WesWorld

Summary
The Danube Riverine Flotilla will serve under joint Army and Navy commands to patrol the Danube River.

Bases
- Western Danube Command based in Vidin, Bulgaria.
- Eastern Danube Command based in Ruse/Rousse, Bulgaria.

River Monitor/Rechen Monitor
- RM-1 Krum
- RM-2 Boris
- RM-3 Kubrat
- RM-4 Omurtag
- RM-5 Knyaz Alexander

Patrol Gunboats/Patrul Kanonerska Lodka
- PKL-1 Kliment Turnovski
- PKL-2 Petko Karavelov
- PKL-3 Stefan Stambolov
- PKL-4 Johan Ehrnrooth
- PKL-5 Konstantin Stoilov

Rechen Torpedna Lodka
- RTL1 through RTL80 - 80 boats

[SIZE=3]Krum-class, German-designed Bulgarian River Monitor laid down 1936[/SIZE]

Displacement:
401 t light; 440 t standard; 450 t normal; 458 t full load

Dimensions: Length overall / water x beam x draught
198.59 ft / 196.85 ft x 26.25 ft x 4.92 ft (normal load)
60.53 m / 60.00 m x 8.00 m x 1.50 m

Armament:
2 - 5.91" / 150 mm guns in single mounts, 102.98lbs / 46.71kg shells, 1936 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
4 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1936 Model
Quick firing guns in deck mounts
on side, all amidships
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 303 lbs / 138 kg
Shells per gun, main battery: 160

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.97" / 50 mm 117.13 ft / 35.70 m 6.14 ft / 1.87 m
Ends: Unarmoured
Main Belt covers 92 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.15" / 80 mm 1.57" / 40 mm -
2nd: 1.57" / 40 mm 0.79" / 20 mm -
3rd: 0.79" / 20 mm - -
4th: 0.39" / 10 mm - -

- Armour deck: 0.39" / 10 mm, Conning tower: 3.94" / 100 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,362 shp / 1,016 Kw = 16.00 kts
Range 1,000nm at 10.00 kts
Bunker at max displacement = 18 tons

Complement:
48 - 63

Cost:
£0.267 million / $1.070 million

Distribution of weights at normal displacement:
Armament: 38 tons, 8.4 %
Armour: 128 tons, 28.3 %
- Belts: 62 tons, 13.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 33 tons, 7.2 %
- Armour Deck: 28 tons, 6.2 %
- Conning Tower: 5 tons, 1.1 %
Machinery: 34 tons, 7.6 %
Hull, fittings & equipment: 201 tons, 44.7 %
Fuel, ammunition & stores: 49 tons, 10.9 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
779 lbs / 354 Kg = 7.6 x 5.9 " / 150 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.46
Metacentric height 1.3 ft / 0.4 m
Roll period: 9.7 seconds
Steadiness - As gun platform (Average = 50 %): 54 %
- Recoil effect (Restricted arc if above 1.00): 0.32
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.620
Length to Beam Ratio: 7.50 : 1
'Natural speed' for length: 14.03 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 53
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 9.84 ft / 3.00 m
- Forecastle (20 %): 6.56 ft / 2.00 m
- Mid (50 %): 6.56 ft / 2.00 m
- Quarterdeck (15 %): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 6.82 ft / 2.08 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 91.0 %
- Above water (accommodation/working, high = better): 100.2 %
Waterplane Area: 3,850 Square feet or 358 Square metres
Displacement factor (Displacement / loading): 89 %
Structure weight / hull surface area: 40 lbs/sq ft or 193 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.35
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate

Ships in Class
- RM-1 Krum - 1936
- RM-2 Boris - 1936
- RM-3 Kubrat- 1937
- RM-4 Omurtag- 1937
- RM-5 Knyaz Alexander - 1937

[SIZE=3]Kliment Turnovski-class, German-Designed Bulgarian River Patrol Boat (Patrul Kanonerska Lodka) laid down 1936[/SIZE]

Displacement:
188 t light; 201 t standard; 207 t normal; 212 t full load

Dimensions: Length overall / water x beam x draught
133.40 ft / 131.23 ft x 19.69 ft x 4.92 ft (normal load)
40.66 m / 40.00 m x 6.00 m x 1.50 m

Armament:
2 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1936 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1936 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 50 lbs / 23 kg
Shells per gun, main battery: 290

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm -
2nd: 0.79" / 20 mm - -
3rd: 0.39" / 10 mm - -

- Conning tower: 1.97" / 50 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2,545 shp / 1,898 Kw = 20.00 kts
Range 1,000nm at 10.00 kts
Bunker at max displacement = 11 tons

Complement:
26 - 35

Cost:
£0.115 million / $0.460 million

Distribution of weights at normal displacement:
Armament: 6 tons, 3.0 %
Armour: 7 tons, 3.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 2.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.7 %
Machinery: 71 tons, 34.5 %
Hull, fittings & equipment: 103 tons, 49.7 %
Fuel, ammunition & stores: 19 tons, 9.3 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
201 lbs / 91 Kg = 9.7 x 3.5 " / 88 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 49 %
- Recoil effect (Restricted arc if above 1.00): 0.30
Seaboat quality (Average = 1.00): 0.92

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.570
Length to Beam Ratio: 6.67 : 1
'Natural speed' for length: 11.46 kts
Power going to wave formation at top speed: 74 %
Trim (Max stability = 0, Max steadiness = 100): 53
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 12.30 ft / 3.75 m
- Forecastle (20 %): 11.48 ft / 3.50 m
- Mid (50 %): 11.48 ft / 3.50 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 9.91 ft / 3.02 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 137.3 %
- Above water (accommodation/working, high = better): 130.8 %
Waterplane Area: 1,837 Square feet or 171 Square metres
Displacement factor (Displacement / loading): 104 %
Structure weight / hull surface area: 28 lbs/sq ft or 135 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.78
- Longitudinal: 9.70
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Ships in Class
- PKL-1 Kliment Turnovski- 1936
- PKL-2 Petko Karavelov- 1936
- PKL-3 Stefan Stambolov- 1937
- PKL-4 Johan Ehrnrooth - 1937
- PKL-5 Konstantin Stoilov - 1937

[SIZE=3]RGB 12-ton River Gun/Torpedo Boat[/SIZE]

Dimensions:
- Length (w/l): 55 feet
- Beam: 11 feet
- Draft: 4
Displacement: 12 tons
Armament:
- 1x20mm Oerlikon
- 2x18"TT or 1x81mm mortar
- 2 D.C.
Machinery: 2x 600 hp petrol engines (PPTAS-12V)
Speed: 41 knots
Cruising radius: 300 nm
Crew: 3 (Commander/driver, gunner, engine/torpedoman

These 55-foot, 12 ton, 3-man boats carry a single Oerlikon 20mm gun and two 18" torpedoes in stern slips. The torpedoes can be removed and a plate fastened in place permitting the mounting of a Brandt mle 27/31 81mm mortar, with three additional crewmen. Two 50kg depth small charges can also be strapped to the side of the cockpit. For additional firepower, submachine guns, rifles, and pistols may be carried by the crew. The 18" torpedoes are launched through stern-mounted torpedo slips, and thus the boat must be moving faster than the torpedoes when it fires them. These boats are modeled somewhat off the Thornycroft coastal MTBs, and are intended for service as patrol and police craft on the Danube.

The PPTAS-12V petrol engine is manufactured by Plovdiv Pozharnikar Tovaren Avtomobil Stroitel (translated "Plovdiv Firefighter Lorry Builder"), which is Bulgaria's chief manufacturer of firetrucks. The boats themselves are assembled by the Burgas Yahta Korabostroitelnitsa (Burgas Yacht Shipyard) facilities in Burgas.