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[radko1111]

U-Boat VIIB

The VIIA had limited fuel capacity, so 24 Type VIIB boats were built between 1936 and 1940 with an additional 33 tons of fuel in external saddle tanks which added another 2500 miles (4625 km) of range at 10 knots (19 km/h) surfaced.[25] They were slightly faster than the VIIA, and had two rudders for greater agility. The torpedo armament was improved by moving the aft tube to the inside of the boat. Now an additional aft torpedo could be carried below the deck plating of the aft torpedo room (which also served as the electric motor room) and two watertight compartments under the upper deck could hold two additional torpedoes giving it a total of 14 torpedoes. The only exception was U-83, which lacked a stern tube and carried only 12 torpedoes.[25]
Type VIIBs included many of the most famous U-boats of World War II, including U-48 (the most successful), Prien's U-47, Kretschmer's U-99, and Schepke's U-100.[25]
On the surface the boat was powered by two supercharged MAN, 6 cylinder, 4-stroke M6V 40/46 diesels (except for U-45 to U-50, U-83, U-85, U-87, U-99, U-100, and U-102 which were powered by two supercharged Germaniawerft 6-cylinder, 4-stroke F46 diesels) giving a total of 2,800 to 3,200 bhp (2,400 kW) at 470 to 490 rpm. When submerged, the boat was powered by two AEG GU 460/8-276 (except in U-45, U-46, U-49, U-51, U-52, U-54, U-73 to U-76, U-99 and U-100 which retained the BBC motor of the VIIA) electric motors giving a total of 750 shp (560 kW) at 295 rpm.[25]

Displacement
surfaced      753 tons   
Displacement
submerged      857 tons   
Length
overall      66.6 m   
Length
pressure hull   48.8 m   
Beam
overall      6.2 m   
Beam
pressure hull   4.7 m   
Draft                4.74 m   
Power
surfaced      2,400 kW   
Power
submerged      560 kW
Surface
speed   17.9 knots (33.2 km/h)   
Submerged
speed   8 knots
Surface
range      16,095 km (8,691 nmi)   
Submerged
range      175 km (94 nmi)   
Maximum
operating depth      220 m   
Crush depth           230–250 m   
Complement      44–48   



http://ww2total.com/WW2/Weapons/Warships/Submarines/German/U-boats/Type-7C-U-boats.htm

I-15

I15 submarine class (20 submarines)
Type: Japanese submarine class, launched 1939-1942
History: These Japanese submarines, designated Type B, were scouting craft designed to work in conjunction with the Type A headquarters submarines. They were developed from the Type KD6 and construction was carried out parallel with that of the Type A and Type C
submarine.
For scouting the I15 Class submarines carried a single floatplane stowed in sections in a small circular hangar extending forward of the conning tower. On the deck casing forward of the hangar there was a catapult reaching almost to the bows.
In order to simplify design and construction and to speed delivery of the boats, as many aspects of the design equipment as
possible were made common to all three
types. Machinery was thus identical to the
Type A I9 Class, though bunkerage was reduced and the radius of action was thus 2000 nautical miles less. Armament was the same as in I9 Class, except that only 17 torpedoes were carried.

Initially only six submarines (I15 - I25) were ordered to this design under the 1937 Programme, but under the 1939 Programme a further 14 vessels were ordered. The boats entered service between September 1940 and April 1943 having been built at Kure navy
yard (I15, I26, I30, I37), Yokosuka navy yard (I17, I23, I29, I31, I36), Mitsubishi­ Kobe (I19, I25, I28, I33, I35), Kawasaki­Kobe (I21) and Sasebo navy yard (I27, I32, I34, I38, I39).
During the war a number of units had a 140-mm (5.5-in) gun added in front of the conning tower to enable the boats to act as attack submarines. Towards the end of 1944 I36 and I37 were modified to carry four Kaiten suicide submarines.
http://ww2total.com/WW2/Weapons/Warships/Submarines/Japanese/I15/Japanese-submarines-I15-class.htm

Class and type:            Type B1 submarine
Displacement:            2,584 tons surfaced
                                         3,654 tons submerged
Length:                    356.5 ft (108.7 m)
Beam:                    30.5 ft (9.3 m)
Draft:                    16.8 ft (5.1 m)
Propulsion:             2 diesels: 12,400 hp (9,200 kW)
Electric motors:           2,000 hp (1,500 kW)
Speed:                    23.5 knots (43.5 km/h) surfaced
                                         8 knots (15 km/h) submerged
Range:                    14,000 nautical miles (26,000 km) at 16 knots (30 km/h)
Test depth:            100 m (330 ft)
Complement:            94
Armament:   
                                          6 × 533 mm forward torpedo tubes
                                          17 torpedoes
                                           1 × 140 mm 50 calibre gun
                                          Aircraft carried:   1 Yokosuka E14Y seaplane
                                         
                                         


http://silentseawolvesmsw.devhub.com/blog/659111-ijn-submarine-floatplanes/

[HundertzehnGustav]

i dont understand... in the game it says there is a VII c, why want a VIIb, and ships do not care about fuel, torpedoes or such?
except the tower, it is the same thing... and that could very well be a VIIb with a retrofitted tower upgrade in mid 1943..
really confuses me.

[SAS~Bombsaway]

I would love to have the I-15 and the float plane with it. Also it would be cool if we couldtake off from the I-15 like a carrier.

[RGA]

i dont understand... in the game it says there is a VII c, why want a VIIb, and ships do not care about fuel, torpedoes or such?
except the tower, it is the same thing... and that could very well be a VIIb with a retrofitted tower upgrade in mid 1943..
really confuses me.

The Type VIIC version we have ingame is called the U-flak, basically a floating AA battery. Most Type VII didn't have that impressive air defense, even the good old Stringbag could scare the shoot out of them. IMHO, a new Type VIIB with downgraded AA is in order.

[radko1111]

i dont understand... in the game it says there is a VII c, why want a VIIb, and ships do not care about fuel, torpedoes or such?
except the tower, it is the same thing... and that could very well be a VIIb with a retrofitted tower upgrade in mid 1943..
really confuses me.

for the year 1940 is heavily equipped VIIc

[radko1111]

i dont understand... in the game it says there is a VII c, why want a VIIb, and ships do not care about fuel, torpedoes or such?
except the tower, it is the same thing... and that could very well be a VIIb with a retrofitted tower upgrade in mid 1943..
really confuses me.

The Type VIIC version we have ingame is called the U-flak, basically a floating AA battery. Most Type VII didn't have that impressive air defense, even the good old Stringbag could scare the shoot out of them. IMHO, a new Type VIIB with downgraded AA is in order.

+111111 great truth

[HundertzehnGustav]

i dont understand... in the game it says there is a VII c, why want a VIIb, and ships do not care about fuel, torpedoes or such?
except the tower, it is the same thing... and that could very well be a VIIb with a retrofitted tower upgrade in mid 1943..
really confuses me.

The Type VIIC version we have ingame is called the U-flak, basically a floating AA battery. Most Type VII didn't have that impressive air defense, even the good old Stringbag could scare the shoot out of them. IMHO, a new Type VIIB with downgraded AA is in order.

nono... u Flaks diddnt have a Cannon up front but an extra AAA quad up front, or some sort of 37mm single or twin mount.
The VIIc we have is indeed a late war ( in submarine warfare 1943 was late...) VIIc with 2x2 Cannons of 20mm calibre and a 37mm

and since the game does not care about scaring... AI very limited...

a basic VII a/b/c would be nice to have though, above all with the early towers

[asheshouse]

U-Boats VII-B, VII-C(1942), IX-B and IX-C are in progress by others.

I have basic drawings of the Royal Navy S, T and U Classes, the major classes of WWII.
No intentions to do anything with them at present though.
U Class would be useful for Med scenarios.

[HundertzehnGustav]

they are indeed?
an IX-c would be...
oh... phew!


my favorite atlantic cruiser...

[congo]

Actually the M6A1 was carried on the I-400 class subs. This class sub used one of the most powerful catapults developed during WWII.

http://en.wikipedia.org/wiki/I-400_class_submarine

[radko1111]

[RedSpade]

The I-400 class subs were the crucial element in a plan for an attack on the Panama Canal by the IJN to damage/destroy the locks.  You may have heard me harping on (endlessly  ) about having a Panama map, because I'd like to create/have a mission that simulates that possibility.  Until today, I've only envisioned the flying/bombing aspect to a mission like that.  Now maybe my vision can be expanded by the creation of an I-400 class submarine. 

This hobby creates a lot of work!    Thanks for the inspiration!