- Yes, for tree
- Yes, for premium
- Yes, for event / gift
- No
Ōhama class Target Ship / 大浜型標的艦
Bow of Ōsashi, 1946
She sank due to collision with Yamashio-Maru. Her mooring line was cut by a mine and she was drifting in the Yokohama port.
Full photo
Aircraft carrier on center of photo is army’s escort aircraft carrier Yamashio-Maru.
Briefly: A TRUE BOMBING TARGET!!!
More seriously: excellent speed escort ship with lots of AA gun!
Classification
- 特務艦 (Special Service Ship)
- 標的艦 (Target Ship)
- 大浜型 (Ōhama class)
- Design Number: J36
History
Ōhama class target ship is a bombing target ship of Imperial Japanese Navy completed 1945.
In 1941, IJN planned a high-speed target ship for bombing training. In that time IJN had training ship Settsu (摂津, retired battleship) but speed was only 17.4 knots. In 1943, Hamakatsu (浜勝) was completed but its speed was only 19.3 knots. It was not enough and there are problem of stability.
To solve these issues, They planed Ōhama class in 1943.
Name ship, Ōhama was laid down in October 2, 1943, launched March 29, 1944 and completed in January 10, 1945 at MHI Yokohama dock.
In August 9, she entered Megawa port, Miyagi pref and sunk due to air raid.
Also, sister ship Ōsashi was launched in February 26, 1945 but construction was cancelled in June 23. Ōsashi was sunk in March 6, 1946.
Design
Armor
Target ship of Japanese navy have restrictive armor to prevent training bombs. Boats were stored under protection deck around funnel.
“DS” is a Ducol-steel (structure steel). This armor able to prevent 10 kg training bombs.
Deck armor is 25-22 mm DS, and wall of superstructure is 16 mm DS. Side of hull is 18 mm MS. Layout of armor is shown on drawing below
note: side armor steel are not shown.
Armament
It was designed for bombing target, but due to worsening of war, IJN require ability of escort ship. Because of it, she had very superior AA armaments. (When training, they remove weapons)
Layout of weapons are shown on drawing below. Depth charge rails will be placed on stern.
Note: In this drawing there aren’t depth charge rails, and Mk.13 Radar was installed.
45 caliber 10th Year Type 12 cm High Angle Gun / 四十五口径十年式十二糎高角砲
Japanese standard naval AA gun based upon 45 caliber 3rd Year Type 12 cm naval gun. Ohama class equip single mount with shield. (Same as Syonan’s front main gun)
Specification
Mounting
- Model C Single mount
- Elevation: -10° / +75°
- Elevation rate: probably 6.5°/s
- Train rate: probably 10°/s
Projectile
- Segment shell (≒shrapnel)
- Fuse
- 50 seconds
- 30 seconds
- Fuse
- Common (ex. Mark 4 Common)
- Projectile weight: 20.3 kg
- Explosive: Shimose, 1.536 kg
- Velocity: 825 m/s
- Fuse
- Type 91 time fuse (delay: 0-55 sec)
- Type 88 impact fuse
- Type 88 impact fuse Kai 1
- Type 88 impact fuse Model 2
- Time fuse training shell
- Target shell
- Star shell Ko
- Type 3 Star shell
- Training shell
- Experimental Type 1 Common
- Projectile weight: 20.3 kg
- Explosive: 1.9 kg
- Velocity: 825 m/s
- Anti-Submarine Shell
- Projectile weight: 16.4 kg
- Velocity: 250 m/s
- Fuse
- Anti-Submarine fuse Model 1 (delay: 5 sec)
- Type 4 Incendiary Shrapnel AA shell
- Projectile weight: 20.3 kg
- Velocity: 700 m/s
- Fuse
- Type 91 time fuse Kai 1 (delay: 0-55 sec)
- Type 0 time fuse (delay: same as Type 91)
Type 96 25 mm Machine Gun / 九六式二十五粍機銃
Japanese most famous naval AA gun machine gun during WW2.
Specification
Projectile
- Common
- Explosives: TNT 66 % + Aluminum 34 %, 15.3 g
- Tracer: N/A
- Fuse: Impact
- Tracer Common
- Explosives: TNT 66 % + Aluminum 34 %, 20.4 g
- Tracer: Red, 5.7 seconds (about 2,600 m)
- Fuse: Impact
- Tracer Common Kai 1
- Tracer: Blue (2.9 s, 1,600 m) ⇒ Red (5.7 s, 2,600 m)
- Fuse: Impact
- Tracer Common Kai 2
- Tracer: Yellow, over 4.5 seconds
- Fuse: Impact
- Tracer Common Model 2
- Self-destruction: 3,000 m (7 sec) - 4,100 m (12 sec)
- Tracer: Yellow, over 4.6 seconds (2,600 m)
- Fuse: Impact
- Tracer Common Model 2 Kai 1
- Self-destruction: 4,000 m (10 sec) - 4,500 m (16 sec)
- Tracer: Yellow, over 6 seconds (3,100 m)
- Fuse: Impact
- Tracer
- Explosive: N/A
- Tracer: Red
- Fuse: N/A
- Tracer Kai 1
- Explosive: N/A
- Tracer: Blue ⇒ Red
- Fuse: N/A
- Tracer Kai 2
- Explosive: N/A
- Tracer: Yellow
- Fuse: N/A
- Tracer Indicator (Paint shell to indicate submarines)
- Tracer: Yellow
- Paint: Green
- Fuse: Impact
- Incendiary Common
- Explosive: TNT 66% + Aluminum 34 %, 5.7 g
- Incendiary: Yellow phosphorus, 13 g
- Tracer: N/A
- Fuse: Impact
- Incendiary Common
- Explosive: TNT 66% + Aluminum 34 %, 5.7 g
- Incendiary: Yellow phosphorus, Amount unknown
- Tracer: N/A
- Fuse: Impact
- Armor-Piercing
- Special filling: Red Iron Oxide
- Tracer: Yellow, 8.65 g
- Fuse: N/A
- Armor Piecing Model 2
- Special filling: N/A
- Tracer: Yellow
- Fuse: N/A
- Training shell
Type 2 Depth Charge / 二式爆雷
Japanese depth charge that modify Type 95 depth charge.
Specification
- Length: 775 mm
- Diameter: 450 mm
- Thickness: 4 mm
- Total weight: 160 kg
- Can weight: 60 kg
- Explosive capacity: 102 l
- Explosives
- Type 2 depth charge: Type 88, 100 kg
- Type 2 depth charge Kai 1: Type 97 or Type 98, 150 kg
- Type 2 depth charge Kai 2: Type 1 or K3, 110 kg
- Detonation depth: 30 m, 60 m, 90 m, 120 m, 150 m
- Sinking speed: about 2 m/s
Specification
- Full-load displacement: 3,285 t
- Length overall: 119.75 m
- Speed: 32.5 kt (60.19 km/h)
- Weapon
- 2x 12 cm/45 single AA guns
- 4x 25 mm triple machine guns
- 20x 25 mm single machine guns
- 36x Depth charges
- 1x Depth charge rail
- 4x “K-gun” depth charge launchers
- Engine: 2x Turbine
- Boiler: 3x Ro-Go Boiler
- Power: 52,000 SHP
For game
Pros
- You can be a true bombing target!
- Excellent speed (32.5 kt). Faster than almost all gun boats and escort ships.
- 12 cm gun have good rate of fire.
- Good machine gun armament (total 32x 25 mm machine gun). It is easy to sweep PT-boats and aircraft.
Cons
- Did not have any torpedoes.
- Unsatisfactory depth charge equipment.
- Main caliber gun is only two.
- Her armor can prevent only aircraft machine guns.
She have speed like a destroyer, and AA armament like a escort ships so she can be good gunboat successor of Syonan!
Reference
(Eds.) Makino Shigeru[牧野茂], Fukui Shizuo[福井静雄] (December 4, 1954) “Navy Shipbuilding Technology Overview, Volume 4[海軍造船技術概要 第四分冊]” pp.931-936
Author: Navy technical rear admiral Katayama Yuki [片山有樹], Navy technical captain Inagawa Seiishi [稲川精一], Makino Shigeru[牧野茂], Shioyama Sakuichi[塩山策一] Ozono Daisuke [大薗大輔], Matsumoto Kitaro [松本喜太郎], Navy technical commander Toyama Kouichi[遠山光一], Navy technical Lt. commander Fukui Shizuo[福井静雄]
Published by KON NICHI NO WADAISHA [今日の話題社] in 1987
ISBN4-87565-205-4
Administrative Division, 2nd Demobilization Bureau (1947) “Japanese Naval Vessels at the End of War” page 102