// PROPULSION SYSTEMS AND ENGINE TECHNOLOGY TERM
Hybrid Rocket
A hybrid rocket is a type of rocket engine that uses propellants from two different states of matter, typically a solid fuel and a liquid or gaseous oxidizer, stored separately and combined in a combustion chamber to produce thrust. This design offers enhanced safety and the ability to throttle thrust compared to traditional solid rockets.

TECHNICAL DEFINITION
A hybrid rocket engine is a chemical propulsion system characterized by its use of propellants in two distinct phases: a solid fuel grain and a liquid or gaseous oxidizer, which react within a combustion chamber to generate exhaust thrust. This configuration provides advantages such as increased safety, throttling capability, and lower complexity compared to liquid bi-propellant systems, making them suitable for applications ranging from educational projects to suborbital spaceflight and potentially space tourism.
BACKGROUND
A hybrid-propellant rocket is a rocket with a rocket motor that uses rocket propellants in two different phases: one solid and the other either gas or liquid. The hybrid rocket concept can be traced back to the early 1930s.
READ MORE ON WIKIPEDIASYNONYMS & ALIASES
- Hybrid motor
- Hybrid rocket engine
- Solid-liquid rocket
- Hybrid propellant rocket
USAGE NOTE
Hybrid rockets are valued for their safety, lower environmental impact, and controllable thrust, making them suitable for commercial space tourism, sounding rockets, and student projects.
DEVELOPERS
Organizations developing technology related to Hybrid Rocket.
SNC has a strong heritage in propulsion, including hybrid rocket technology, through its acquisition of Orbital Technologies Corporation (ORBITEC), a long-time developer of hybrid systems.
A Nordic aerospace and defense company that actively develops and tests hybrid rocket motors for various applications, including sounding rockets and other space initiatives.
An Australian company focused on developing and launching small satellites using their proprietary hybrid rocket engines.
A German launch service provider developing a new generation of hybrid rocket propulsion systems for commercial small satellite launches.
Various NASA centers, such as Marshall Space Flight Center and Glenn Research Center, conduct research and development into advanced propulsion technologies, including hybrid rockets, often in collaboration with commercial partners and academia.
AFRL explores and develops a wide range of advanced propulsion technologies for military and space applications, with a history of research into hybrid rocket systems.
A Romanian aerospace company that has developed and tested hybrid rocket engines and launch vehicles for space access.