Iberia 1910+

[The Rock Doctor]

High freeboard will do that, but it looks like he can trim a fair bit toward stability.

[Darman]

I did not notice the stability issue the first time around but I trimmed it a little to get rid of that issue.  I also added a protective deck (25/50/25mm) because I was thinking it would help since there will be multiple large devices on deck (MTBs) and lots of torpedoes and other heavy pieces of equipment being dropped. 

Enter ship name, Iberia MTB Depot Ship laid down 1914

Displacement:
   5,807 t light; 6,023 t standard; 7,521 t normal; 8,719 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (396.98 ft / 396.98 ft) x 52.49 ft x (22.97 / 25.85 ft)
   (121.00 m / 121.00 m) x 16.00 m  x (7.00 / 7.88 m)

Armament:
      10 - 3.54" / 90.0 mm 50.0 cal guns - 23.55lbs / 10.68kg shells, 500 per gun
     Quick firing guns in deck mounts, 1912 Model
     8 x Single mounts on sides amidships
     2 x Single mounts on centreline ends, evenly spread
      Weight of broadside 235 lbs / 107 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm         -               -

   - Protected deck - single deck: 1.97" / 50 mm For and Aft decks
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 3.94" / 100 mm,  Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 13,436 shp / 10,023 Kw = 20.00 kts
   Range 10,000nm at 15.00 kts
   Bunker at max displacement = 2,696 tons

Complement:
   403 - 524

Cost:
   £0.367 million / $1.469 million

Distribution of weights at normal displacement:
   Armament: 48 tons, 0.6 %
   Armour: 535 tons, 7.1 %
      - Armament: 18 tons, 0.2 %
      - Armour Deck: 484 tons, 6.4 %
      - Conning Tower: 33 tons, 0.4 %
   Machinery: 518 tons, 6.9 %
   Hull, fittings & equipment: 2,797 tons, 37.2 %
   Fuel, ammunition & stores: 1,714 tons, 22.8 %
   Miscellaneous weights: 1,910 tons, 25.4 %
      - Hull above water: 1,000 tons
      - On freeboard deck: 850 tons
      - Above deck: 60 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     23,180 lbs / 10,514 Kg = 1,042.1 x 3.5 " / 90 mm shells or 4.0 torpedoes
   Stability (Unstable if below 1.00): 1.04
   Metacentric height 2.1 ft / 0.6 m
   Roll period: 15.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.08
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.566
   Length to Beam Ratio: 7.56 : 1
   'Natural speed' for length: 19.92 kts
   Power going to wave formation at top speed: 48 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
      - Forward deck:   30.00 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
      - Aft deck:   35.00 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
      - Quarter deck:   15.00 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
      - Average freeboard:      26.25 ft / 8.00 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 40.5 %
      - Above water (accommodation/working, high = better): 180.4 %
   Waterplane Area: 14,543 Square feet or 1,351 Square metres
   Displacement factor (Displacement / loading): 209 %
   Structure weight / hull surface area: 87 lbs/sq ft or 425 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 7.89
      - Overall: 1.22
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Misc Weights
800t on deck: handling equippage, cranes, etc for 20x20t MTBs
500t hull above water: bunks for 250 sailors (crews of MTBs)
500t hull above water: store rooms and workshops for 5,000t military shipping
25t above deck: long range radio
10t above deck: 2 short range radios
50t on deck: flagship
25t above deck: flagship

[TacCovert4]

I would want to denote fuel for the mtbs.  And I'd want that fuel below waterline because its super flammable.

[The Rock Doctor]

Now i guess the question is whether there's enough deck space fir its flock..

[Darman]

Both of you make good points: I should have specified that some of the extra storage for replenishment and basic maintenance is below the waterline. However, I was also wondering whether fuel assigned to the ship could be assumed to be fuel for vessels its supporting (but not add to any tonnage supported, i.e. the ship has 10,000nm range, I was considering bumping that up to 15,000 to simulate the extra fuel for MTBs and other ships. But since I'm allocating only 500t to replenishment then it can only support 5,000t shipping.

As far as deck space goes.... I was wondering about that. Maybe if there was a hold below deck level that could be used to stack MTBs? Maybe for every 1 MTB lowered onto a sort of hangar deck below the main deck there are 2 MTBs on deck? It's not really intended to be an MTB carrier in terms of it transporting its cargo and deploying them into battle. It requires carrying capacity to bring MTBs out to colonies and provide logistics support out there

[The Rock Doctor]

I don't think a "hanger" is impossible but even a 20 t MTB is substantially longer and heavier than a WW2 torpedo-bomber, and without the benefit of wheels or folding wings.

As a tender, I think the design is fine.  As something intended to physically embark a large number of MTBs, I have doubts it can work. 

[The Rock Doctor]

To add on that - my own philosophy is that I'd rely on civilian freighters to haul MTBs between theatres, bringing four or six at a time as deck cargo.  If I were to build a ship for that task, it'd have deck space, a big crane, and some weight to accommodate the cargo - but no fuel, ammunition, or crew accommodation.

[Kaiser Kirk]

However, I was also wondering whether fuel assigned to the ship could be assumed to be fuel for vessels its supporting (but not add to any tonnage supported, i.e. the ship has 10,000nm range, I was considering bumping that up to 15,000 to simulate the extra fuel for MTBs and other ships.

As far as deck space goes.... I was wondering about that. Maybe if there was a hold below deck level that could be used to stack MTBs? Maybe for every 1 MTB lowered onto a sort of hangar deck below the main deck there are 2 MTBs on deck? It's not really intended to be an MTB carrier in terms of it transporting its cargo and deploying them into battle. It requires carrying capacity to bring MTBs out to colonies and provide logistics support out there

A) Currently there is no provision for ship fuel to be used to refuel other vessels, including those carried.  The exception being the ship's regular complement.
B) MTBs almost certainly have lightweight, hi-reving gasoline engines adapted from aviation (or adapted for aviation).  Ships bunker fuel would not be useful.

C) Deck space/usability issues : On the one hand 'if springsharp allows it', on the other hand if it's ever to be used then the other player or the war moderator will have to buy off that it's a functional/practical matter, particularly in terms of miscellaneous weight.  So coming up with a plausible way of allocating the deck cargo is useful.

D) MTB A's are @20m x ~3.5m...I figured it out a couple times, but keep forgetting.    I dunno what MTB Bs are, but probably ~18m x 2.5 x 1.5m, 0.38bc.
That's a lot of deckspace, and that's in addition to everything else you normally have up there.

E) It is presumed that civilian or even naval auxiliaries exist and perform the 'chores' of the fleet, which would include schlepping MTBs around.

[Darman]

A) Currently there is no provision for ship fuel to be used to refuel other vessels, including those carried.

I meant more from a role-play perspective, I had no wish to infringe upon nor bend any rules to get some extra capabilities.  Tac had merely pointed out that fuel ought to be more protected and not kept in the hull above the waterline as I had specified for "store rooms and workshops", saying nothing of fuel storage.   

B) MTBs almost certainly have lightweight, hi-reving gasoline engines adapted from aviation (or adapted for aviation).  Ships bunker fuel would not be useful.

I figured as much.  Which is why, in my head, i didn't figure on the exact fuel being resupplied... in mind if there was separated bunkerage for 10,000nm worth of fuel it would be in different compartments and what difference would it be if a separate compartment was used for MTB fuel versus heavier ship fuels? Even though it could hold either fuel.  My reasoning may be flawed. 

C) Deck space/usability issues : On the one hand 'if springsharp allows it', on the other hand if it's ever to be used then the other player or the war moderator will have to buy off that it's a functional/practical matter, particularly in terms of miscellaneous weight.  So coming up with a plausible way of allocating the deck cargo is useful.
D) MTB A's are @20m x ~3.5m...I figured it out a couple times, but keep forgetting.    I dunno what MTB Bs are, but probably ~18m x 2.5 x 1.5m, 0.38bc.
That's a lot of deckspace, and that's in addition to everything else you normally have up there.

This is what most concerned me.  I was actually researching early British coastal MTBs to try and discern possible dimensions (only lengths were available on Wikipedia, though my searching didn't delve too deep).  Part of the reason I had mentioned a sort of "hold".  Where I lived for the past 8 years, we had large vessels come in seasonally, these vessels are essentially mobile floating drydocks, they flood themselves partially to allow yachts and the like to come aboard and then seal themselves off and dry out their holds.  I have no wish to simulate that, what I have in mind is more of an aircraft carrier hangar deck with an elevator in the center that will raise each craft to main deck level one by one.  [/quote]

E) It is presumed that civilian or even naval auxiliaries exist and perform the 'chores' of the fleet, which would include schlepping MTBs around.

I know, but I also feel like it could be advantageous to have specified auxiliary vessels that are capable of doing the same

[Darman]

I'm not concerned about the cost, necessarily, but I'm looking at my Numanica-class battleships and I've got 190t "construction reserve".  I'm considering giving the 3 ships of that class an overhaul and refitting them with 130t of 1905 Fire Control.   I'll have to pay the amount for the Fire Control equipment.  If I wanted to update the secondary and tertiary armament to QF (its a legacy design that has those batteries as BL) I'd have to pay the cost for those as well, correct?