SZ-155 STRATOSPHERIC AIRSHIP

The SZ-155 STRATOSPHERIC AIRSHIP is a high-altitude, solar-powered platform designed for persistent stratospheric operations with applications to fields like communications, Earth observation, and wildfire detection. It was developed by Stratoship, an Australian aerospace startup founded in 2020 by Daniel Field. The design is based on the experience gained in the development of a high-altitude balloon called "The Pebble" flown in 2021.

In the image at left we can see the only known image of the fully-inflated airship during an indoor test.

Although Stratoship does not disclose full technical specifications such as length, volume, or material specifics in its public updates, what we know is that the SZ-155 is the first fully sovereign-designed and built HAPS prototype, sized to carry multiple payload types to ~20�km altitude. The platform features a solar-powered envelope (likely multi-layered composite) with an internal structure optimized for high-altitude pressure stability and gas-tight integrity to minimize helium leakage.

Propulsion is achieved via electric motors and propellers.

Balloon launched on: 10/12/2022
Launch site: Queensland, Australia  
Balloon launched by: Stratoship
Balloon manufacturer/size/composition: Stratospheric Airship  
End of flight (L for landing time, W for last contact, otherwise termination time): 10/12/2022

This was the first test flight of the SZ-155 high-altitude airship as part of RMIT's HAPS Challenge Phase 3. The HAPS Challenge is a joint effort between the Department of Defence (through the RAAF Plan Jericho and the Air Warfare Centre), Defence Artificial Intelligence, Trusted Autonomous Systems, SmartSat CRC and the RMIT's Sir Lawrence Wackett Defence and Aerospace Centre.

The vehicle was launched from north-western Queensland, Australia on the 12th of October, 2022 and was initially successful, however had to be terminated due to airspace constraints. The system was recovered in full, and some minor damage consistent with landing impact was identified. The flight, while not reaching full altitude, provided rich learning outcomes for the future.

• Stratoship Website