Parthian vessels 1916 onwards

[Kaiser Kirk]

note to self : check range for 180L47s at max casement elevation (22? 25?)

[TacCovert4]

I would say that 32kt isn't but so different than 30.  Rule of thumb is you want a 3kt speed difference at a minimum to dictate an engagement.  You might find 32kt to be useful.   I've got a bunch of 32kt ships, but war experience seems to bear out that a 30kt ship with more armor is better than a 32kt ship without.

[Kaiser Kirk]

I have a bit of speed envy watching foreign cruisers zipping around....

Most of my Cruisers are 28-29, so 32 "seems like" a good margin over those, and high enough to not be slow for a while, allowing the ships to serve as the advance scout line, or detached duty in theaters they could be outnumbered.  The Royal Niseans, Mouleks, and Varyu/Vata are the only 30+ knot cruisers. 
I view slowly increasing that speed as a bit of future proofing. Varyu/Vata were FAST when laid down in 1911.

Still, the Royal Niseans seem like solid ships, and almost have enough guns.... so I think I will stick to them a bit longer.

But yes, between weather, seakeeping, hull fouling, and boiler wear, "max speed" can be a bit variable.
Not to mention different nations had varying safety margins on their engines, and some countries 'cheated' on trials by testing incomplete ships.
There's a bit in Friedman's Destroyer book that alludes to the idea that the DDs really didn't make their speed in actual conditions.
For combats I take a look at the weather and sea state vs. SS seakeeping and freeboard/bow.

[Kaiser Kirk]

And now to a different topic.
The choice was made to do the simpler refit of the Asbara class ACs (8x10"), which is finishing in 1925.5.
I may eventually go back and spend more on them, but for now that will give me 8 ACs with 8x 255L47 guns. 
Due to the heavier shell and better gun tech, it's a better gun than the old 255L50.

The same will apply to the 333mm gun, which I designed for replacing the Gilgamesh class's 345L40.

The Gilgamesh class currently serves as an ageing tripwire in the territories, but if the NPCs are swanning around with battlefleets
like that, I want to improve the Gilgamesh and Enki classes so that my old PDs and DNs can serve as a second battlefleet and
deter folks like the Mayans if my main fleet is busy elsewhere.  If refitted, those 6 ships would have been interesting vs the Mayans.

Plus I'd actually feel pretty good about trying to force a night combat with these, they have...decent...belt armor.
The Gilgamesh class was designed back when ranges were still expected to be 6-8000m, and her belt armor was meant to defeat her own gun at that range.
That's why it's a 420mm belt with a 65mm protective deck backing it.

There's two versions of this refit.
This is Version 1 - Electric drive, but no TDS.

Total : $15.643, 5.9bp
Means it costs me the tonnage of a cruiser....an eyewatering expensive cruiser, but I can find those funds.

Version 2... The original was turbine driven, so doesn't HAVE to go to electric,
so the 2nd version is geared and puts tonnage into a TDS. I believe it also sacrifices the internal box armor for that.
But I have only done the costing out of version 1 so far.

Gilgamesh R1925, Parthian Dreadnaught laid down 1906 (Engine 1925)

Displacement:
   22,941 t light; 24,570 t standard; 26,083 t normal; 27,293 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (538.06 ft / 531.50 ft) x 88.58 ft (Bulges 98.43 ft) x (29.53 / 30.77 ft)
   (164.00 m / 162.00 m) x 27.00 m (Bulges 30.00 m)  x (9.00 / 9.38 m)

Armament:
      10 - 13.11" / 333 mm 43.0 cal guns - 1,333.80lbs / 605.00kg shells, 99 per gun
     Breech loading guns in turret on barbette mounts, 1917 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     1 x Twin mount on centreline, forward deck aft
      16 - 5.12" / 130 mm 50.0 cal guns - 77.16lbs / 35.00kg shells, 300 per gun
     Quick firing guns in deck and hoist mounts, 1913 Model
     8 x 2-gun mounts on side ends, evenly spread
      4 raised mounts - superfiring
      12 - 5.12" / 130 mm 50.0 cal guns - 77.16lbs / 35.00kg shells, 300 per gun
     Quick firing guns in casemate mounts, 1913 Model
     12 x Single mounts on sides, evenly spread
      12 hull mounts in casemates- Limited use in heavy seas
      12 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 300 per gun
     Anti-air guns in deck mounts, 1917 Model
     4 x 2-gun mounts on side ends, evenly spread
      4 raised mounts
     2 x 2-gun mounts on centreline ends, evenly spread
      2 double raised mounts
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 500 per gun
     Machine guns in deck mounts, 1917 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 15,580 lbs / 7,067 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   16.5" / 420 mm   345.47 ft / 105.30 m   9.84 ft / 3.00 m
   Ends:   3.94" / 100 mm   185.99 ft / 56.69 m   9.84 ft / 3.00 m
   Upper:   5.31" / 135 mm   312.66 ft / 95.30 m   11.98 ft / 3.65 m
     Main Belt covers 100 % of normal length

   - Hull Bulges:
      0.47" / 12 mm   345.47 ft / 105.30 m   24.61 ft / 7.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   16.5" / 420 mm   7.09" / 180 mm      15.0" / 380 mm
   2nd:   1.97" / 50 mm   1.38" / 35 mm      1.38" / 35 mm
   3rd:   5.31" / 135 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.31" / 8 mm         -               -
   5th:   0.31" / 8 mm         -               -

   - Protected deck - multiple decks:
   For and Aft decks: 5.28" / 134 mm
   Forecastle: 2.36" / 60 mm  Quarter deck: 2.36" / 60 mm

   - Conning towers: Forward 16.54" / 420 mm, Aft 2.95" / 75 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 27,734 shp / 20,690 Kw = 20.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 2,723 tons

Complement:
   1,026 - 1,334

Cost:
   £2.081 million / $8.324 million

Distribution of weights at normal displacement:
   Armament: 2,348 tons, 9.0 %
      - Guns: 2,348 tons, 9.0 %
   Armour: 10,205 tons, 39.1 %
      - Belts: 3,637 tons, 13.9 %
      - Bulges: 149 tons, 0.6 %
      - Armament: 3,036 tons, 11.6 %
      - Armour Deck: 3,014 tons, 11.6 %
      - Conning Towers: 369 tons, 1.4 %
   Machinery: 900 tons, 3.5 %
   Hull, fittings & equipment: 8,647 tons, 33.2 %
   Fuel, ammunition & stores: 3,142 tons, 12.0 %
   Miscellaneous weights: 840 tons, 3.2 %
      - Hull below water: 412 tons
      - Bulge void weights: 10 tons
      - Hull above water: 48 tons
      - On freeboard deck: 60 tons
      - Above deck: 310 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     42,425 lbs / 19,244 Kg = 37.7 x 13.1 " / 333 mm shells or 5.1 torpedoes
   Stability (Unstable if below 1.00): 1.17
   Metacentric height 5.5 ft / 1.7 m
   Roll period: 17.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.70
   Seaboat quality  (Average = 1.00): 1.54

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.591 / 0.593
   Length to Beam Ratio: 5.40 : 1
   'Natural speed' for length: 23.05 kts
   Power going to wave formation at top speed: 46 %
   Trim (Max stability = 0, Max steadiness = 100): 46
   Bow angle (Positive = bow angles forward): 12.00 degrees
   Stern overhang: -6.56 ft / -2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  25.39 ft / 7.74 m,  22.54 ft / 6.87 m
      - Forward deck:   43.00 %,  22.54 ft / 6.87 m,  19.69 ft / 6.00 m
      - Aft deck:   22.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  13.12 ft / 4.00 m
      - Average freeboard:      18.19 ft / 5.54 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 55.3 %
      - Above water (accommodation/working, high = better): 113.2 %
   Waterplane Area: 34,146 Square feet or 3,172 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 194 lbs/sq ft or 948 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.99
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

1925 refurbishment of the Gilgamesh class.

Subtotal Costs :
A : Guns and Machinery
main :  584+1239 : 1823
second : 71+268 : 339
tertiary : 54+110 : 164
quint : 0.7+.53 : 1.23
Machinery : 900t

B: Armor + Func wt
Gun armor - main : 696
Sec :97
Tert : 110
Quad : 1.5
Quin : 3.9
+Deck (below) : 931
func Misc : 830

C: Trim only, no hull change

D: Fuel Ammo, stores
Magazines (unchanged or less tons) : 1107
Fuel  : 2723

Subtotals :
Base cost : 20% of 22990/1000 = $4.598

A: 2327.23+900 = 3227.23 /1000 = $(3.23*2), 3.23bp = $ 6.46, 3.23bp

B : 1835.5639 armor + 830 = 2665.5639 /1000 = $2.67 , 2.67bp

C : --

D: $(1107+2723)/2000 = $1.915

Total : $15.643, 5.9bp


New armanents 345->333, 165 ->130
bulletproof shields for 57mm , new 15mm


+Armor
35mm box around magazines + machinery :179
Laminate +30mm main deck (70/100/70) : 752
total : 931
Leave upper deck at 35mm
Box included in main deck armorwt.

Effective main belt + PD : 420 + (((65+30*.8)*1.5)/2) = 487mm

Effective verticle : 65+(30*.8)+(35/2) = 106.5mm

35mm box around mag & machinery is backing both of these.

Reserve : 10t

Misc Wt :
AD
235  FC 1918
25    LR radio
25    Hulesmeyer
25    Searchlight Tower (NF)

OD
5    Paravanes
40  2x Scoutfloatplanes
5    Gunpowder Cat
10  Hanger

HAW
23   CO2 Compressor AC
25   Additional pumps

HBW
162   Torpedo Nets
225   Turbogenerators
25t   Additional Pumps



Misc. Weight : 1922 BR

1t Const Resv.

AD
243t 1918 FC
25t   LR Radio
5t    Basic Night Fighting

OD
115t Additional Ventilation and evaporative cooling
5t     Paravanes

HBW
162t - torpedo nets
40t - 4x TT, 2 each beam, 20 x 18" Torpedoes


+ 6.0 forecastle, Top of upperbelt for 66%, 30mm protective deck
+3.5 weather, Top of upper belt for 33%
+1.5  Top of Main Belt
+1.0  3rd , Crown of 65mm protective deck
-1.5   2nd , bottom of belt, edge of protective deck, top of bulge
-4.0 1st
-8.56 Engineering Deck

[Kaiser Kirk]

This is version 2, a Reconstruction, with the higher base costs.
But in addition to the new guns, and laminated decks,
it upgrades the old oil-sprayed coal direct drive turbines to oil-fired geared turbines
and fits that shiny new power plant deep in the hull behind a TDS.

Not a first line battleship...in the daytime.
But a very tough 2nd rate battleship.
Certainly capable of opposing NPC battlewagons, or serving in the rear of the Parthian line.

The price of the reconstruction is even more wince-worthy,
but BP is the limiting factor for Parthia...and that's high too.
But still...just a cruiser.

And I'd rather have this than a 9400ton cruiser...I think.


Total :
BP :
9.35953 BP
$18.00916,

Gilgamesh Recon1925, Parthian Dreadnaught laid down 1906 (Engine 1925)

Displacement:
   22,956 t light; 24,570 t standard; 26,083 t normal; 27,293 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (538.06 ft / 531.50 ft) x 88.58 ft (Bulges 98.43 ft) x (29.53 / 30.77 ft)
   (164.00 m / 162.00 m) x 27.00 m (Bulges 30.00 m)  x (9.00 / 9.38 m)

Armament:
      10 - 13.11" / 333 mm 43.0 cal guns - 1,333.80lbs / 605.00kg shells, 99 per gun
     Breech loading guns in turret on barbette mounts, 1917 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     1 x Twin mount on centreline, forward deck aft
      16 - 6.50" / 165 mm 43.0 cal guns - 143.30lbs / 65.00kg shells, 250 per gun
     Quick firing guns in deck and hoist mounts, 1913 Model
     8 x 2-gun mounts on sides, evenly spread
      16 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck mounts, 1917 Model
     6 x 2-gun mounts on side ends, majority forward
      6 raised mounts
     2 x 2-gun mounts on centreline ends, evenly spread
      2 double raised mounts
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1917 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 15,738 lbs / 7,139 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   16.5" / 420 mm   345.47 ft / 105.30 m   9.84 ft / 3.00 m
   Ends:   Unarmoured
   Upper:   3.94" / 100 mm   312.66 ft / 95.30 m   11.98 ft / 3.65 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.50" / 38 mm   345.47 ft / 105.30 m   28.08 ft / 8.56 m
   Beam between torpedo bulkheads 55.77 ft / 17.00 m

   - Hull Bulges:
      0.35" / 9 mm   345.47 ft / 105.30 m   24.61 ft / 7.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   16.5" / 420 mm   7.09" / 180 mm      15.0" / 380 mm
   2nd:   1.38" / 35 mm   1.38" / 35 mm      1.38" / 35 mm
   4th:   0.31" / 8 mm         -               -
   5th:   0.31" / 8 mm         -               -

   - Protected deck - multiple decks:
   For and Aft decks: 5.31" / 135 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 2.76" / 70 mm

   - Conning towers: Forward 16.54" / 420 mm, Aft 2.95" / 75 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 27,734 shp / 20,690 Kw = 20.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 2,723 tons

Complement:
   1,026 - 1,334

Cost:
   £2.111 million / $8.445 million

Distribution of weights at normal displacement:
   Armament: 2,392 tons, 9.2 %
      - Guns: 2,392 tons, 9.2 %
   Armour: 10,069 tons, 38.6 %
      - Belts: 3,140 tons, 12.0 %
      - Torpedo bulkhead: 537 tons, 2.1 %
      - Bulges: 111 tons, 0.4 %
      - Armament: 2,919 tons, 11.2 %
      - Armour Deck: 2,992 tons, 11.5 %
      - Conning Towers: 369 tons, 1.4 %
   Machinery: 900 tons, 3.5 %
   Hull, fittings & equipment: 8,835 tons, 33.9 %
   Fuel, ammunition & stores: 3,127 tons, 12.0 %
   Miscellaneous weights: 760 tons, 2.9 %
      - Hull below water: 187 tons
      - Bulge void weights: 150 tons
      - Hull above water: 48 tons
      - On freeboard deck: 60 tons
      - Above deck: 315 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     42,620 lbs / 19,332 Kg = 37.8 x 13.1 " / 333 mm shells or 8.4 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 5.5 ft / 1.7 m
   Roll period: 17.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.74
   Seaboat quality  (Average = 1.00): 1.50

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.591 / 0.593
   Length to Beam Ratio: 5.40 : 1
   'Natural speed' for length: 23.05 kts
   Power going to wave formation at top speed: 46 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   Bow angle (Positive = bow angles forward): 12.00 degrees
   Stern overhang: -6.56 ft / -2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  25.39 ft / 7.74 m,  22.54 ft / 6.87 m
      - Forward deck:   45.00 %,  22.54 ft / 6.87 m,  19.69 ft / 6.00 m
      - Aft deck:   20.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  13.12 ft / 4.00 m
      - Average freeboard:      18.38 ft / 5.60 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 87.8 %
      - Above water (accommodation/working, high = better): 115.1 %
   Waterplane Area: 34,146 Square feet or 3,172 Square metres
   Displacement factor (Displacement / loading): 109 %
   Structure weight / hull surface area: 198 lbs/sq ft or 965 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.88
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

The reconstructed & TDS version of the refurbished ship
The redone engines can ft in the reduced beam.
The TDS can only be twinned 19mm (38mm) bulkheads,
but can be 5m inside the hull, behind a 1.5m deep anti-mine bulge, for 6.5m total depth.
Which should be very very difficult to penetrate.

To save weight, the engines need to be geared, not electric, and the end belts eliminated
The 35mm box around magazines and machinery can also be dropped.

The 165mm guns are kept, but the casements are removed
Upper belt is replaced with a lighter 100mm, but still facehardened and will
turn all light QF and bombs. Capped by upper deck.

1925 RECONSTRUCTION of the Gilgamesh class.

Subtotal Costs :
A : Guns and Machinery
main :  584+1239 : 1823
second : 115+426 : 541
tertiary : 8.4+20 : 28.4
quart : 0.7+.53 : 1.23
Machinery : 900t

Subtotal A: 3,293.63

B: Armor + Func wt
Gun armor - main : 696
Sec :116
Tert : 110
Quad : 2.0
Quin : 3.9
+Upper belt : 667
+Deck (below) : (2992-2078) = 914
+reskinned bulge : 111
+TDS : 537
func Misc : 610

Subtotal B : 3766.9

C: Trim, Forecastle extended aft, refit hull 
Change in light weight -34 tons.

D: Fuel Ammo, stores
Magazines ) : 1092
Fuel  : 2723

Subtotal D : 3815

Subtotals :
$ Base cost : 25% of 22990/1000 = $5.7475
BP Base Cost : 22.99/10 = 2.299 BP

A: 3293.63 / 1000 =  3.29363 BP, $6.58726

B : 3766.9 / 1000 = 3.7669, $3.7669 

C : Change in Lt disp x 2.... negative (null) cost.

D: $(3815)/2000 = $1.9075

Total :
BP :
9.35953 BP
$18.00916,


New armanents 345->333, 165 ->130
bulletproof shields for 57mm , new 15mm


+Armor 914
Laminate +40mm to main and quarter -- /65/30mm deck

Effective main belt + PD : 420 + (((65+40*.8)*1.5)/2) = 492.75mm

Effective verticle : 65+(40*.8)+(35/2) = 114.5mm


Reserve : 50t

Misc Wt :
AD
240  FC 1918
25    LR radio
25    Hulesmeyer
25    Searchlight Tower (NF)

OD
5    Paravanes
40  2x Scoutfloatplanes
5    Gunpowder Cat
10  Hanger

HAW
23   CO2 Compressor AC
25   Additional pumps

HBW
162   Torpedo Nets
25t   Additional Pumps

+ 6.0 forecastle, Top of upperbelt for 66%, 30mm protective deck
+3.5 weather, Top of upper belt for 33%
+1.5  Top of Main Belt
+1.0  3rd , Crown of 65mm protective deck
-1.5   2nd , bottom of belt, edge of protective deck, top of bulge
-4.0 1st
-8.56 Engineering Deck

[Jefgte]

...The price of the reconstruction is even more wince-worthy,
but BP is the limiting factor for Parthia...and that's high too...

Byzantine reconstruction for AC2, BB3 & BB4 in 1926-27 are expensive too, I have to significantly reduce LD for new hulls. But these old ships are always useful & they make numbers.
Similarly, the 8PDNs; BB1 and BB2 with their 254 guns require a big AC or DN to defeat them... They are also numbers.
Idem for 6 Parthian PDNs, Simurgh, Rokh & Tortoise.

[Kaiser Kirk]

My encyclopedia fell behind last fall, my available time went to the Mayan war, not Parthia.
The PDNs have been refurbished- it's in the Parthian ship design thread and various turn reports.
The refit and rearming of the Asbara class cruisers is finishing 1925.5.
I'm hoping to get the Encyclopedia and OOB all caught up by month's end.

On the Gilgamesh, I'm really trying to decide if a TDS is worth it.
Installing one is what triggers "Reconstruction", and drives the cost in $ and BP up.

Having a TDS drastically reduces the chance of a critical hit.
The Parthians use torpedo nets, but are well aware they fail ~30% of the time.

It's much cheaper without one, but I'd hate for the lack of one to be why I lost a big ship.
...but the 6BP vs. 9BP cost difference matters to my budget.

I am working on another version of the Reconstruction, but the cost will be about the same.

[The Rock Doctor]

I think it's not unreasonable to spend another 3 BP to get the TDS if you're already spending 6 to refurbish her.

Note - unless you're vanguarding it all - you'll get a decent amount of scrap back from junking the old guns, end armor, and engines, so that would knock the cost down a bit. 

[Kaiser Kirk]

I think it's not unreasonable to spend another 3 BP to get the TDS if you're already spending 6 to refurbish her.

Note - unless you're vanguarding it all - you'll get a decent amount of scrap back from junking the old guns, end armor, and engines, so that would knock the cost down a bit.

Fair or Foul, Snip's efforts to simplify rules really doesn't address scrapping parts. That may have been deliberate to keep the 'really detailed' and 'let it go' folks at the same balance.
So I have not planned on that for any of my refits.

I do mean to copy others and note the artillery removed. There may come a time when 345L40 monitors seem attractive, and the 165L45 guns were QF, and so still of merit.
Between the Smurghs, Gilgameshes and Enkis, that's 68 x 345L40....hey I wonder if I can figure out how to mount all 68 on ONE monitor.... I may need two monitors...

[Kaiser Kirk]

Reconstruction Version 2
A bit more tinkering with the TDS Reconstruction.

Total :
BP : 9.42653 = 9.43
$  : 18.11616 = 18.12

Gilgamesh Recon1925, Parthian Dreadnaught laid down 1906 (Engine 1925)

Displacement:
   22,956 t light; 24,570 t standard; 26,083 t normal; 27,293 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (538.06 ft / 531.50 ft) x 88.58 ft (Bulges 98.43 ft) x (29.53 / 30.77 ft)
   (164.00 m / 162.00 m) x 27.00 m (Bulges 30.00 m)  x (9.00 / 9.38 m)

Armament:
      10 - 13.11" / 333 mm 43.0 cal guns - 1,333.80lbs / 605.00kg shells, 99 per gun
     Breech loading guns in turret on barbette mounts, 1917 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     1 x Twin mount on centreline, forward deck aft
      16 - 6.50" / 165 mm 43.0 cal guns - 143.30lbs / 65.00kg shells, 250 per gun
     Quick firing guns in turret on barbette mounts, 1913 Model
     8 x 2-gun mounts on sides, evenly spread
      16 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Anti-air guns in deck mounts, 1917 Model
     6 x 2-gun mounts on side ends, majority forward
      6 raised mounts
     2 x 2-gun mounts on centreline ends, evenly spread
      2 double raised mounts
      16 - 0.59" / 15.0 mm 70.0 cal guns - 0.11lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1917 Model
     8 x Twin mounts on sides, evenly spread
      8 double raised mounts
      Weight of broadside 15,738 lbs / 7,139 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   16.5" / 420 mm   345.47 ft / 105.30 m   9.84 ft / 3.00 m
   Ends:   1.38" / 35 mm   185.99 ft / 56.69 m   9.84 ft / 3.00 m
   Upper:   2.95" / 75 mm   312.66 ft / 95.30 m   11.98 ft / 3.65 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.81" / 46 mm   345.47 ft / 105.30 m   28.08 ft / 8.56 m
   Beam between torpedo bulkheads 52.49 ft / 16.00 m

   - Hull Bulges:
      0.35" / 9 mm   345.47 ft / 105.30 m   24.61 ft / 7.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   16.5" / 420 mm   7.09" / 180 mm      15.0" / 380 mm
   2nd:   1.38" / 35 mm   1.38" / 35 mm      1.38" / 35 mm
   4th:   0.31" / 8 mm         -               -
   5th:   0.31" / 8 mm         -               -

   - Protected deck - multiple decks:
   For and Aft decks: 5.31" / 135 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 2.76" / 70 mm

   - Conning towers: Forward 16.54" / 420 mm, Aft 2.95" / 75 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 27,734 shp / 20,690 Kw = 20.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 2,723 tons

Complement:
   1,026 - 1,334

Cost:
   £2.111 million / $8.445 million

Distribution of weights at normal displacement:
   Armament: 2,433 tons, 9.3 %
      - Guns: 2,433 tons, 9.3 %
   Armour: 10,261 tons, 39.3 %
      - Belts: 3,065 tons, 11.8 %
      - Torpedo bulkhead: 650 tons, 2.5 %
      - Bulges: 111 tons, 0.4 %
      - Armament: 3,073 tons, 11.8 %
      - Armour Deck: 2,992 tons, 11.5 %
      - Conning Towers: 369 tons, 1.4 %
   Machinery: 900 tons, 3.5 %
   Hull, fittings & equipment: 8,447 tons, 32.4 %
   Fuel, ammunition & stores: 3,127 tons, 12.0 %
   Miscellaneous weights: 913 tons, 3.5 %
      - Hull below water: 412 tons
      - Bulge void weights: 75 tons
      - Hull above water: 48 tons
      - On freeboard deck: 60 tons
      - Above deck: 318 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     38,831 lbs / 17,614 Kg = 34.5 x 13.1 " / 333 mm shells or 8.1 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 5.3 ft / 1.6 m
   Roll period: 18.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.64
   Seaboat quality  (Average = 1.00): 1.34

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.591 / 0.593
   Length to Beam Ratio: 5.40 : 1
   'Natural speed' for length: 23.05 kts
   Power going to wave formation at top speed: 46 %
   Trim (Max stability = 0, Max steadiness = 100): 52
   Bow angle (Positive = bow angles forward): 12.00 degrees
   Stern overhang: -6.56 ft / -2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  25.43 ft / 7.75 m,  22.97 ft / 7.00 m
      - Forward deck:   25.00 %,  22.97 ft / 7.00 m,  21.00 ft / 6.40 m
      - Aft deck:   40.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
      - Quarter deck:   15.00 %,  11.48 ft / 3.50 m,  13.12 ft / 4.00 m
      - Average freeboard:      16.72 ft / 5.10 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 94.8 %
      - Above water (accommodation/working, high = better): 98.4 %
   Waterplane Area: 34,146 Square feet or 3,172 Square metres
   Displacement factor (Displacement / loading): 108 %
   Structure weight / hull surface area: 194 lbs/sq ft or 946 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.94
      - Longitudinal: 1.63
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

V2 -
Moves the 2-gun 165mm to turrets, still just splinter armor, but should
ensure a good rotation and engagement rate.
This also reconfigures the forecastle deck from 43% to 30%
Not sure what that means for Q barbette, never have figured out how SS accounts
for barbette armor, I think off average freeboard, instead of location.
Anyhow, lowering a barbette is far more doable than raising one, and it is recon.

Costs a little seakeeping, but
frees up top weight and allows the
TDS to have an additional 8mm unpierced
flooding bulkhead inboard.
The casements and upperbelt are still replaced,
but with an single 75mm upper belt.
This allows the end belts to be retained, albeit thinner.

The minimal weight for turbogenerators
is now 'affordable' , allowing electric drive.

This means the TDS can be 5.5m deep + 1.5m bulge on each side.
Conceptually that means :
The 2x19mm holding bulkhead can be 4.0m inside the hull, and 5.5m from the outer bulge,
plenty of room for liquid/void compartments with mild steel separators.
and then a 1.5m wide passage with an 8mm unpierced flooding bulkhead will both control
leaks/displacement, and provide damage control access behind the TDS.

Still not as thick my most recent ships, but from what I understand of the theory of TDS,
should be one that would perform well 'real world', mainly due to the standoff distance.

The Electric drive means unit layout, and short propeller shafts, better maneuverability plus fuel savings,
giving a 8,165nm range.

Armor as previous :
+Armor 914
Laminate +40mm to main and quarter -- /65/30mm deck

Effective main belt + PD : 420 + (((65+40*.8)*1.5)/2) = 492.75mm

Effective vertical : 65+(40*.8)+(35/2) = 114.5mm

Should make it a tough ship, hard to put down.

Subtotal Costs :
A : Guns and Machinery
main :  584+1239 : 1823
second : 115+466 : 581
tertiary : 8.4+20 : 28.4
quart : 0.7+.53 : 1.23
Machinery : 900t

Subtotal A: 3,333.63

B: Armor + Func wt
Gun armor - main : 696  (just turret)
Sec :215 (all new)
Tert : 2
Quad : 2.0
Quin : 3.9
+Upper belt : 499
+end belts : 93
+Deck (below) : (2992-2078) = 914
+reskinned bulge : 111
+TDS : 650
func Misc : 610

Subtotal B : 3793.9

C: Trim, Forecastle deck trimmed,  refit hull 
Change in light weight -34 tons.
Cost : twice change...so nothing.
The increased cost of Reconstruction must pay for it.

D: Fuel Ammo, stores
Magazines ) : 1092
Fuel  : 2723

Subtotal D : 3815

Subtotals :
$ Base cost : 25% of 22990/1000 = $5.7475
BP Base Cost : 22.99/10 = 2.299 BP

A: 3333.63 / 1000 =  3.33363 BP, $6.66726

B : 3793.9 / 1000 = 3.7939 BP, $3.7939

C : Change in Lt disp x 2.... negative (null) cost.

D: $(3815)/2000 = $1.9075

Total :
BP : 9.42653 = 9.43
$  : 18.11616 = 18.12

Reserve : 75t

Misc Wt :
AD
243  FC 1918
25    LR radio
25    Hulesmeyer
25    Searchlight Tower (NF)

OD
5    Paravanes
40  2x Scoutfloatplanes
5    Gunpowder Cat
10  Hanger

HAW
23   CO2 Compressor AC
25   Additional pumps

HBW
162   Torpedo Nets
25t   Additional Pumps

+ 6.0 forecastle, Top of upperbelt for 66%, 30mm protective deck
+3.5 weather, Top of upper belt for 33%
+1.5  Top of Main Belt
+1.0  3rd , Crown of 65mm protective deck
-1.5   2nd , bottom of belt, edge of protective deck, top of bulge
-4.0 1st
-8.56 Engineering Deck

[Kaiser Kirk]

With the apparent possibility of 68 x 345L40 barrels for equipping Monitors,
I decided to give one a try.

1- Protected against marauding cruisers
2- Protected vs plunging return fire
3- Protected vs Aerial attack (bombs, torpedoes)
4- use HMS Agincourt as guide as to how to efficiently mount big guns
5- use quads instead of twins...

Ta-da, the Imperial Parthian Navy Monitor "Lizard"

It's a little larger than I like.
But would make a very impressive shore bombardment vessel.

IPN Lizard, Parthian Monitor laid down 1926

Displacement:
   42,783 t light; 47,995 t standard; 50,156 t normal; 51,884 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (761.15 ft / 754.59 ft) x 111.55 ft (Bulges 118.11 ft) x (31.17 / 32.12 ft)
   (232.00 m / 230.00 m) x 34.00 m (Bulges 36.00 m)  x (9.50 / 9.79 m)

Armament:
      28 - 13.58" / 345 mm 40.0 cal guns - 1,201.52lbs / 545.00kg shells, 200 per gun
     Breech loading guns in turret on barbette mounts, 1926 Model
     7 x 4-gun mounts on centreline, evenly spread
      3 raised mounts
      16 - 6.50" / 165 mm 43.0 cal guns - 143.30lbs / 65.00kg shells, 200 per gun
     Breech loading guns in casemate mounts, 1926 Model
     16 x Single mounts on side ends, evenly spread
      16 hull mounts in casemates- Limited use in heavy seas
      24 - 3.54" / 90.0 mm 50.0 cal guns - 24.25lbs / 11.00kg shells, 500 per gun
     Anti-air guns in deck and hoist mounts, 1926 Model
     12 x 2-gun mounts on side ends, evenly spread
      4 raised mounts - superfiring
      20 - 2.24" / 57.0 mm 60.0 cal guns - 6.61lbs / 3.00kg shells, 600 per gun
     Quick firing guns in deck and hoist mounts, 1926 Model
     8 x 2-gun mounts on side ends, evenly spread
      8 raised mounts
     2 x 2-gun mounts on sides forward
      2 double raised mounts
      32 - 0.59" / 15.0 mm 70.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1926 Model
     16 x Twin mounts on sides, evenly spread
      16 double raised mounts
      Weight of broadside 36,653 lbs / 16,626 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   5.91" / 150 mm   490.49 ft / 149.50 m   17.72 ft / 5.40 m
   Ends:   1.97" / 50 mm   264.07 ft / 80.49 m   17.72 ft / 5.40 m
   Upper:   1.97" / 50 mm   490.49 ft / 149.50 m   8.01 ft / 2.44 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      2.24" / 57 mm   490.49 ft / 149.50 m   39.27 ft / 11.97 m
   Beam between torpedo bulkheads 95.14 ft / 29.00 m

   - Hull Bulges:
      0.35" / 9 mm   490.49 ft / 149.50 m   22.97 ft / 7.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.91" / 150 mm   5.91" / 150 mm      5.91" / 150 mm
   2nd:   1.97" / 50 mm   1.97" / 50 mm      1.97" / 50 mm
   3rd:   0.98" / 25 mm   0.98" / 25 mm      0.98" / 25 mm
   4th:   0.31" / 8 mm         -               -
   5th:   0.31" / 8 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 5.91" / 150 mm
   Forecastle: 1.97" / 50 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 5.91" / 150 mm, Aft 1.97" / 50 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 3 shafts, 103,032 shp / 76,862 Kw = 26.00 kts
   Range 6,600nm at 14.00 kts
   Bunker at max displacement = 3,889 tons

Complement:
   1,675 - 2,178

Cost:
   £17.009 million / $68.035 million

Distribution of weights at normal displacement:
   Armament: 6,813 tons, 13.6 %
      - Guns: 6,813 tons, 13.6 %
   Armour: 14,649 tons, 29.2 %
      - Belts: 2,909 tons, 5.8 %
      - Torpedo bulkhead: 1,599 tons, 3.2 %
      - Bulges: 148 tons, 0.3 %
      - Armament: 3,649 tons, 7.3 %
      - Armour Deck: 6,113 tons, 12.2 %
      - Conning Towers: 231 tons, 0.5 %
   Machinery: 3,298 tons, 6.6 %
   Hull, fittings & equipment: 17,341 tons, 34.6 %
   Fuel, ammunition & stores: 7,373 tons, 14.7 %
   Miscellaneous weights: 682 tons, 1.4 %
      - Above deck: 682 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     60,428 lbs / 27,410 Kg = 48.2 x 13.6 " / 345 mm shells or 9.6 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 8.5 ft / 2.6 m
   Roll period: 17.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 57 %
         - Recoil effect (Restricted arc if above 1.00): 0.75
   Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
   Hull has rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.632 / 0.634
   Length to Beam Ratio: 6.39 : 1
   'Natural speed' for length: 27.47 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 12.00 degrees
   Stern overhang: -6.56 ft / -2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  30.51 ft / 9.30 m,  28.05 ft / 8.55 m
      - Forward deck:   20.00 %,  28.05 ft / 8.55 m,  25.59 ft / 7.80 m
      - Aft deck:   45.00 %,  17.72 ft / 5.40 m,  17.72 ft / 5.40 m
      - Quarter deck:   15.00 %,  17.72 ft / 5.40 m,  17.72 ft / 5.40 m
      - Average freeboard:      21.80 ft / 6.65 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 93.7 %
      - Above water (accommodation/working, high = better): 148.0 %
   Waterplane Area: 63,419 Square feet or 5,892 Square metres
   Displacement factor (Displacement / loading): 100 %
   Structure weight / hull surface area: 240 lbs/sq ft or 1,171 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.27
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room



7.8
5.4     Top of Upper belt, upper armor deck 50mm
2.9     Top of belt, armor deck 100mm, top of TDS
0.4
-1.9
         -2.5 Bottom of belt

[The Rock Doctor]

I'm surprised that it works, but it works.

[Kaiser Kirk]

I'm surprised that it works, but it works.

Recoil gave me some issues.
....and I really wanted to have 345L40mm casements, but that didn't work out.

[Kaiser Kirk]

Parthia's ancient minelayers have long been on the 'to replace' list.
Rocky's idea of a destroyer based minelayer made me want to have a try.

The total mineload makes it a rather expensive vessel,
but the high speed and high sustained cruise speed do make
it capable of offensive laying in enemy waters.

Some minelaying is handwaved as part of coastal defenses, but if you want to mine a specific spot...
minelayers are helpful. Some Parthian cruisers have this ability... but

The ship can sustain 30knots for 30 hours, allowing a rapid dash out 450nm and back,
or it can manage a 1100nm radius at 22knots.

Sahog (Hare), Parthian ML Corvette laid down 1926

Displacement:
   1,500 t light; 1,568 t standard; 1,865 t normal; 2,103 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (392.94 ft / 387.14 ft) x 36.75 ft x (10.93 / 11.86 ft)
   (119.77 m / 118.00 m) x 11.20 m  x (3.33 / 3.62 m)

Armament:
      4 - 4.72" / 120 mm 43.0 cal guns - 51.50lbs / 23.36kg shells, 220 per gun
     Quick firing guns in deck mounts, 1926 Model
     2 x 2-gun mounts on centreline, forward evenly spread
      1 raised mount
      4 - 2.24" / 57.0 mm 60.0 cal guns - 6.19lbs / 2.81kg shells, 350 per gun
     Anti-air guns in deck mounts, 1926 Model
     2 x 2-gun mounts on sides forward
      2 raised mounts
      8 - 0.59" / 15.0 mm 70.0 cal guns - 0.12lbs / 0.05kg shells, 2,500 per gun
     Anti-air guns in deck mounts, 1926 Model
     2 x 2 row quad mounts on centreline ends, evenly spread
      2 double raised mounts
      Weight of broadside 232 lbs / 105 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.24" / 6 mm         -               -
   3rd:   0.24" / 6 mm         -               -
   4th:   0.24" / 6 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 34,243 shp / 25,545 Kw = 32.00 kts
   Range 2,300nm at 22.00 kts
   Bunker at max displacement = 534 tons

Complement:
   141 - 184

Cost:
   £0.675 million / $2.698 million

Distribution of weights at normal displacement:
   Armament: 42 tons, 2.3 %
      - Guns: 42 tons, 2.3 %
   Armour: 2 tons, 0.1 %
      - Armament: 2 tons, 0.1 %
   Machinery: 938 tons, 50.3 %
   Hull, fittings & equipment: 430 tons, 23.0 %
   Fuel, ammunition & stores: 365 tons, 19.6 %
   Miscellaneous weights: 88 tons, 4.7 %
      - Hull void weights: 5 tons
      - Hull above water: 2 tons
      - On freeboard deck: 72 tons
      - Above deck: 9 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     541 lbs / 245 Kg = 10.3 x 4.7 " / 120 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.36
   Metacentric height 1.9 ft / 0.6 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.16
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.420 / 0.436
   Length to Beam Ratio: 10.54 : 1
   'Natural speed' for length: 19.68 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  21.65 ft / 6.60 m,  19.03 ft / 5.80 m
      - Forward deck:   28.00 %,  19.03 ft / 5.80 m,  16.73 ft / 5.10 m
      - Aft deck:   37.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Quarter deck:   15.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Average freeboard:      13.46 ft / 4.10 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 169.5 %
      - Above water (accommodation/working, high = better): 150.5 %
   Waterplane Area: 8,869 Square feet or 824 Square metres
   Displacement factor (Displacement / loading): 78 %
   Structure weight / hull surface area: 31 lbs/sq ft or 150 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.91
      - Overall: 0.53
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

The Sahog, or Hare class uses the hull of the Palang Oceanic Destroyer as the basis for a high speed minelayer.

The fast, agile nature, along with the ability to leave little pellets behind led to the name.


The main battery is two two-gun  mounts mounted foreward, leaving a clear mine deck aft.

Amidships is an elevated platform between the torpedo tubes, aranged en echelon are the two pairs of 57mm AA. This allows good sky arcs, and good engagement on the opposite broadside

For/aft, Paired twin GAST 15mm
are mounted to allow engagement of any plane seeking to strafe the length of the ship. These can also bear on the beam.

All guns are given bulletproof 1/4" (6mm) spray shields.


5T - Construction reserve

AD:
4.5t - FC
0t - SR Radio
4.5t - NF Gear

OD:
2t - Lt. MS Paravanes
0t - 2 stern rails
70t - 70 mines

HAW
1.5t - CO2 Air Compressor AC

HBW



Range :
This class is meant to be a fast minelayer,
so sustained high speed is important.
The savings from the geared turbines forms the 'emergency reserve', of 640nm at 16knts.

The 534 tons of fuel oil allows :

30.9 hours at 30 knots for 928nm.

31.6 hours at 29.85kts (75% power) (943nm)

104 hours at 22 knots. (2300nm at 22knts)

325 hours (13.5days) at 16knots (5210nm at 16knots

[The Rock Doctor]

I think that could certainly be useful.