You are not logged in.

Dear visitor, welcome to WesWorld. If this is your first visit here, please read the Help. It explains in detail how this page works. To use all features of this page, you should consider registering. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here.

1

Tuesday, March 2nd 2010, 5:29pm

Lightship design (Merchant)

(Great Thanks to BrockPaine for the SIM!!)

Lightship, Chile, Peru, Etc Lightship laid down 1938

Displacement:
462 t light; 478 t standard; 784 t normal; 1,029 t full load

Dimensions: Length overall / water x beam x draught
193.50 ft / 181.50 ft x 28.00 ft x 12.00 ft (normal load)
58.98 m / 55.32 m x 8.53 m x 3.66 m

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Geared drive, 1 shaft, 598 ihp / 446 Kw = 12.00 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 552 tons

Complement:
73 - 96

Cost:
£0.117 million / $0.469 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 33 tons, 4.2 %
Hull, fittings & equipment: 249 tons, 31.7 %
Fuel, ammunition & stores: 322 tons, 41.1 %
Miscellaneous weights: 180 tons, 23.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,226 lbs / 1,010 Kg = 20.6 x 6 " / 152 mm shells or 1.6 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 0.9 ft / 0.3 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.450
Length to Beam Ratio: 6.48 : 1
'Natural speed' for length: 13.47 kts
Power going to wave formation at top speed: 38 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 25.12 degrees
Stern overhang: 4.50 ft / 1.37 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.00 ft / 4.88 m
- Forecastle (20 %): 12.00 ft / 3.66 m
- Mid (50 %): 9.00 ft / 2.74 m
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 11.17 ft / 3.40 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 40.0 %
- Above water (accommodation/working, high = better): 82.4 %
Waterplane Area: 3,089 Square feet or 287 Square metres
Displacement factor (Displacement / loading): 318 %
Structure weight / hull surface area: 40 lbs/sq ft or 195 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 5.27
- Overall: 1.13
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, rides out heavy weather easily

368 tons ballast simmed as bunker fuel


2

Tuesday, March 2nd 2010, 11:23pm

Great drawing!

3

Wednesday, March 3rd 2010, 6:21pm

Thank-you! Any one Interesting to have one? Very in wish by your sailors :P

4

Wednesday, March 3rd 2010, 6:55pm

It's too nice not to post:


Keep up the good work.

5

Wednesday, March 3rd 2010, 7:04pm

Thank-you!!