"H" Class Submarine (1915)

H 28, probably shown upon her acceptance.^[1]

The Royal Navy's "H" Class Submarines were manufactured in Britain, America and Canada to a design similar to the American "H" class boats. They were considered coastal submarines.^[2]

[show]Overview of 44 vessels
Citations for this data available on individual ship pages
Name	Builder	Laid Down	Launched	Completed	Fate
H 1	Canadian Vickers		1915	May, 1915	Sold Mar, 1921
H 2	Canadian Vickers		1915	May, 1915	Sold 1921
H 3	Canadian Vickers		1915	Jun, 1915	Mined 15 Jul, 1916
H 4	Canadian Vickers		1915	Jun, 1915	Sold Nov, 1921
H 5	Canadian Vickers		1915	Jun, 1915	Collision 6 Mar, 1918
H 6	Canadian Vickers		1915	Jun, 1915	Interned 8 Jan, 1916
H 7	Canadian Vickers		1915	Jun, 1915	Sold Nov, 1921
H 8	Canadian Vickers		1915	Jun, 1915	Sold Nov, 1921
H 9	Canadian Vickers		1915	Jun, 1915	Sold Nov, 1921
H 10	Canadian Vickers		1915	Jun, 1915	Lost 19 Jan, 1918
H 11	Fore River Shipbuilding Company		1915	Apr, 1917	Sold 1921
H 12	Fore River Shipbuilding Company		1915	Apr, 1917	Sold 1922
H 13	Fore River Shipbuilding Company		1915	Apr, 1917	to Chile 3 Jul, 1917
H 14	Fore River Shipbuilding Company		1915	Apr, 1917	to Canada Jun, 1914
H 15	Fore River Shipbuilding Company		1915	Apr, 1917	to Canada Jun, 1919
H 16	Fore River Shipbuilding Company		1915	Apr, 1917	to Chile 3 Jul, 1917
H 17	Fore River Shipbuilding Company		1915	Apr, 1917	to Chile 3 Jul, 1917
H 18	Fore River Shipbuilding Company		1915	Apr, 1917	to Chile 3 Jul, 1917
H 19	Fore River Shipbuilding Company		1915	Apr, 1917	to Chile 3 Jul, 1917
H 20	Fore River Shipbuilding Company		1915	Apr, 1917	to Chile 3 Jul, 1917
H 21	Vickers		20 Oct, 1917	Jan, 1918	Sold Jul, 1926
H 22	Vickers		14 Nov, 1917		Sold Feb, 1929
H 23	Vickers		29 Jan, 1918	Apr, 1918	Sold May, 1934
H 24	Vickers		14 Nov, 1917	Apr, 1918	Sold May, 1934
H 25	Vickers		27 Apr, 1918		Sold 1929
H 26	Vickers		15 Nov, 1917	Mar, 1918	Sold Apr, 1928
H 27	Vickers		25 Sep, 1918		Sold Aug, 1935
H 28	Vickers		12 Mar, 1918	Jun, 1918	Sold Sep, 1944
H 29	Vickers		8 Jun, 1918		Sold Aug, 1935
H 30	Vickers		9 May, 1918		Sold Aug, 1935
H 31	Vickers		16 Nov, 1918		Sunk 24 Dec, 1941
H 32	Vickers		19 Nov, 1918		Sold Oct, 1944
H 33	Cammell Laird		24 Aug, 1918		Sold 1944
H 34	Cammell Laird		5 Nov, 1918		Sold 1945
H 41	Armstrong, Whitworth & Company		26 Jul, 1918		Cancelled 1918
H 42	Armstrong, Whitworth & Company		21 Oct, 1918		Collision 23 Feb, 1922
H 43	Armstrong, Whitworth & Company		3 Feb, 1919		Sold 1944
H 44	Armstrong, Whitworth & Company		17 Feb, 1919		Sold 1944
H 47	William Beardmore & Company		19 Nov, 1918		Collision 9 Jul, 1929
H 48	William Beardmore & Company		31 Mar, 1919		Sold Aug, 1935
H 49	William Beardmore & Company		15 Jul, 1919		Sunk 27 Oct, 1940
H 50	William Beardmore & Company		25 Oct, 1919		Sold 1945
H 51	Pembroke Royal Dockyard		15 Nov, 1918		Sold Jun, 1924
H 52	Pembroke Royal Dockyard		31 Mar, 1919		Sold Nov, 1927

Characteristics^[3]
	Groups 1 & 2	Group 3
Length (feet)	150	164
Breadth (feet)	15.25	ditto
Displacement (tons)	364/434	440/500
Draft	12-ft 4-in	ditto
Speed (knots)	13/11	ditto

Design and Construction

Rough design drawing of Group 3 Boats.^[4]

The forward diving planes could swivel forward and conform to the side of the boat for better surface seakeeping.

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.^[5]