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IJA Daihatsu-class landing craft model D with 203mm rocket launcher


aizenns
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about 20cm rocket Daihatsu  

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  • Technical Moderator

20糎噴進砲装載大発動艇

Daihatsu with 20cm rocket cannon

qivep93.png

 

About "Daihatsu"

Daihatsu is a shorten of Dai-Hatsudoutei (Large motor-Boat, LB).

Daihatsu model.D (LB-D) is the last model, and produced thousands.

 

This boat is only landing craft but there are very good specification, and some of them used for gunboat to support landing forces and defend landing crafts. For example, in the battle of Guadalcanal some boat equip 37mm or 75mm gun and machine gun to fight PT-boats. Surprisingly there ace-Daihatsu captain that destroy lots of PT-boats and called "Tiger of Solomon" (only self-name, so battle result is unknown: but some PT-boats destroyed by Daihatsu)

 

In the late of the war Japanese needs lots of small boats to attack landing forces on Japanese coast. Lots of Daihatsu equip guns and Torpedo, but its not enough, so they develop Daihatsu with 20cm rocket!

This boat have only one 20cm rocket launcher, but able to reload shells by Derick. (Bullet case is under gun)

 

Off coerce, this boat specification is very low. But I think this boat is very good toy as Katyusha!!

 

Specifications of the boat

Type of ship

Steel, Displacement type

Length

14.88 m

Max width

3.610 m

Depth

1.538 m

Own weight

10.7 t

Loads

8.5 t

Draft

Bow

0.470 m

 

Stern

0.490 m

Speed

Full-load

7.5 kt

 

Light-load

8.5 kt

Engine

60 hp diesel

1

 

Propeller

1

Weapon

20cm rocket 

1

 

Specifications of the Type 4, 20cm rocket launcher

Caliber

203 mm

Barrel length

1920 mm

Wall thickness

7.5 mm

Weight

Barrel (front)

31 kg

 

Barrel (rear)

86 kg

 

Cradle

20 kg

 

Leg

44.5 kg

 

Bottom plate

44.0 kg

 

Total (include sight)

227.6 kg

Fire angle (vertical)

710 mil – 1160 mil

Fire angle (horizontal)

150 mil when vertical angle 800 mil

Spoiler

Y4Tuxps.png

 

 

Specifications of Type 4, 20cm rocket shell "Ro-Dan"

Explosives

TNT 16.500 kg

Propellant (max)

9600 g

Fuse delay

0.0 or 0.1 seconds

Max speed

175 m/s

RPM

3000 rpm

Propulsion time

2 seconds                  

Max range

2500 m

 

Blueprints

Daihatsu mod.D

Spoiler

kfj8Tou.gif

FTAkynV.jpg

Daihatsu with 20cm Rocket

Spoiler

FVKIVZH.jpg

ZzeaEAm.png

I2Zkrjh.png

Blueprints of shell

Spoiler

3N6iZv0.png

b3Tj7VI.png

 

Quote

mZ4h7zM.jpg

YrYRRCm.jpg

Quote

564px-Japanese_Type_4_20_cm_Rocket_Morta

Photo of Type 4 20cm rocket launcher, displayed at Yasukuni Shrine, Tokyo.

Shell is replica.

from Wikipedia

Quote

cCffqfJ.jpg

Propeller of Daihatsu (This photo is mod.A late)


 

Quote

 

Sources

JACAR ref.C14010904500

技術戦訓報20糎噴進砲装載大発動艇取扱要領書(案)/総説  (Manual of Daihatsu with 20cm rocket (draft) / review article)

 

JACAR ref.C14010904600

技術戦訓報20糎噴進砲装載大発動艇取扱要領書(案)/附図 (Manual of Daihatsu with 20cm rocket (draft) / attached blueprints)

 

JACAR ref.C14020226400

線図 (Lines of Daihatsu model D)

 

JACAR ref. A03032106200

試製二十糎ろ弾説明書 (Instructions of Experimental 20cm Ro-Dan shell)

 

JACAR ref. A03032119600

一技研3研報第九号(◎砲101)試製四式二十糎噴進砲研究報告 (Research report of Experimental Type 4, 20cm rocket launcher)

 

Okumoto Gou (2016) "Boats and Ships of Japanese Army: For Landing, Transporting, Escort, Attack and special ships", Dai-Nippon Kaiga publishers,pp.9, 15

Photo of This boat, Blueprint of Daihatsu

 

Edited by aizenns
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  • Senior Suggestion Moderator

Open for discussion. :salute:

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  • Suggestion Moderator

Do you know how many rockets were carried?

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  • Technical Moderator
On 31/10/2018 at 08:45, Miki_Hoshii said:

Do you know how many rockets were carried?

Sorry, I can’t find that data. But in drawing it seems 8 or 12 bullets.

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  • 2 months later...
  • 7 months later...

Again, this boat would be very difficult to use, so I'm iffy on adding it, but it could be put in the game.

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  • 1 month later...
  • Senior Suggestion Moderator

Suggestion passed to the developers for consideration.

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