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
What will be her purpose (aside from exploring the Arctic Ocean)?
Exploring N-Est Greenland
Maybe armoured bow?
Borys
Just use a VTE, single compound steam engines are relics in those days
And as Borys says, an armored bow.
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.
60 tons heavier, but that is represented by the longer range, more wisc weight and an armored bow.
QuoteAuora 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
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
Why keeping the single compound steam-engine?
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)
I'd also imagine that the SVE engine would run better on low-energy fuels like wood or the like.
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.