WesWorld

Greetings!

After some problems with the whole design and a particular problem with the concept, I have the honor of publishing the Trumpet Class. The idea was to make it fast enough to follow the cruising speed of the main fleet, but no more. I'm still not completely sure of that decision. That speed could make the boat too problematic and too easy to catch. I would like to hear your opinions about that and about the ship in general.



Trumpet Class, monitor laid down 1927


Displacement:
8.378 t light; 8.877 t standard; 9.292 t normal; 9.624 t full load


Dimensions: Length overall / water x beam x draught
484,61 ft / 459,32 ft x 75,46 ft x 17,06 ft (normal load)
147,71 m / 140,00 m x 23,00 m x 5,20 m


Armament:
2 - 15,00" / 381 mm guns (1x2 guns), 1.687,50lbs / 765,44kg shells, 1927 Model
Breech loading guns in a turret (on a barbette)
on centreline forward
8 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1927 Model
Quick firing guns in deck mounts
on side, evenly spread
8 - 1,50" / 38,1 mm guns (4x2 guns), 1,69lbs / 0,77kg shells, 1927 Model
Breech loading guns in deck mounts
on side ends, evenly spread
4 - 1,50" / 38,1 mm guns in single mounts, 1,69lbs / 0,77kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
24 - 0,99" / 25,1 mm guns (6x4 guns), 0,49lbs / 0,22kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 3.663 lbs / 1.661 kg
Shells per gun, main battery: 150


Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 7,87" / 200 mm 206,69 ft / 63,00 m 11,29 ft / 3,44 m
Ends: Unarmoured
Main Belt covers 69 % of normal length


- Torpedo Bulkhead:
3,54" / 90 mm 262,47 ft / 80,00 m 13,55 ft / 4,13 m


- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 9,84" / 250 mm 3,15" / 80 mm 7,87" / 200 mm
3rd: 1,18" / 30 mm - -
5th: 1,18" / 30 mm - -


- Armour deck: 3,94" / 100 mm, Conning tower: 4,72" / 120 mm


Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 10.316 shp / 7.696 Kw = 18,00 kts
Range 5.000nm at 12,00 kts
Bunker at max displacement = 747 tons


Complement:
473 - 615


Cost:
£2,631 million / $10,523 million


Distribution of weights at normal displacement:
Armament: 458 tons, 4,9 %
Armour: 3.498 tons, 37,6 %
- Belts: 887 tons, 9,5 %
- Torpedo bulkhead: 466 tons, 5,0 %
- Armament: 338 tons, 3,6 %
- Armour Deck: 1.762 tons, 19,0 %
- Conning Tower: 45 tons, 0,5 %
Machinery: 326 tons, 3,5 %
Hull, fittings & equipment: 4.077 tons, 43,9 %
Fuel, ammunition & stores: 914 tons, 9,8 %
Miscellaneous weights: 20 tons, 0,2 %


Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
22.599 lbs / 10.251 Kg = 13,4 x 15,0 " / 381 mm shells or 5,7 torpedoes
Stability (Unstable if below 1.00): 1,32
Metacentric height 5,4 ft / 1,6 m
Roll period: 13,7 seconds
Steadiness - As gun platform (Average = 50 %): 79 %
- Recoil effect (Restricted arc if above 1.00): 0,36
Seaboat quality (Average = 1.00): 1,57


Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,550
Length to Beam Ratio: 6,09 : 1
'Natural speed' for length: 21,43 kts
Power going to wave formation at top speed: 39 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 20,00 degrees
Stern overhang: 16,40 ft / 5,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,41 ft / 7,44 m
- Forecastle (20 %): 15,52 ft / 4,73 m
- Mid (50 %): 15,52 ft / 4,73 m
- Quarterdeck (15 %): 15,52 ft / 4,73 m
- Stern: 15,52 ft / 4,73 m
- Average freeboard: 16,23 ft / 4,95 m


Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 68,9 %
- Above water (accommodation/working, high = better): 151,2 %
Waterplane Area: 24.189 Square feet or 2.247 Square metres
Displacement factor (Displacement / loading): 119 %
Structure weight / hull surface area: 128 lbs/sq ft or 624 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,93
- Longitudinal: 1,79
- Overall: 1,00
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

Well, as you yourself elude to, the speed is high for a monitor type vessel and I would think slow for a coastal defense battleship (also lacks sufficient main guns to be classed as a coastal defense battleship), 10-15 knots would seem adequate. One thing you might also try is to add some purposely exaggerated bulges to give them greater torpedo protection, these however would reduce the speed of the vessel.

Sounds good. After play with that idea for a while I discovered how usefull it is, thanks you. It gave me a the posibility to increse the armor, espesially the deck armor. Also I put it bigger guns (16 inches) and I didn't had to reduce the speed to much.
So, here is the result:


Trumpet Class, monitor laid down 1927

Displacement:
11.000 t light; 11.615 t standard; 12.120 t normal; 12.524 t full load

Dimensions: Length overall / water x beam x draught
459,32 ft / 459,32 ft x 75,46 ft (Bulges 98,43 ft) x 17,06 ft (normal load)
140,00 m / 140,00 m x 23,00 m (Bulges 30,00 m) x 5,20 m

Armament:
2 - 16,00" / 406 mm guns (1x2 guns), 2.048,00lbs / 928,96kg shells, 1927 Model
Breech loading guns in a turret (on a barbette)
on centreline forward
8 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1927 Model
Quick firing guns in deck mounts
on side, evenly spread
8 - 1,50" / 38,1 mm guns (4x2 guns), 1,69lbs / 0,77kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
4 - 1,50" / 38,1 mm guns in single mounts, 1,69lbs / 0,77kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
24 - 0,99" / 25,1 mm guns (6x4 guns), 0,49lbs / 0,22kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 4.384 lbs / 1.989 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 13,8" / 350 mm 183,73 ft / 56,00 m 10,43 ft / 3,18 m
Ends: Unarmoured
Main Belt covers 62 % of normal length

- Torpedo Bulkhead and Bulges:
3,94" / 100 mm 298,56 ft / 91,00 m 15,65 ft / 4,77 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11,8" / 300 mm 3,94" / 100 mm 11,8" / 300 mm
2nd: 1,18" / 30 mm - -
3rd: 1,18" / 30 mm - -
4th: 1,18" / 30 mm - -
5th: 1,18" / 30 mm - -

- Armour deck: 5,91" / 150 mm, Conning tower: 4,72" / 120 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 10.255 shp / 7.650 Kw = 17,00 kts
Range 5.000nm at 12,00 kts
Bunker at max displacement = 909 tons

Complement:
576 - 750

Cost:
£3,239 million / $12,954 million

Distribution of weights at normal displacement:
Armament: 548 tons, 4,5 %
Armour: 5.209 tons, 43,0 %
- Belts: 1.322 tons, 10,9 %
- Torpedo bulkhead: 681 tons, 5,6 %
- Armament: 511 tons, 4,2 %
- Armour Deck: 2.643 tons, 21,8 %
- Conning Tower: 54 tons, 0,4 %
Machinery: 324 tons, 2,7 %
Hull, fittings & equipment: 4.919 tons, 40,6 %
Fuel, ammunition & stores: 1.120 tons, 9,2 %
Miscellaneous weights: 0 tons, 0,0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
31.067 lbs / 14.092 Kg = 15,2 x 16,0 " / 406 mm shells or 9,8 torpedoes
Stability (Unstable if below 1.00): 1,53
Metacentric height 6,7 ft / 2,1 m
Roll period: 15,9 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0,14
Seaboat quality (Average = 1.00): 1,42

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,550
Length to Beam Ratio: 4,67 : 1
'Natural speed' for length: 21,43 kts
Power going to wave formation at top speed: 39 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 23,59 ft / 7,19 m
- Forecastle (20 %): 14,99 ft / 4,57 m
- Mid (50 %): 14,99 ft / 4,57 m
- Quarterdeck (15 %): 14,99 ft / 4,57 m
- Stern: 14,99 ft / 4,57 m
- Average freeboard: 15,68 ft / 4,78 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 60,8 %
- Above water (accommodation/working, high = better): 119,9 %
Waterplane Area: 24.189 Square feet or 2.247 Square metres
Displacement factor (Displacement / loading): 118 %
Structure weight / hull surface area: 143 lbs/sq ft or 701 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,95
- Longitudinal: 1,62
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Also worth trying, any old battleships scrapping can have their guns repurposed for this sort of ship, (9.5", 10", 12") and would make the cost of such units cheaper (though springsharp doesn't recognize the usage of used guns).

Okay, I may be exaggerated with the 16 inches guns. I like the idea of re-use an old gun, I should have thinked about it before.



Trumpet Class, Monitor laid down 1927

Displacement:
11.060 t light; 11.615 t standard; 12.120 t normal; 12.524 t full load

Dimensions: Length overall / water x beam x draught
486,72 ft / 459,32 ft x 75,46 ft (Bulges 98,43 ft) x 17,06 ft (normal load)
148,35 m / 140,00 m x 23,00 m (Bulges 30,00 m) x 5,20 m

Armament:
2 - 15,00" / 381 mm guns (1x2 guns), 1.687,50lbs / 765,44kg shells, 1916 Model
Breech loading guns in a turret (on a barbette)
on centreline forward
8 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1927 Model
Quick firing guns in deck mounts
on side, evenly spread
8 - 1,50" / 38,1 mm guns (4x2 guns), 1,69lbs / 0,77kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
4 - 1,50" / 38,1 mm guns in single mounts, 1,69lbs / 0,77kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
24 - 0,99" / 25,1 mm guns (6x4 guns), 0,49lbs / 0,22kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 3.663 lbs / 1.662 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 15,7" / 400 mm 168,96 ft / 51,50 m 10,43 ft / 3,18 m
Ends: Unarmoured
Main Belt covers 57 % of normal length

- Torpedo Bulkhead and Bulges:
4,33" / 110 mm 298,56 ft / 91,00 m 15,65 ft / 4,77 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 13,8" / 350 mm 3,94" / 100 mm 11,8" / 300 mm
2nd: 1,18" / 30 mm - -
3rd: 1,18" / 30 mm - -
4th: 1,18" / 30 mm - -
5th: 1,18" / 30 mm - -

- Armour deck: 6,30" / 160 mm, Conning tower: 4,72" / 120 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 12.670 shp / 9.452 Kw = 18,00 kts
Range 5.000nm at 12,00 kts
Bunker at max displacement = 909 tons

Complement:
576 - 750

Cost:
£3,010 million / $12,039 million

Distribution of weights at normal displacement:
Armament: 458 tons, 3,8 %
Armour: 5.538 tons, 45,7 %
- Belts: 1.427 tons, 11,8 %
- Torpedo bulkhead: 749 tons, 6,2 %
- Armament: 490 tons, 4,0 %
- Armour Deck: 2.819 tons, 23,3 %
- Conning Tower: 54 tons, 0,4 %
Machinery: 400 tons, 3,3 %
Hull, fittings & equipment: 4.634 tons, 38,2 %
Fuel, ammunition & stores: 1.060 tons, 8,7 %
Miscellaneous weights: 30 tons, 0,2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
33.701 lbs / 15.287 Kg = 20,0 x 15,0 " / 381 mm shells or 11,2 torpedoes
Stability (Unstable if below 1.00): 1,55
Metacentric height 6,9 ft / 2,1 m
Roll period: 15,8 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0,12
Seaboat quality (Average = 1.00): 1,45

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,550
Length to Beam Ratio: 4,67 : 1
'Natural speed' for length: 21,43 kts
Power going to wave formation at top speed: 42 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 25,00 degrees
Stern overhang: 16,40 ft / 5,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23,59 ft / 7,19 m
- Forecastle (20 %): 14,99 ft / 4,57 m
- Mid (50 %): 14,99 ft / 4,57 m
- Quarterdeck (15 %): 14,99 ft / 4,57 m
- Stern: 14,99 ft / 4,57 m
- Average freeboard: 15,68 ft / 4,78 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 56,3 %
- Above water (accommodation/working, high = better): 119,9 %
Waterplane Area: 24.189 Square feet or 2.247 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 135 lbs/sq ft or 660 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,95
- Longitudinal: 1,55
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

One last critique, your 38mm guns can be laid out in one slot as they are all side distributed. This could leave a slot open for small arms (50-45 cal.) to use against small boats such as motor torpedo boats that the larger guns would be overkill against.

That is a good idea. Even when is fun kill a fly with a nuke.



Trumpet Class, monitor laid down 1927

Displacement:
11.060 t light; 11.615 t standard; 12.120 t normal; 12.524 t full load

Dimensions: Length overall / water x beam x draught
484,31 ft / 459,32 ft x 75,46 ft (Bulges 98,43 ft) x 17,06 ft (normal load)
147,62 m / 140,00 m x 23,00 m (Bulges 30,00 m) x 5,20 m

Armament:
2 - 15,00" / 381 mm guns (1x2 guns), 1.687,50lbs / 765,44kg shells, 1916 Model
Breech loading guns in a turret (on a barbette)
on centreline forward
8 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1927 Model
Quick firing guns in deck mounts
on side, evenly spread
12 - 1,50" / 38,1 mm guns (8 mounts), 1,69lbs / 0,77kg shells, 1927 Model
Breech loading guns in deck mounts
on side ends, evenly spread, 4 raised mounts - superfiring
14 - 0,50" / 12,7 mm guns in single mounts, 0,06lbs / 0,03kg shells, 1919 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
24 - 0,99" / 25,1 mm guns (6x4 guns), 0,49lbs / 0,22kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 3.664 lbs / 1.662 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 15,7" / 400 mm 168,96 ft / 51,50 m 10,43 ft / 3,18 m
Ends: Unarmoured
Main Belt covers 57 % of normal length

- Torpedo Bulkhead and Bulges:
4,33" / 110 mm 298,56 ft / 91,00 m 15,65 ft / 4,77 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 13,8" / 350 mm 3,94" / 100 mm 11,8" / 300 mm
2nd: 1,18" / 30 mm - -
3rd: 1,18" / 30 mm - -
4th: 1,18" / 30 mm - -
5th: 1,18" / 30 mm - -

- Armour deck: 6,30" / 160 mm, Conning tower: 4,72" / 120 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 12.670 shp / 9.452 Kw = 18,00 kts
Range 5.000nm at 12,00 kts
Bunker at max displacement = 909 tons

Complement:
576 - 750

Cost:
£3,010 million / $12,040 million

Distribution of weights at normal displacement:
Armament: 458 tons, 3,8 %
Armour: 5.545 tons, 45,8 %
- Belts: 1.427 tons, 11,8 %
- Torpedo bulkhead: 749 tons, 6,2 %
- Armament: 497 tons, 4,1 %
- Armour Deck: 2.819 tons, 23,3 %
- Conning Tower: 54 tons, 0,4 %
Machinery: 400 tons, 3,3 %
Hull, fittings & equipment: 4.636 tons, 38,3 %
Fuel, ammunition & stores: 1.060 tons, 8,7 %
Miscellaneous weights: 20 tons, 0,2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
33.817 lbs / 15.339 Kg = 20,0 x 15,0 " / 381 mm shells or 11,2 torpedoes
Stability (Unstable if below 1.00): 1,55
Metacentric height 6,9 ft / 2,1 m
Roll period: 15,7 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0,12
Seaboat quality (Average = 1.00): 1,45

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,550
Length to Beam Ratio: 4,67 : 1
'Natural speed' for length: 21,43 kts
Power going to wave formation at top speed: 42 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 20,00 degrees
Stern overhang: 16,40 ft / 5,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23,59 ft / 7,19 m
- Forecastle (20 %): 14,99 ft / 4,57 m
- Mid (50 %): 14,99 ft / 4,57 m
- Quarterdeck (15 %): 14,99 ft / 4,57 m
- Stern: 14,99 ft / 4,57 m
- Average freeboard: 15,68 ft / 4,78 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 56,2 %
- Above water (accommodation/working, high = better): 119,9 %
Waterplane Area: 24.189 Square feet or 2.247 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 135 lbs/sq ft or 660 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,95
- Longitudinal: 1,55
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Take in count that the four rised 1.5 inches guns are in sigle mounts and on the center of the ship.