Tugboat

[Borys]

Tugboats


Tophane Class - 1904
Tophane, laid down 1904
Boyana, laid down 1904
Çatalca, laid down 1904
Oltanica, laid down 1904
Suda, laid down 1904
?eref Nüma, laid down 1904

Tophane Class

These are multipurpose vessels, intended for tugboat purposes, firefighting, water transport, and minor coastal and riverine patrol.

Tophane, laid down 1904
Boyana, laid down 1904
Çatalca, laid down 1904
Oltanica, laid down 1904
Suda, laid down 1904
?eref Nüma, laid down 1904

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Tophane, Ottoman tugboat laid down 1904

Displacement:
89 t light; 92 t standard; 109 t normal; 123 t full load

Dimensions: Length overall / water x beam x draught
79.72 ft / 79.72 ft x 16.73 ft x 4.92 ft (normal load)
24.30 m / 24.30 m x 5.10 m x 1.50 m

Armament:
2 - 0.59" / 15.0 mm guns (1x2 guns), 0.10lbs / 0.05kg shells, 1904 Model
Machine guns in deck mount
on side amidships
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 100

Armour:

Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 1 shaft, 250 ihp / 187 Kw = 11.84 kts
Range 3,000nm at 8.00 kts
Bunker at max displacement = 31 tons (100% coal)

Complement:
16 - 21

Cost:
£0.009 million / $0.037 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 0 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 43 tons, 39.3 %
Hull, fittings & equipment: 32 tons, 29.0 %
Fuel, ammunition & stores: 19 tons, 17.9 %
Miscellaneous weights: 15 tons, 13.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
76 lbs / 34 Kg = 737.5 x 0.6 " / 15 mm shells or 0.1 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 0.5 ft / 0.2 m
Roll period: 9.8 seconds
Steadiness - As gun platform (Average = 50 %): 74 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.38

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.580
Length to Beam Ratio: 4.76 : 1
'Natural speed' for length: 8.93 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 9.81 ft / 2.99 m
- Forecastle (20 %): 6.23 ft / 1.90 m
- Mid (55 %): 6.23 ft / 1.90 m
- Quarterdeck (15 %): 6.23 ft / 1.90 m
- Stern: 6.23 ft / 1.90 m
- Average freeboard: 6.52 ft / 1.99 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 142.4 %
- Above water (accommodation/working, high = better): 69.3 %
Waterplane Area: 933 Square feet or 87 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 20 lbs/sq ft or 96 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 6.09
- Overall: 1.03
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily