This page is a list of all the known rocket & jet engines for aircraft that were developed by Japan during World War II, including production, prototypes, and paper.

*Tables scroll on mobile!

Rocket:

Engine NameFormatMean ThrustWeightFuelLen. x Dia.Fuel Cons.DesignerMfr.ServiceNotes
4FR110,
Type 4 Mk.1 Rocket Mod.10
Solid Rocket700kgf
~3.0s
11.2kg
(powder)
343 Special FDT23.73kg/sNavycarrier RATO for Tenzan etc
4FH110,
Type 4 Mk.1 Rocket Mod.10
Solid Rocket400kgf
~10.0s
22.2kg
(powder)
70kg
500 Special FDT61290x257mm2.22kg/sNavyaerial wing booster, Ōka Mod.11
4FR120,
Type 4 Mk.1 Rocket Mod.20
Solid Rocket800kgf
~10.0s
43.9kg
(powder)
120kg
500 Special FDT64.39kg/sNavyRATO for large planes
4FH120,
Type 4 Mk.1 Rocket Mod.20
Solid Rocket800kgf
~10.0s
43.9kg
(powder)
120kg
500 Special FDT62090x257mm4.39kg/sNavyŌka Mod.11 engines
4FH121,
Type 4 Mk.1 Rocket Mod.21
Solid Rocket800kgf
~10.0s
43.9kg
(powder)
120kg
500 Special FDT61790x252mm4.39kg/sNavyaerial fuselage booster, Suisei Mod.43
4FH130,
Type 4 Mk.1 Rocket Mod.30
Solid Rocket400kgf
~10.0s
22.2kg
(powder)
500 Special FDT62.22kg/sNavyŌka trainer engine
4FR140,
Type 4 Mk.1 Rocket Mod.40
Solid Rocket2,100kgf
~3.5s
44kg
(powder)
343 Special FDT212.57kg/sNavyŌka Mod.43 catapult cart rockets
Toku-Ro Mk.1 Mod.1*Liquid Rocket130kgf
(150kgf)
H₂O₂820x[?]mmMitsubishiMitsubishiArmyKi-148 engine, Ki-48, Ki-102 aux?
Toku-Ro Mk.1 Mod.2*Liquid Rocket240kgf
(300kgf)
H₂O₂MitsubishiMitsubishiArmyKi-147 engine, (Ki-67 aux?)
Toku-Ro Mk.1 Mod.3*Liquid Rocket500kgfH₂O₂MitsubishiMitsubishiArmyMaybe 2 Mod.2s taped together,
Ki-109 aux
KR10,
Toku-Ro Mk.2
Liquid Rocket1,500kgf170kgRo-Gō Otsu Fuel2523x904mm8.75kg/sMitsubishiMitsubishi, Kūgishō, Army Air ArsenalNavy/Army, Army controlShūsui engine
KR20Liquid Rocket1,500kgf170kgRo-Gō Otsu Fuel2523x904mm8.75kg/sMitsubishiMitsubishiNavyShūsui engine, thicker turbopump shaft
KR22Liquid Rocket1,500kgf170kgRo-Gō Otsu Fuel2523x904mm8.75kg/sHiro
Arsenal
Hiro
Arsenal
NavyShūsui engine, triple turbopump shaft support
Toku-Ro Mk.3Liquid Rocket1,500kgf
+80-400kgf
Ro-Gō Otsu FuelArmy Air ArsenalArmyToku-Ro Mk.2 + cruise rocket
Toku-Ro Mk.4Liquid RocketArmy Air ArsenalArmyunknown
*Toku-Ro Mk.1 specs are very contradictory between both primary and secondary sources, not positive on data or use

Turbojet (‘Turbine Rocket’):

Engine NameFormatOutputRPMWeightLen. x Dia.SFCDesignerMfr.ServiceNotes
TR1C-AN-1AT300kgf16,000KūgishōEbaraNavy1st IJN jet
Ne-33A-AN-1AT350kgf8,300309kg2321x760mm2.9kg/kgf/hrGikenKawasakiArmy1st IJA turbojet
Ne-41C-AN-1AT280kgf11,000270kg1700x750mm2.5kg/kgf/hrGikenKawasakiArmy
TR10/Ne-101C-AN-1AT300kgf16,0001600x850mmKūgishōKūgishō, Mitsubishi, Hitachi Mfg, Ishikawajima Air, IST, NakajimaNavyimproved TR for trial and error production
TR10 Kai/Ne-10 Kai4A+1C-AN-1AT300kgf15,000KūgishōKūgishōNavyNe-10 + 4 axial stages
TR12/Ne-124A+1C-AN-1AT315kgf15,000388kg2102x854mmKūgishōKūgishōNavyoriginal Kikka engine
TR12 Kai/Ne-12B4A+1C-AN-1AT320kgf15,000315kg1800x855mm1.65kg/kgf/hrKūgishōKūgishō,
Yokosuka Yard
Navylightened Ne-12
TR15/Ne-158A-AN-1AT320kgfKūgishōNavyNe-20 predecessor plan
TR20/Ne-208A-AN-1AT490kgf11,000470kg2704x620mm1.36kg/kgf/hrKūgishōKūgishō,
Yokosuka Yard, IST
NavyKikka/Oka 33&43 engine
Ne-20 Kai6A-AN-1AT650kgf11,000KūgishōNavyKikka fighter engine
TR30/Ne-304A+1C-AN-1AT850kgf15,000900kg2470x1030mm1.29kg/kgf/hrKūgishōKūgishōNavyupscaled Ne-10 Kai
Ne-130 (Ne-201II)7A-AN-1AT908kgf9,000900kg3850x850mm1.28kg/kgf/hrKōken, GikenISTArmyKi-201 engine
TR140/Ne-1409A-AN-1AT?~4,000hp equiv.KūgishōKūgishō, ISTNavyconverted GTPR
TR230/Ne-2307A-AN-1AT885kgf8,100870kg3430x762mm1.32kg/kgf/hrNakajimaNakajima,
Hitachi Mfg.
Army/NavyKi-201 engine
TR330/Ne-3307A-7C-1AT1,320kgf7,6001,200kg4000x880mm1.40kg/kgf/hrMitsubishiMitsubishi,
Niigata
Army/NavyR2Y2 engine

Engine Jet (‘Motor Turbine Propeller Rocket’):

Engine NameFormatOutputRPMWeightLen. x Dia.SFCDesignerMfr.ServiceNotes
TR Hardware,
MTPR
Prop-‘Atsuta’-(?)C-AN-(?)T3,000hp
+1,000kgf
Hitachi Mfg.Hitachi Mfg.NavyNavy DB601-based jet.
compound engine, linking of turbojet
and piston engine driving prop

Motorjet (‘Engine Rocket’):

Engine NameFormatOutputRPMWeightLen. x Dia.SFCDesignerMfr.ServiceNotes
Sakae IPR‘Sakae’-5A-AN604kgf4169x912mmKūgishōKūgishōNavy
Homare IPR‘Homare’-3A-AN1,396kgfKūgishōNavy
Ne-1Engine-2A-AN190kgf1050x750mm3.9kg/kgf/hrGikenKawasakiArmyauxiliary engine for Ki-48II
Ne-2Engine-1C-AN150kgfGikenKawasakiArmyauxiliary engine for Ki-48II
Ne-101‘Ha-40’-1A-AN1,000kgfGiken, KōkenArmyArmy DB601-based jet
Hatsukaze Rocket,
Tsu-11
‘Hatsukaze’-1A-AN220kgf9,000200kg2200x640mm4.33kg/kgf/hrKūgishōHitachi Air.Navyoriginal Kikka substitute engine

Turboprop (‘Gas Turbine Propeller Rocket’):

Engine NameFormatOutputRPMWeightLen. x Dia.SFCDesignerMfr.ServiceNotes
GT Hardware,
GTPR
Prop-16A-AN-5AT3,000hp
+2,000hp (equiv. thrust)
5,300KūgishōKūgishō, ISTNavyfor large flying boat
GTPR IIProp-12A-AN-5AT3,000hp
+2,000hp (equiv. thrust)
5,0002,500kg5500x850mmKūgishōKūgishō, ISTNavyiterative design of GTPR
Ha-Ta 1,
Ken-8,
Ne-201
Prop-19A-4C-5AT1,870hp
+582kgf
4,2002,500kg5750x1100mm0.68kg/shp/hrKо̄kenISTArmyonly completed JP turboprop

Ramjet (‘Dynamic Pressure Rocket’):

Engine NameFormatOutputRPMWeightLen. x Dia.SFCDesignerMfr.ServiceNotes
Ne-0AN60kgf02100x600mm9.8kg/kgf/hrKōkenKawasakiArmy1st IJA jet
UnknownANn/a0~4000x1000mmKūgishō?Kūgishō?Navy?unknown 1943 ramjet. maybe Mitsubishi-made
Kayaba Mod.1AN750kgf0KayabaKayabaArmyramjet for tailless plane, commissioned by IJA, not built

Pulsejet (‘Intermittent Combustion Rocket’):

Engine NameFormatOutputRPMWeightLen. x Dia.SFCDesignerMfr.ServiceNotes
Ka-10Valve-AN300kgf0150kg3700x580mm3.84kg/kgf/hrKūgishōKūgishō, Sagami ArsenalNavybased on V1 Argus engine
Ka-10 (Small)Valve-AN0KūgishōKūgishōNavyprototype of Ka-10

Navy Solid Rocket Naming System
  • 1st Number: Type designation
  • Lettering:
    • F = ‘Funshin-ki’ 噴進器 (Rocket) [?? otherwise English ‘for’]
      • R = ‘Ririku’ 離陸 (Takeoff) [takeoff booster use]
      • H = ‘Hikouki’ 飛行機 (Airplane) [mid-air booster use]
  • 2nd Number: Mark designation
  • Remaining Numbers: Model designation

Examples:
4FR110 = Type 4 Mark 1 Rocket Model 10 (for Takeoff)
4FH120 = Type 4 Mark 1 Rocket Model 20 (for Airplane)


Army Early Jet Engine Naming System (Before Autumn 1944)
  • Prefix:
    • ‘Ne’ = ‘Nenshō Funsha Suishin-ki’ 燃焼噴射推進器 (Combustion Jet – Jet Engine)
  • First Number:
    • no = low power class engine
    • 10 = medium power class engine
    • 20 = high power class engine
  • Last Number:
    • Number in the series, starting from 1

Examples:
Ne-2 = low power class engine 2
Ne-201 = high power class engine 1

(note – this explanation is the author’s theory.)


Navy Early Jet Engine Naming System (Before Autumn 1944)
  • Prefix:
    • ‘TR’ = Tābin Roketto タービンロケット (Turbine Rocket – Turbojet)
  • First Number:
    • none = made by Kūgishō
    • 1 = made by Ishikawajima Shibaura Turbine
    • 2 = made by Hitachi/Nakajima
    • 3 = made by Mitsubishi
  • Mid Number:
    • 1 = 1,000hp class equivalent
    • 2 = 2,000hp class equivalent
    • 3 = 3,000hp class equivalent
    • 4 = 4,000hp class equivalent
  • Last Number:
    • Engine variant in that series, starting from 0

Examples:
TR10 = Kūgishō 1,000hp-class jet, variant 1.
TR12 = Kūgishō 1,000hp-class jet, variant 3.
TR140 = Ishikawajima 4,000hp-class jet, variant 1.


Army/Navy Unified Jet Engine Naming System (After Autumn 1944)
  • Prefix:
    • ‘Ne’ ネ = ‘Nenshō Funshin-ki’ 燃焼噴進器 (Combustion Jet – Jet Engine)
    • ‘Ka’ カ = ‘Kanketsu Nenshō Roketto’ 間歇燃焼ロケット (Intermittent Combustion Rocket – Pulsejet)
    • ‘Tsu’ ツ = Unknown (Motorjet)
  • First Number:
    • none = made by Kūgishō
    • 1 = made by Ishikawajima Shibaura Turbine
    • 2 = made by Hitachi/Nakajima
    • 3 = made by Mitsubishi
  • Mid Number:
    • 1 = 1,000hp class equivalent
    • 2 = 2,000hp class equivalent
    • 3 = 3,000hp class equivalent
    • 4 = 4,000hp class equivalent
  • Last Number:
    • Engine variant in that series, starting from 0

Examples:
Ne-20 = Kūgishō 2,000hp-class jet, variant 1.
Ne-330 = Mitsubishi 3,000hp-class jet, variant 1.


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