"R" Class Submarine (1918)

R 7, probably upon her acceptance for service.^[1]

A total of ten "R" Class Submarines were completed for the Royal Navy, especially designed to hunt other submarines.

Two units, R 5 and R 6, were cancelled.

Overview of 10 vessels
Citations for this data available on individual ship pages
Name	Builder	Laid Down	Launched	Completed	Fate
R 1	Chatham Royal Dockyard		25 Apr, 1918		Sold Jan, 1923
R 2	Chatham Royal Dockyard		25 Apr, 1918		Sold Feb, 1923
R 3	Chatham Royal Dockyard		8 Jun, 1918		Sold Feb, 1923
R 4	Chatham Royal Dockyard		8 Jun, 1918		Sold May, 1934
R 7	Vickers		14 May, 1918	Jun, 1918	Sold Feb, 1923
R 8	Vickers		28 Jun, 1918	Jul, 1918	Sold Feb, 1923
R 9	Armstrong, Whitworth & Company		12 Aug, 1918		Sold Feb, 1923
R 10	Armstrong, Whitworth & Company		5 Oct, 1918		Sold Feb, 1929
R 11	Cammell Laird		16 Mar, 1918	Jul, 1918	Sold Feb, 1923
R 12	Cammell Laird		9 Apr, 1918		Sold Feb, 1923

Radio

By war's end, all boats of "E" class and later were given 3 kilowatt Poulsen wireless sets, affording ranges of 200 miles submarine-to-submarine, and 300-400 miles between shore stations and submarines. Reception of shore stations of 400 miles was common, and high power shore stations could be received over 500-600 miles.^[2]