astor of Hever, DL (20 May 1886 – 19 July 1971) was an American-born English newspaper proprietor, politician, sportsman, military officer, and a member of the Astor family. Astor was born in Manhattan, New York City, in 1886, the fourth child of William Waldorf Astor, 1st Viscount Astor (1848–1919), and Mary Dahlgren Paul (1858–1894). He was five years old when his family left New York to live in England. He was raised on an estate purchased by his father at Cliveden-on-Thames in Buckinghamshire and was