WesWorld

As you may have noticed, I like to make use of pieces of old ships. Well here's another one!

It's the hull of an Estafey class predreadnought, with guns, armor and superstructure removed, and replaced with a large crane amidships. As a total guess, I figure a rotating crane capable of lifting ~250 tons might weigh 1,000 tons, leaving 4,000 tons misc weight to carry construction stuff. Anyone here with the engineering background to supply a better guess for the crane weight?

Its main use will be to support major construction projects in coastal areas with poor infrastructure.

I plan to do the same with the hull of the Tsesarevich, of similar displacement and dimensions.

One last question: Would the rebuilding rules apply, or the reconstruction rules?


Russian mobile crane, laid down 1903

Length, 117.6 m x Beam, 22.6 m x Depth, 8.2 m
13184 tonnes normal displacement (9302 tonnes standard)

Main battery: 1 x 1.3-cm

Weight of broadside: 0 kg

Hull unarmored

Maximum speed for 6374 indicated kw = 16.00 knots
Approximate cruising radius, 25800 nm / 10 knots

Typical complement: 307-400


Estimated cost, $1.979 million (£495,000)

Remarks:

Ship has slow, easy roll; a good, steady gun platform.

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

Magazines and engineering spaces are roomy, with superior
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Machinery ........................ 1275 tonnes = 10 pct
Hull and fittings; equipment ..... 2763 tonnes = 21 pct
Fuel, ammunition, stores ......... 4146 tonnes = 31 pct
Miscellaneous weights ............ 5000 tonnes = 38 pct
-----
13184 tonnes = 100 pct

Estimated metacentric height, 1.1 m

Displacement summary:

Light ship: 9038 tonnes
Standard displacement: 9302 tonnes
Normal service: 13184 tonnes
Full load: 16236 tonnes

Loading submergence 1903 tonnes/metre

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.09

Shellfire needed to sink: 6728 kg = 220796.0 x 1.3-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 2.4
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 70 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.00

Relative quality as a seaboat: 1.69

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


Hull form characteristics:

Block coefficient: 0.60
Sharpness coefficient: 0.45
Hull speed coefficient 'M' = 4.99
'Natural speed' for length = 19.6 knots
Power going to wave formation
at top speed: 43 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 73 percent

Relative accommodation and working space: 82 percent


Displacement factor: 175 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.04
(Structure weight per square
metre of hull surface: 465 kg)

Relative longitudinal hull strength: 1.92
(for 4.00 m average freeboard;
freeboard adjustment -0.88 m)

Relative composite hull strength: 1.10

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


[Machine-readable parameters: Spring Style v. 1.2.1]

385.73 x 74.13 x 26.90; 13.12 -- Dimensions
0.60 -- Block coefficient
1903 -- Year laid down
16.00 / 25800 / 10.00; Reciprocating -- Speed / radius / cruise
5000 tons -- Miscellaneous weights
++++++++++
1 x 0.51; 0 -- Main battery; turrets
Central positioning of guns
:
0 -- No secondary battery
0 -- No tertiary (QF/AA) battery
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
0.00 -- No battery armor


(Note: For portability, values are stored in Anglo-American units)


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

Changing or removing the belt armor has been considered reconstruction, as I recall.

An interesting idea, though the ship's draught may be a problem in places.

I seem to recall that a couple of US predreads had similar fates - I think they were used to lift BB turrets into place or something. Assuming you haven't already looked into them, they may be a source of info on the crane weights.

One of these days you've gotta start posting drawings of these creations...

J