WesWorld

Yam Class Fast Transport

Laid down 1935

Length, 92.5 m x Beam, 9.9 m x Depth, 3.4 m
1412 tonnes normal displacement (1244 tonnes standard)

Main battery: 1 x 12.5-cm
Secondary battery: 4 x 3.5-cm
AA battery: 8 x 1.5-cm

Weight of broadside: 30 kg

Hull unarmored

Battery armor:
Main, 3.0 cm shields / secondary, 2.0 cm shields
AA, 2.0 cm shields

Maximum speed for 8003 shaft kw = 24.28 knots
Approximate cruising radius, 7300 nm / 12 knots

Typical complement: 115-150


Estimated cost, $1.815 million (£454,000)

Remarks:

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.

Ship is roomy, with superior accommodation and working space.

Miscellaneous weight is:
-80 t: 4 x 10 t LCI, and davits for them
-240 t: Berthing for 120 troops
-30 t: Weight reserve and/or deck cargo

Distribution of weights:
Percent
normal
displacement:

Armament ......................... 8 tonnes = 1 pct
Armor, total ..................... 4 tonnes = 0 pct

Armament 4 tonnes = 0 pct

Machinery ........................ 309 tonnes = 22 pct
Hull and fittings; equipment ..... 540 tonnes = 38 pct
Fuel, ammunition, stores ......... 202 tonnes = 14 pct
Miscellaneous weights ............ 350 tonnes = 25 pct
-----
1412 tonnes = 100 pct

Estimated metacentric height, 0.3 m

Displacement summary:

Light ship: 1210 tonnes
Standard displacement: 1244 tonnes
Normal service: 1412 tonnes
Full load: 1541 tonnes

Loading submergence 541 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.05

Shellfire needed to sink: 827 kg = 30.6 x 12.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.7
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 67 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.08

Relative quality as a seaboat: 1.69

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.45
Sharpness coefficient: 0.32
Hull speed coefficient 'M' = 8.26
'Natural speed' for length = 17.4 knots
Power going to wave formation
at top speed: 57 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 103 percent

Relative accommodation and working space: 135 percent


Displacement factor: 136 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.92
(Structure weight per square
metre of hull surface: 242 kg)

Relative longitudinal hull strength: 2.22
(for 4.30 m average freeboard;
freeboard adjustment +1.18 m)

Relative composite hull strength: 1.00
(as Simmed by perdedor99 )

Class: Yam and Yimak

Type 1944 LCM

Licenced copies of the Bharati LCM

LCM-1 to -3, laid down 1944
LCM-4 to -11, laid down 1945
LCM-12 to -16, laid down 1946
LCM-17 to -20, laid down 1947

Type 1944 LCVP

Licence-built copies of the Bharati LCVP

LCVP-1 to -6, laid down 1944
LCVP-7 to -14, laid down 1945
LCVP-15 to -22, laid down 1946
LCVP-23 to -30, laid down 1947

Type 1945 LCT

See Bharati encyclopedia for details.

LCT-1 to -4, laid down 1945
LCT-4 to -8, laid down 1946