Head to head

H-IIA vs Vostok 8A92

Two vehicles in the same payload class. Every figure below comes from the same two sources for both rockets, and a row appears only when both publish the input.

Payload to low Earth orbit

Relative

H-IIA: 10,000 kg

Vostok 8A92: 4,730 kg

Side by side

8 comparable figures

The highlighted value wins the row. Rows where neither direction is better, like length or stage count, highlight nothing.

Metric	H-IIA	Vostok 8A92
Flights flown	50	44
Success rate	98%	90.9%
Payload to LEO (kg)	10,000	4,730
Liftoff thrust (kN)	2,260	3,996
Length (m)	53	30.84
Diameter (m)	4	2.99
Launch mass (t)	285	281
Stages	2	2

H-IIA

Flight record

98% success rate49 of 50 flown · 1 failed

2001peak 2017 · 6 flights2025

Maiden flight 2001-08-29. Retired.

Vostok 8A92

Flight record

90.9% success rate40 of 44 flown · 4 failed

1962peak 1966 · 10 flights1967

Maiden flight 1962-06-01. Retired.

H-IIA is built by Mitsubishi Heavy Industries of Japan (company profile on Space Index).Vostok 8A92 is built by RKK Energiya of Russia.

Full specifications and the complete launch history for each: H-IIA · Vostok 8A92.

Specifications from Launch Library 2 by The Space Devs, launch records from Space Index. Derived figures are computed here; see sources and method.