|
Particulars
of British Submarines 1939
NARWHAL CLASS
ENLARGE
1933
Estimates
|
Narwhal
Grampus |
Vickers
|
1936
|
| 1934
Estimates |
Rorqual |
Vickers |
1937 |
1935
Estimates
|
Cachalot |
Scotts |
1938 |
| 1936
Estimates |
Seal |
Chatham |
1939 |
By the time
the Narwhal class was authorised the troubles with leaking external
fuel tanks in the O, P and R-classes had come to light. Although
it was hoped to remedy matters by welding the external tanks,
it was considered that all future submarines should carry all
their fuel internally. The Narwhal-class were originally to be
repeats of Porpoise but were now re-designed
to be minelayers of the same type but with internal fuel. It was
found possible to do this without loss of endurance.
|
Dimensions
|
293'
x 25½’ x 18' = =1810 tons (surface)
2157
tons (submerged)
|
|
Armament
|
Six
21" bow torpedo tubes. Twelve 21" Mark VIII
torpedoes.
Fifty Mark XVI moored contact mines.
One 4" QF Mark III gun on an S1 mounting. 120 rounds
ammo.
Two Lewis guns and five rifles.
|
|
Propulsion
|
Twin
Diesel engines 3300 HP = 16 knots.
136 tons oil fuel = 3480 miles at full speed or 10,000
miles at economical speed.
Main motors 1630 HP = 8.7 knots submerged.
Batteries. 336 cells of 138 tons = 1.2 hrs at 8 knots
submerged.
|
|
Hull
|
Double
Hull type.
Diving depth 300 feet.
|
|
Complement
|
5
Officers and 54 men.
|
|
Detecting
devices
|
Two
40foot periscopes.
Type 118 asdic set but a type 129 in SEAL.
|
|