*dctpbpenn

Japanese 'Boats' and Small Craft

29 posts in this topic

On ‎11‎.‎2‎.‎2017 at 8:39 PM, *dctpbpenn said:

I think it is likely. They will probably be the largest vessels on the list (Not too much longer compared to the sub-chasers, but certainly much heavier). 

 

About 50% larger in length than the german artillery barge. I doubt they will happen as they probably cannot navigate the English Shore map. Not to mention their armament (and crew count) is in another league compared to boats, especially late war.

Edited by tizianenel
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As of right now, the possibility of their inclusion is not immediately apparent. However, Gaijin has stated that they are starting small and things will begin to become noticeably larger, and that they may get up to Destroyers. The CH-13 / No. 13 Class Submarine Chaser has already been confirmed, so I do not think Kaibokan are too far off.

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10 minutes ago, *dctpbpenn said:

The CH-13 / No. 13 Class Submarine Chaser has already been confirmed, so I do not think Kaibokan are too far off.

Just about 20 m, 32 mm, and 80 men off (compared to MZ 1)

 

The biggest difference is the large crew. At the moment it would take a considerable time to kill 160 men, especially on a vessel of this size.

I would say that we need ton conduct more test until we figure out how to cut bigger vessels down.

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On 2016/8/21 at 1:51 PM, *dctpbpenn said:

Type 5 Large Escort Boat 1945

 

  Reveal hidden contents

HWT2NsF.jpg?1

NutSuCh.jpg?1

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Data deficient unless someone has access to and can translate the book whose cover is featured. Two versions Ko (steel) and Otsu (wood) considered. At least two prototypes of Otsu constructed. Likely armed with Type 88 75 mm AA Gun and two Type 93 13 mm Heavy Machine Gun pairings or a pair of Type 98 20 mm AA Cannons (Depth Charges?).

 

Ko
Length : 28.55 m
Beam : 4.35 m
Depth : 2.25 m

Otsu
Length : 26.83 m
Beam : 4.00 m
Depth : 2.25 m

 

Source:

Axis History Forums: Gunboats and escorts of the Japanese Army

 

I translate Type 5 Wooden Large Escort Boat Ko & Otsu Speck sheet from manual !!!!

Quote

Type 4 7.5cm ship gun speck sheet (Source: Manual P.12, P22-24)

Based gun

Type 99 7.5cm Tank gun

On Type 41 7.5cm Mountain gun carriage

All-up weight

About 850 kg

Horizontal fire angle

360°

Vertical fire angle

+60°~ -12°

Use shell

Type 94 HE for

Type 41 Mountain gun

Gunner

1 or 2 (*1)

Loader

Except for gunner

後座長

830-890 mm

*1: Use trigger: 1 crew / Use firing lanyard: 2 crew

*2: 後座長 means Distance to retreat Recoil buffer. I don't know what call it in English.

Type 4 cylinder based 20mm twin machine cannon (Source: Manual P.12)

Based gun

Type 98 AA machine cannon

All-up weight

About 850 kg

Horizontal fire angle

360°

Vertical fire angle

+80°~ -30°

Use shell

Type 100 HEFI-T*

(Maybe Time fuse)

AA mine discharger

8cm AA mine discharger

Caliber

8.103 cm

Weight

28 kg

Type 4 HE shell

Full weight

1.360 kg

Full cartridge weight

1.760 kg

Air burst time

About 12 sec.

Duration

About 12 sec.

Descent speed

7.5 m/s

Type 4 Smoke shell

Full weight

1.410 kg

Full cartridge weight

1.810 kg

Air burst time

About 12 sec.

Duration

About 80 sec.

Descent speed

7.5 m/s

↓About AA mine discharger↓

Source: JACAR 高射兵器重要諸元表 昭和20年4月

  Hide contents

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Illustrate by me. XD

Depth Charge Dropper

Now I searching explanation about is from manual...

Quote

Type 5 Wooden Large Escort Boat (Ko) Speck sheet from this manual

Part

Speck

Model

Wooden Western Displacement Boat

Total length

28.550 m

Max width

4.350 m

Depth

2.250 m

 

Light load

Normal load

Full load

Displacement

Print unclear

81.850 t

90.000 t

Average draft

1.480 m

1.985 m

1.970 m

Max speed

13.5 knot (Full load)

Cruise speed

12.5 knot (Full load)

Fuel capacity

8.600 t

Cruising range

6 days

Engine

350 hp “Diesel” engine ×2

 

Max

Cruise

Shaft horsepower

350 hp

280 hp

Revolutions per minute

900 rpm

833 rpm

Direction of shaft rotation

Right see from Stern (*1)

Use fuel

Heavy oil

Use dope

Mobile oil

Propeller diameter

0.850 m

Propeller pitch

0.680 m

Propeller pitch ratio

0.80

Propeller expanded area ratio

0.59

Propeller blade number

3

Type 4 7.5cm Ship gun (*2)

1

Type 4 cylinder based

20mm twin machine cannon

2

AA mine discharger

4

Depth charge dropper

2

Ship mounted radio Ko

1 set

Car mounted radio Hei

1 set

Smoke generator

1 set

 

*1 Original word: 艫ヨリ見テ右 I don't have enough English skill to translate this, sorry.

Quote

Type 5 Wooden Large Escort Boat Otsu Speck sheet from this manual

Part

Speck

Model

Wooden Western Displacement Boat

Total length

26.830 m

Max width

4.000 m

Depth

2.250 m

 

Light load

Normal load

Full load

Displacement

43.000 t

56.000 t

60.000 t

Average draft

1.140 m

1.300 m

1.350 m

Max speed

12.5 knot (Full load)

Cruise speed

12 knot (Full load)

Fuel capacity

 6.300 t

Cruising range

6 days

Engine

“Wesselmann” engine ×2 (*1)

 

Max

Cruise

Shaft horsepower

160 hp

150 hp

Revolutions per minute

1030 rpm

1000 rpm

Direction of shaft rotation

Left see from Stern (*2)

Use fuel

Light oil

Use dope

Mobile oil

Propeller diameter

0.700 m

Propeller pitch

0.560 m

Propeller pitch ratio

0.80

Propeller expanded area ratio

0.56

Propeller blade number

3

Type 4 7.5cm Ship gun

1

Type 4 cylinder based

20mm twin machine cannon

2

AA mine discharger

4

Depth charge dropper

2

Ship mounted radio Ko

1 set

Car mounted radio Hei

1 set

Smoke generator

1 set

 

*1: Original word: 「ベツセルマン」発動機. I don't know what is this...

*2 Original word: 艫ヨリ見テ左 I don't have enough English skill to translate this, sorry.

 

Type 5 Wooden Escort Boat's develop code name is Kei-tei, けい艇. Kei-tei Ko is designed Steel boat, but this project was stopped. Kei-tei Otsu is designed Wooden boat, and it was adopted Type 5 Wooden Large Escort Boat , 五式木製大護衛艇. AND, Type 5 Large Escort Boat has two models: Ko and Otsu. It's very very complicated!

Edited by aizenns
Fix miss, sorry
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