Loon

Flight System
The Loon Flight System consists of three separate systems: The balloon envelope, the bus, and payload. Together, they work seamlessly to provide lift, monitor flight telemetry, and provide connectivity.
1
The balloon envelope
2
The bus
3
The payload
Balloon Envelope
Made from polyethylene, each tennis-court-sized balloon envelope actually consists of a balloon inside of a balloon. A fixed amount of lift gas in the inner balloon keeps the system aloft. Adding or releasing outside air to the outer balloon changes density, allowing the system to ascend or descend when needed. Our balloons are built to last for hundreds of days before landing back on Earth in a controlled descent.
Bus
The bus consists of the hardware necessary for safe flight operations, including highly efficient solar panels that power the system, an altitude control system for navigation, and a parachute that deploys automatically to guide the balloon safely back to Earth after flight. For added safety, Loon includes redundant satellite communications links and transponders for constant visibility to air traffic control.
Payload
The payload consists of the communications equipment required to deliver connectivity, including the radio base station and antennas.
Post-Flight Analysis
Once recovered, balloons are laid out on a giant scanner to be inspected for microscopic holes and tears. This process paints a picture of how our balloons react to conditions in the stratosphere. Conducting this analysis provides insights that further inform our design choices, enabling the team to develop balloons capable of increasingly longer flight durations.
Operating at Scale
Loon has made significant breakthroughs in both building technology that can stay in the stratosphere for hundreds of days, and that can remain in one space long enough to meaningfully provide coverage.
1M+
flight hours since 2013
250
systems launched in 2019
1,750
total launches since 2013
300+
days duration record (ongoing)