"P" Class Patrol Boat (1915)

A total of 43 "P" Boats were completed for patrol work with the Royal Navy. Ten additional vessels (seemingly, Ps 42-44, 51, 55, 56, 60-63) were started but were completed as "PC" Boats.

All were launched between October 1915 and May 1918, but the launch dates we provide are approximate.

Overview of 44 vessels
Citations for this data available on individual ship pages
Name	Builder	Laid Down	Launched	Completed	Fate
P11	J. Samuel White		14 Oct, 1915		Sold Dec, 1921
P12	J. Samuel White		4 Dec, 1915		Collision 4 Nov, 1918
P13	William Hamilton & Company		7 Jun, 1916		Sold Jul, 1923
P14	Charles Connell & Company		4 Jul, 1916		Sold Jul, 1923
P15	Workman Clark & Company		24 Jan, 1916		Sold Nov, 1921
P16	Workman Clark & Company		23 Mar, 1916		Sold Nov, 1921
P17	Workman Clark & Company		21 Oct, 1915		Sold Nov, 1921
P18	A. & J. Inglis		20 Apr, 1916		Sold Nov, 1921
P19	Northumberland Shipbuilding Company		21 Feb, 1916		Sold Jul, 1923
P20	Northumberland Shipbuilding Company		3 Apr, 1916		Sold May, 1923
P21	Russell		31 Mar, 1916		Sold Nov, 1921
P22	Caird & Company		22 Feb, 1916		Sold Dec, 1921
P23	Bartram & Sons		5 Mar, 1916		Sold Jul, 1923
P24	Harland & Wolff, Govan		24 Nov, 1915		Sold Dec, 1921
P25	Harland & Wolff, Govan		15 Jan, 1916		Sold Dec, 1921
P26	Tyne Iron Shipbuilding Company		22 Dec, 1915		Mined 10 Apr, 1917
P27	Joseph T. Eltringham & Company		21 Dec, 1915		Sold Jul, 1923
P28	J. & G. Thomson		6 Mar, 1916		Sold Jul, 1923
P29	William Gray & Company		6 Dec, 1915		Sold Jul, 1923
P30	William Gray & Company		5 Feb, 1916		Sold Jul, 1923
P31	J. Readhead & Sons		5 Feb, 1916		Sold Dec, 1926
P32	W. Harkess & Sons		20 Jan, 1916		Sold Dec, 1921
P33	Napier & Miller		8 Jun, 1916		Sold Dec, 1921
P34	Barclay Curle & Company		22 Mar, 1916		Sold Dec, 1921
P35	Caird & Company		29 Jan, 1917		Sold Jan, 1923
P36	Caird & Company		25 Oct, 1916		Sold Jan, 1923
P37	William Gray & Company		28 Oct, 1916		Sold Feb, 1924
P38	Caird & Company		10 Feb, 1917		Sold May, 1938
P39	A. & J. Inglis		1 Mar, 1917		Sold Sep, 1922
P40	J. Samuel White		12 Jul, 1916		Broken up 1938
P41	Bartram & Sons		23 Mar, 1917		Sold Sep, 1922
P45	William Gray & Company		24 Jan, 1917		Sold Jan, 1923
P46	W. Harkess & Sons		7 Feb, 1917		Sold Oct, 1925
P47	J. Readhead & Sons		9 Jul, 1917		Sold Oct, 1925
P48	J. Readhead & Sons		5 Sep, 1917		Sold May, 1923
P49	J. & G. Thomson		19 Apr, 1917		Sold Jan, 1923
P50	Tyne Iron Shipbuilding Company		25 Nov, 1916		Sold Oct, 1921
P52	J. Samuel White		28 Sep, 1916		Sold May, 1923
P53	Barclay Curle & Company		8 Feb, 1917		Sold Feb, 1924
P54	Barclay Curle & Company		25 Apr, 1917		Sold Feb, 1924
P57	William Hamilton & Company		6 Aug, 1917		to Egypt 21 May, 1920
P58	William Hamilton & Company		9 May, 1918		Sold Dec, 1921
P59	J. Samuel White		2 Nov, 1917		Sold Jun, 1938
P64	A. & J. Inglis		30 Aug, 1917		Sold Apr, 1923

Design

"P" boats resembled submarines, with a low appearance and ram bow. Large rudders combined with a sprightly hull form ensured high manoeuvrability.

Armament

one 4-in gun forward (a second, aft, in P52).
one 2-pdr pom-pom
two single 14-in torpedo tubes (seemingly fitted to fire at fixed angles on the quarters, these were removed by 1918 to make room for more depth charges^[1])
two cradles aft for single depth charges

Many of the 14-in torpedo tubes removed from these boats was fitted in destroyers of the Harwich Force and Dover Patrol as fixed tubes firing on the beam.^[2]