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Photo: user:masamic · Wikimedia Commons · CC BY-SA 3.0
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Military Space Launch Vehicles · Japan · 1986
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H-I Photo: user:masamic · Wikimedia Commons · CC BY-SA 3.0
* Absolute score — assessed within category · no era adjustment
Payload Capacity
65
Reliability
70
Cost-Efficiency
55
Responsiveness / Cadence
40
Reusability
10
Orbit Versatility
60
Precision
50
Technology
75
Strategic Value
60
Human-Rating
30
Origin Japan
CategoryMilitary Space Launch Vehicles
EraCold War
In service1986–1992
Operators1 countries
Quantity9
Data Quality83%
54
Military Space Launch Vehicles MASS Rating
15/96
Cold War
70/296
All-Time
Military Space Launch Vehicles · 10 axes scored
Payload Capacity
65
Reliability
70
Cost-Efficiency
55
Responsiveness / Cadence
40
Reusability
10
Orbit Versatility
60
Precision
50
Technology
75
Strategic Value
60
Human-Rating
30
ⓘ Regardless of era, the same scoring system applies to all units in the military space launch vehicles category.
01 / Overview
H-I
Country
Production
1986–1992
Quantity
9
Operators
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
MILITARY SPACE LAUNCH VEHICLES · COLD WAR
15
PERFORMANCE/PRICE
65
UNIT COST (2025 USD)
—
54
military space launch vehicles category
ⓘ Performance/Price and MASS score are computed across all units in the military space launch vehicles category, regardless of era.
02 / Specs & Design
◎General5MOD.5
  • Vehicle TypeMedium-lift launch vehicle
  • First Flight1986
  • Stages2
  • StatusRetired
  • In ServiceNo
◈Performance7MOD.7
  • Payload to LEO3,200 kg
  • Payload to GTO1,100 kg
  • Liftoff Thrust2,344.5
  • Liftoff Mass142.26 t
  • Height42 m
  • Diameter2.44 m
  • Success Rate1
▣Propulsion5MOD.5
03 / History
SERVICE LIFESPANRetired
  1. 1986Production started
  2. 1992Production ended
40
years in service
6
years in production
9
units produced
0
countries operating
ⓘ 1 countries retired it.
04 / Operators
Operator Countries1country
📚 Sources
📖 ENCYCLOPEDIA Browse the Military Space Launch Vehicles entry →