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J1 submarines (1916-1917/1919)


Photo



   J4 1919

Ships


Name No Yard No Builder Laid down Launched Comp Fate
J1     Portsmouth DYd, UK 4.1915 6.11.1915 4.1916 // 3.1919 sold 2.1924
J2     Portsmouth DYd, UK 5.1915 6.11.1915 7.1916 // 3.1919 sold 2.1924
J3 (ex-J7)     Pembroke DYd, UK 3.1915 4.12.1915 6.1916 // 3.1919 sold 1.1926
J4 (ex-J8)     Pembroke DYd, UK 3.1915 2.2.1916 8.1916 // 3.1919 sold 2.1924
J5     Devonport DYd, UK 4.1915 9.9.1915 5.1916 // 3.1919 sold 2.1924
J7     Devonport DYd, UK 8.1916 21.2.1917 11.1917 // 3.1919 sold 11.1929


Technical data


Displacement standard, t 
Displacement normal, t

J1 - 5: 1204 / 1820

J7: 1212 / 1820

Length, m

J1 - 5: 84.0

J7: 83.7

Breadth, m

7.02

Draught, m

4.27

No of shafts

3

Machinery

3 12-cyl Vickers diesels / 3 electric motors

Power, h. p.

3600 / 1350

Max speed, kts

19.5 / 9.5

Fuel, t

diesel oil 91

Endurance, nm(kts)5000(12.5)
Armament

J1: 1 x 1 - 102/40 BL Mk XI, 1 x 1 - 40/37 2pdr QF Mk III, 6 - 450 TT (4 bow, 2 beam, 12), 2 DCR

J2, 4: 1 x 1 - 102/40 QF Mk IV, 1 x 1 - 40/37 2pdr QF Mk III, 6 - 450 TT (4 bow, 2 beam, 12)

J3: 1 x 1 - 76/30 10cwt QF Mk II, 1 x 1 - 76/28 12pdr 8cwt QF Mk I, 6 - 450 TT (4 bow, 2 beam, 12)

J5, 7: 1 x 1 - 102/41 QF Mk VII, 1 x 1 - 40/37 2pdr QF Mk III, 6 - 450 TT (4 bow, 2 beam, 12)

Complement

44

Diving depth operational, m50


Standard scale images


<i>J2</i> 1916
J2 1916


Graphics


   <i>J4</i> 1919
   J4 1919


Project history

The continuing incorrect intelligence reports of 22kt U-boats so worried the C-in-C of the Grand Fleet that he lobbied successfully for yet another attempt at a fleet submarine, capable of keeping station with the battle fleet. Vickers, already wrestling with the engines for the Nautilus, did not propose to use the 1850hp diesel, and suggested instead that the standard 8-cyl engine could be enlarged to 12-cyl, but it would still take three, and although 20kts was the speed asked for, the records suggest that 19.5kts was the accepted design-speed. Given the haste with which the design was to be prepared the Admiralty had no choice, and approved its one and only triple-shaft design in January 1915. The design was another partial double-hull type, with the double hull occupying 56% of the length. As built the large free-flooding casing brought the bows down in a seaway, slowing the boat down, so it was sealed off. After some months in service all had their bows raised, and thereafter could make 17kts in the heaviest seas.

Originally eight boats were approved, all from the Royal Dockyards, but two from Portsmouth DYd, J3 and J4, were cancelled and J7 and J8 were renumbered to fill the gap. A further boat was ordered for the RAN but she differed in important respects. The control room was moved from just forward of the beam TT to the motor room aft. The conning tower was therefore moved aft as well, but in other respects J7 was identical to her sisters.

Modernizations

None.

Naval service

No significant events.