Man-Maneuvering Units
Man-Maneuvering Units (MMUs), also known as astronaut-maneuvering-units (AMUs) or colloquially as space jetpacks, are nitrogen-propelled devices used by astronauts to maneuver in the vacuum of space during Extravehicular Activity (EVA).
Technical Overview & Evolution
- Functionality: Uses compressed nitrogen gas expelled through nozzles to provide thrust for translation and rotation in microgravity.
- Design: Typically backpack-mounted, allowing hands-free operation. Critical for safety and retrieval operations.
- Historical Context:
- Evolution from earlier simpler restraint systems to fully autonomous maneuvering capabilities.
- Designed to address the critical risk of an astronaut drifting away from the space-station or Space Shuttle.
- Operational Challenges:
- Finite propellant supply limits operational time and correction capability.
- Risk of disorientation or inability to stop rotation/translation if malfunctions occur.
- Physical strain on the astronaut due to pressure and movement constraints.