9.45m
9.45m
9.45m
Height
Height
Height
0.7m
0.7m
0.7m
Diameter
Diameter
Diameter
50km
50km
50km
Max Altitude
Max Altitude
Max Altitude
VOLTA-52P
VOLTA-52P
VOLTA-52P
Engine
Engine
Engine
UNA EXPRESS-I
UNA EXPRESS-I
only T + 1198d from day zero
only T + 1198d from day zero
UNA EXPRESS-I
UNA EXPRESS-I is a single-stage suborbital launch vehicle for microgravity missions.
Powered by LOX / Jet A-1 and the VOLTA-52P pressure-fed engine, it was launched from UNASTELLA’s Goheung launch site in May 2025.
The flight completed planned verification of the vehicle and propulsion system.
Height
9.45 m
Diameter
0.7 m
Max Altitude
50 km
Engine
VOLTA-52P
Launch Site
Korea
UNA EXPRESS I
UNA EXPRESS-I
UNA EXPRESS-I is a single-stage suborbital launch vehicle that provides 40 seconds of microgravity. It uses kerosene and liquid oxygen as propellants and is equipped with the VOLTA-52P pressure-fed combustor.
UNASTELLA successfully launched UNA EXPRESS-I from its private launch site in Goheung, Jeollanam-do, in May 2025. UNA EXPRESS-I completed flight verification of the launch vehicle system and engine as designed.
UNA EXPRESS-I is a single-stage suborbital launch vehicle that provides 40 seconds of microgravity. It uses kerosene and liquid oxygen as propellants and is equipped with the VOLTA-52P pressure-fed combustor.
UNASTELLA successfully launched UNA EXPRESS-I from its private launch site in Goheung, Jeollanam-do, in May 2025. UNA EXPRESS-I completed flight verification of the launch vehicle system and engine as designed.
Height
9.45 m
Diameter
0.7 m
Max Altitude
50 km
Engine
VOLTA-52P
Launch Site
Korea
VOLTA-52P engine
VOLTA-52P is UNASTELLA’s first completed rocket engine and the propulsion system of UNA EXPRESS-I.
Built on a helium pressure-fed cycle with LOX / Jet A-1, it delivers 52 kN of thrust.
Thrust
52 kN
Propellant
LOX / JET A-1
Propellant Feed System
Pressure-fed
VOLTA-52P engine
VOLTA-52P is UNASTELLA’s first completed engine and has completed flight verification on UNA EXPRESS-I. Using a helium pressure-fed cycle, the engine was developed through performance testing at the combustion test facility in Yeoju and the vertical stage qualification facility at the Goheung launch site.
Thrust
52 kN
Propellant
LOX / JET A-1
Propellant Feed System
Pressure-fed
Payload
Payload
UNA EXPRESS-I carried microgravity fluid experiment payloads from KARI, KIMM, KBSI, KRIBB, and Chungnam National University.
High-speed telemetry captured payload data and video throughout the mission.
UNA EXPRESS-I carried microgravity fluid experiment payloads from KARI, KIMM, KBSI, KRIBB, and Chungnam National University. High-speed telemetry captured payload data and video throughout the mission.
UNA EXPRESS-I carried microgravity fluid experiment payloads from KARI, KIMM, KBSI, KRIBB, and Chungnam National University. High-speed telemetry captured payload data and video throughout the mission.
© 2026 UNASTELLA.
All rights reserved.
© 2026 UNASTELLA. All rights reserved.
© 2026 UNASTELLA.
All rights reserved.