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FIGHTING SHIPS OF THE WORLD
POLAND
COASTAL FORCES
S1 CHART motor torpedo boats (gunboats) (1940 / 1940)


Ships


Names Builders Completed Losses Transfers Discarding

S1 Chart (ex-MGB47, ex-MA/SB47)

S2

White, Cowes, UK: S1 Chart, S2

1940 // 8.1940: S1 Chart

requisitioned incomplete by UK 1940: S2

none

1945-46: S1 Chart



Technical data


Displacement standard, t

35

Displacement full, t

as designed: 39

as purchased: 40

Length, m

22.9

Breadth, m

5.08

Draught, m

as designed: 1.37 max

as purchased: 1.18 deep load

No of shafts

3

Machinery

as designed: 3 Isotta-Fraschini petrol engines

as purchased: 3 Packard petrol engines

Power, h. p.

as designed: 3450

as purchased: 3600

Max speed, kts

as designed: 45

as purchased: 41

Fuel, t

petrol 5

Endurance, nm(kts) 
Armament

as designed: 1 x 1 - 40/56 Bofors M/38, 1 x 2 - 7.9/92, 2 - 533 TT

as purchased: 1 х 1 - 20/70 Oerlikon Mk II/IV, 1 x 2 - 12.7/62, 2 x 2 - 7.7/94, 2 DC or 1 DCR (12) as ASW boat

Complement

12



Project history

Two MTBs of this class were ordered by Poland in Britain 24.1.1939, means for their building were collected on a subscription. Under the design they should have 2 533mm TTs, 1 single 40mm Bofors and two MGs. After beginning of war they were requisitioned by RN and completed as MGB47 and 48. Former before commission in October, 1940 was transferred to Polish Navy and renamed S1.

Modernizations

1940, S1 Chart: - 1 x 2 - 12.7/62, 2 x 2 - 7.7/94; + 4 x 2 - 7.9/92

Naval service

21.2.1944 S1 was laid up into reserve.