Exploration Cutter

[ledeper]

Auora Borealis, Baltic Confederation Exploration-cutter laid down 1909

Displacement:
   540 t light; 552 t standard; 580 t normal; 603 t full load

Dimensions: Length overall / water x beam x draught
   191,62 ft / 190,29 ft x 29,53 ft x 5,58 ft (normal load)
   58,41 m / 58,00 m x 9,00 m  x 1,70 m

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 550 ihp / 410 Kw = 12,00 kts
   Range 3.500nm at 6,00 kts
   Bunker at max displacement = 51 tons (100% coal)

Complement:
   58 - 76

Cost:
   £0,032 million / $0,126 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0,0 %
   Machinery: 90 tons, 15,5 %
   Hull, fittings & equipment: 200 tons, 34,5 %
   Fuel, ammunition & stores: 40 tons, 6,9 %
   Miscellaneous weights: 250 tons, 43,1 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     934 lbs / 424 Kg = 8,6 x 6 " / 152 mm shells or 0,5 torpedoes
   Stability (Unstable if below 1.00): 1,09
   Metacentric height 0,9 ft / 0,3 m
   Roll period: 12,7 seconds
   Steadiness   - As gun platform (Average = 50 %): 95 %
         - Recoil effect (Restricted arc if above 1.00): 0,00
   Seaboat quality  (Average = 1.00): 1,91

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,648
   Length to Beam Ratio: 6,44 : 1
   'Natural speed' for length: 13,79 kts
   Power going to wave formation at top speed: 39 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 5,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15,19 ft / 4,63 m
      - Forecastle (20 %):   9,65 ft / 2,94 m
      - Mid (50 %):      9,65 ft / 2,94 m
      - Quarterdeck (15 %):   9,65 ft / 2,94 m
      - Stern:      9,65 ft / 2,94 m
      - Average freeboard:   10,09 ft / 3,08 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 97,6 %
      - Above water (accommodation/working, high = better): 134,1 %
   Waterplane Area: 4.234 Square feet or 393 Square metres
   Displacement factor (Displacement / loading): 135 %
   Structure weight / hull surface area: 33 lbs/sq ft or 161 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,92
      - Longitudinal: 2,05
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, rides out heavy weather easily

[Ithekro]

What will be her purpose (aside from exploring the Arctic Ocean)?

[ledeper]

Exploring N-Est Greenland

[Borys]

Maybe armoured bow?
Borys

[maddox]

Just use a VTE, single compound steam engines are relics in those days

And as Borys says, an armored bow.

[The Rock Doctor]

I'd recommend a few things, given that the environment is severe and ports will be few and far between:

-Two shafts, instead of one, for redundancy

-At least double the range

-Trim for 50% steadiness, and therefore high stability - you may need it in stormy seas or in conditions of heavy ice accumulation

-Freeboard ought to be much higher, perhaps five to six metres, as the seas could be heavy.

-Armored ends is not a bad idea; a full length belt of an inch or two might actually help in dealing with light ice conditions

I like the miscelleanous weight and the excellent accomodation space, both would be needed for long expeditions.

[maddox]

60 tons heavier, but that is represented by the longer range, more wisc weight and an armored bow.

Auora Borealis, Baltic Exploration-cutter  laid down 1909

Displacement:
   599 t light; 612 t standard; 681 t normal; 736 t full load

Dimensions: Length overall / water x beam x draught
   196,85 ft / 196,85 ft x 29,53 ft x 5,58 ft (normal load)
   60,00 m / 60,00 m x 9,00 m  x 1,70 m

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Ends:   3,00" / 76 mm     30,00 ft / 9,14 m   6,52 ft / 1,99 m
     68,42 ft / 20,85 m Unarmoured ends

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   No drive to shaft, 2 shafts, 621 ihp / 464 Kw = 12,00 kts
   Range 8.000nm at 6,00 kts
   Bunker at max displacement = 123 tons (100% coal)

Complement:
   66 - 86

Cost:
   £0,028 million / $0,111 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0,0%
   Armour: 22 tons, 3,2%
      - Belts: 22 tons, 3,2%
      - Torpedo bulkhead: 0 tons, 0,0%
      - Armament: 0 tons, 0,0%
      - Armour Deck: 0 tons, 0,0%
      - Conning Tower: 0 tons, 0,0%
   Machinery: 48 tons, 7,0%
   Hull, fittings & equipment: 244 tons, 35,9%
   Fuel, ammunition & stores: 82 tons, 12,1%
   Miscellaneous weights: 285 tons, 41,9%

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1.600 lbs / 726 Kg = 14,8 x 6 " / 152 mm shells or 0,9 torpedoes
   Stability (Unstable if below 1.00): 1,19
   Metacentric height 1,1 ft / 0,3 m
   Roll period: 11,8 seconds
   Steadiness   - As gun platform (Average = 50 %): 52 %
         - 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: 0,735
   Length to Beam Ratio: 6,67 : 1
   'Natural speed' for length: 14,03 kts
   Power going to wave formation at top speed: 39 %
   Trim (Max stability = 0, Max steadiness = 100): 26
   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:      19,69 ft / 6,00 m
      - Forecastle (50%):   13,12 ft / 4,00 m
      - Mid (50%):      9,81 ft / 2,99 m
      - Quarterdeck (0%):   9,81 ft / 2,99 m
      - Stern:      9,81 ft / 2,99 m
      - Average freeboard:   12,78 ft / 3,90 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 69,1%
      - Above water (accommodation/working, high = better): 136,0%
   Waterplane Area: 4.805 Square feet or 446 Square metres
   Displacement factor (Displacement / loading): 169%
   Structure weight / hull surface area: 31 lbs/sq ft or 153 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,87
      - Longitudinal: 3,53
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Excellent seaboat, comfortable, rides out heavy weather easily

[ledeper]

Auora Borealis, Baltic Confederation Exploration-cutter  laid down 1909

Displacement:
   650 t light; 665 t standard; 743 t normal; 805 t full load

Dimensions: Length overall / water x beam x draught
   201,77 ft / 200,13 ft x 29,53 ft x 5,58 ft (normal load)
   61,50 m / 61,00 m x 9,00 m  x 1,70 m

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Ends:   3,00" / 76 mm     29,53 ft / 9,00 m   6,56 ft / 2,00 m
     170,60 ft / 52,00 m Unarmoured ends

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 665 ihp / 496 Kw = 12,00 kts
   Range 8.500nm at 6,00 kts
   Bunker at max displacement = 140 tons (100% coal)

Complement:
   70 - 92

Cost:
   £0,038 million / $0,152 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0,0 %
   Armour: 22 tons, 2,9 %
      - Belts: 22 tons, 2,9 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 0 tons, 0,0 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 0 tons, 0,0 %
   Machinery: 109 tons, 14,7 %
   Hull, fittings & equipment: 244 tons, 32,8 %
   Fuel, ammunition & stores: 93 tons, 12,5 %
   Miscellaneous weights: 276 tons, 37,1 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1.298 lbs / 589 Kg = 12,0 x 6 " / 152 mm shells or 0,7 torpedoes
   Stability (Unstable if below 1.00): 1,12
   Metacentric height 1,0 ft / 0,3 m
   Roll period: 12,4 seconds
   Steadiness   - As gun platform (Average = 50 %): 99 %
         - Recoil effect (Restricted arc if above 1.00): 0,00
   Seaboat quality  (Average = 1.00): 1,97

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0,789
   Length to Beam Ratio: 6,78 : 1
   'Natural speed' for length: 14,15 kts
   Power going to wave formation at top speed: 39 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 5,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      18,70 ft / 5,70 m
      - Forecastle (20 %):   13,09 ft / 3,99 m (9,81 ft / 2,99 m aft of break)
      - Mid (50 %):      9,81 ft / 2,99 m
      - Quarterdeck (15 %):   9,81 ft / 2,99 m
      - Stern:      9,81 ft / 2,99 m
      - Average freeboard:   10,91 ft / 3,33 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 88,5 %
      - Above water (accommodation/working, high = better): 136,6 %
   Waterplane Area: 5.117 Square feet or 475 Square metres
   Displacement factor (Displacement / loading): 144 %
   Structure weight / hull surface area: 33 lbs/sq ft or 161 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,92
      - Longitudinal: 2,00
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, rides out heavy weather easily

[maddox]

Why keeping the single compound steam-engine?

[ledeper]

Because I wanna small crew 12-15 men,and the machinery has to in the worst case be run by scientist and explorers.The expedition will include a stay for 2 or 3 winters so simple machinery is crucial in case of a break down (easy to repair)

[Carthaginian]

I'd also imagine that the SVE engine would run better on low-energy fuels like wood or the like.

[Blooded]

Good ideas Gentlemen,

I shall have to make some better Survey Vessels for the UNK. I will have to incorporate the ideas placed here.

Thanks for the info.