UNA EXPRESS-II
UNA EXPRESS-II
Microgravity Test Platform
Microgravity Test Platform
Microgravity Test Platform
UNA EXPRESS-II
UNA EXPRESS-II is a two-stage suborbital launch vehicle designed to reach the Kármán line (100 km), the boundary between Earth and space, and provide a high-quality microgravity environment. It uses kerosene and liquid oxygen as propellants and is equipped with an electric pump-fed cycle and the VOLTA-52H engine.
UNA EXPRESS-II applies precision guidance and control, stage separation, and fairing separation technologies. It will verify the technologies required for satellite launch, secure reliability, and serve as a stepping stone toward UNA EXPRESS-III, UNASTELLA’s orbital launch vehicle.
Height
11.5 m
Diameter
1 m
Max Altitude
100 km
Engine
VOLTA-52H
Launch Site
Korea
VOLTA-52H engine
VOLTA-52H is Korea’s first launch vehicle engine to use an electric pump-fed cycle. As the embodiment of UNASTELLA’s core technologies, it delivers the world’s highest power output among launch vehicle engines using an electric pump-fed cycle.
Through UNA EXPRESS-I, UNASTELLA developed not only a flight-proven combustor but also all major components, including batteries, motors, inverters, and valves, entirely with domestic technology.
It also adopts a modular configuration for future engine clustering.
VOLTA-52H is undergoing performance testing across Korea, including Yeoju, Daejeon, Changwon, and Goheung, and is being prepared to become the heart of UNA EXPRESS-II. It produces 52 kN of thrust at sea level and 63.5 kN in vacuum, supporting mission performance with rapid startup stability and precise throttle control.
Thrust
52 kN
Propellant
LOX / JET A-1
Propellant Feed System
Elecpump-fed
UNA EXPRESS II
UNA EXPRESS-II
UNA EXPRESS-II is a two-stage suborbital launch vehicle designed to reach the Kármán line (100 km), the boundary between Earth and space, and provide a high-quality microgravity environment. It uses kerosene and liquid oxygen as propellants and is equipped with an electric pump-fed cycle and the VOLTA-52H engine.
UNA EXPRESS-II applies precision guidance and control, stage separation, and fairing separation technologies. It will verify the technologies required for satellite launch, secure reliability, and serve as a stepping stone toward UNA EXPRESS-III, UNASTELLA’s orbital launch vehicle.
UNA EXPRESS-II is a two-stage suborbital launch vehicle designed to reach the Kármán line (100 km), the boundary between Earth and space, and provide a high-quality microgravity environment. It uses kerosene and liquid oxygen as propellants and is equipped with an electric pump-fed cycle and the VOLTA-52H engine.
UNA EXPRESS-II applies precision guidance and control, stage separation, and fairing separation technologies. It will verify the technologies required for satellite launch, secure reliability, and serve as a stepping stone toward UNA EXPRESS-III, UNASTELLA’s orbital launch vehicle.
Height
Height
11.5 m
11.5 m
Diameter
Diameter
1 m
1 m
Max Altitude
Max Altitude
100 km
100 km
Engine
Engine
VOLTA-52H
VOLTA-52H
Launch Site
Launch Site
Korea
Korea
Korea
VOLTA-52H engine
VOLTA-52H is Korea’s first launch vehicle engine to use an electric pump-fed cycle. As the embodiment of UNASTELLA’s core technologies, it delivers the world’s highest power output among launch vehicle engines using an electric pump-fed cycle.
Through UNA EXPRESS-I, UNASTELLA developed not only a flight-proven combustor but also all major components, including batteries, motors, inverters, and valves, entirely with domestic technology.
It also adopts a modular configuration for future engine clustering.
VOLTA-52H is undergoing performance testing across Korea, including Yeoju, Daejeon, Changwon, and Goheung, and is being prepared to become the heart of UNA EXPRESS-II. It produces 52 kN of thrust at sea level and 63.5 kN in vacuum, supporting mission performance with rapid startup stability and precise throttle control.
Thrust
52 kN
Propellant
LOX / JET A-1
Propellant Feed System
Elecpump-fed
VOLTA-52H engine
VOLTA-52H is Korea’s first launch vehicle engine to use an electric pump-fed cycle. As the embodiment of UNASTELLA’s core technologies, it delivers the world’s highest power output among launch vehicle engines using an electric pump-fed cycle.
Through UNA EXPRESS-I, UNASTELLA developed not only a flight-proven combustor but also all major components, including batteries, motors, inverters, and valves, entirely with domestic technology.
It also adopts a modular configuration for future engine clustering.
VOLTA-52H is undergoing performance testing across Korea, including Yeoju, Daejeon, Changwon, and Goheung, and is being prepared to become the heart of UNA EXPRESS-II. It produces 52 kN of thrust at sea level and 63.5 kN in vacuum, supporting mission performance with rapid startup stability and precise throttle control.
Thrust
52 kN
Propellant
LOX / JET A-1
Propellant Feed System
Elecpump-fed
© 2026 UNASTELLA.
All rights reserved.
© 2026 UNASTELLA. All rights reserved.
© 2026 UNASTELLA.
All rights reserved.