NAVYPEDIA

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.