TM 9-1985-5; Navy Rockets

Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition

Chapter 5 - Section 1

NAVY ROCKETS

Introduction

At the end of the war, the Japanese Navy had in production and use three rockets, a 12-cm incendiary-shrapnel, a 20-cm H.E., and a 45-cm H.E. Drawings and data of these three rockets are given in this section.

There were several other rockets in the experimental stage, and a chart listing the sa-lient features of these rockets is also given.

EXPERIMENTAL ROCKET DATA

Name	Purpose	Weight of charge (kg)	Kind of charge	Weight total (kg)	Diam. of motor (cm)	Diam. of head (cm)	Range (m)	Lateral dispersion	Longitudinal dispersion	Num- ber of nozz- les	Mini- mum nozzle diam. (mm)	Igniter black powder (gm)	Fuze	Launcher	Num- ber of grains	Outer diam. of grain (mm)	Inner diam. of grain (mm)	Length of grain (mm)	When developed	Remarks
20-cm I.S.R.	Barrage an A.A.		Incendiary bomb, shrapnel	88.9	20	20	3700			6	16.5	50	Type 5 combination, Model 1	Experimental	7	58	10		November 1944
20-cm S.C.R.	Antitank		Type 98		20	20	1500			6		50	Type 5 percussion, Model 2	Experimental					April 1945	Only experimental
18-cm S.C.R.	Antitak		Type 98		10	10	1000			6			Type 5 percussion, Model 2	Experimental					April 1945	Only experimental
15-cm H.E.R.	Depth charge		Type 91		15	15	3000	About 10 percent of range	About 10 percent of range	6			Antisubmarine fuze, Model 2.	Experimental					April 1945	Not used
12-cm H.E.R.	Barrage	1.63	Type 91		12	12	4800	About 10 percent of range	About 10 percent of range	6	11.5	30	Type 5 percussion, Model 2	Sextuple, mounted on 2 wheels	7	35	5	360	January 1945	Used on the "Shinzo"
10-cm H.E.R.	Barrage		Type 98	22.5	10	10	1200			6	6.5	15	Type 5 percussion, Model 1		7	39	5 and 10			Only experimental
10-cm S.C.R.	Antitank	1.59	Type 94		10	10	1200			6	6.5	15	Type 5 percussion, Model 1	Iron pipe	7	30	5 and 10		March 1945	Pierced armor 10- cm thick
8-cm H.E.R.	Barrage		Type 98	9.8	8	8	1200			6	5.5	8	Type 5 percussion, Model 1		7	16	9 and 5			Only experimental
8-cm S.C.R.	Antitank	0.53	Type 94		8	8	1200			6	5.5	8	Type 5 percussion, Model 1	Iron pipe	7	16	9 and 5		September 1944	Pierced armor 7- cm thick
2.5-cm H.E.R	Barrage			5.58	2.5	2.5	1000			6			Percussion, Model 4	Iron pipe					June 1944	Onyl experimental