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LSM Class, Allied Landing Ships


Photograph of LSM unloading

Naval Historical Center #NH 104587

Schematic diagram of LSM

ONI 226


Specifications:


Tonnage 740 tons loaded for beach run
Dimensions 203'6" by 34'6"
6.20m by 10.52m
Maximum speed       12 knots
Complement 50 to 60
Armament 40mm Bofors AA guns
Protection
0.25" (6mm) STS splinter protection around conning station, pilot house, and gun mounts
Machinery
2-shaft diesel (2880 bhp)
Range
4900 nautical miles (9000 km) at 12 knots
Passengers
48
Cargo
165 tons
5 medium or 3 heavy tanks or 6 LVTs or 9 DUKWs
Modifications
Some versions appear to have been armed with 8 20mm Oerlikon in place of the Bofors.


Landing Ships, Medium, or LSMs, were a kind of cross between the LST and the LCT, combining the sea keeping qualities of the former with the carrying capacity of the latter.  This afforded greater strategic flexibility by allowing an amphibious force to be loaded at a port at a considerable distance from the objective.  About 528 were produced from April 1944 to the end of the war.

As with the other larger landing ship classes, some LSMs were converted to fire support ships by giving them heavier armament, particularly 5" (127mm) rockets.  The LSM conversions had automatic reloaders and could launch 30 rockets a minute.

Numbers in the Pacific:

1943-9      

60

1944-1

105

1944-5

113

Photo Gallery

Overhead view of LSM

U.S. Navy

ONI 226 page on LSM

ONI 226

ONI 226 page on LSM

ONI 226

Pilot house of LSM

Navsource.org


References

Friedman (2002)
Leighton and Coakley (1955)

NavSource.org (accessed 2009-12-26)



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