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Trials of the PHASA-35 35m solar-electric aircraft conducted collaboratively between BAE Systems, Prismatic and the UK MoD’s Defence Science and Technology Laboratory (Dstl) have included critical ‘soak’ tests, in which the aircraft demonstrated its ability to work effectively as a fully integrated system with Dstl’s communications sensor payload; an RF-sensing software-defined radio (SDR) that provides a real-time, secure data link.

The aircraft operated for 72 hours in a simulated environment that models the harsh stratospheric conditions in which the aircraft is designed to operate, further validating that its systems are able to endure the harsh temperature and pressure extremes experienced in the stratospheric environment.

Exploiting BAE Systems’ capabilities in digital testing and flight systems has enabled the testing to be completed through a series of highly representative ground-based tests, driving pace and reducing costs in the development phase of the programme. The tests, which were undertaken in a dedicated 40m hangar at Prismatic’s facility near Farnborough, also enabled the team to practice the various operations needed in flight, including the transition from daytime, when the aircraft is powered by the solar array, to night time, when the aircraft’s batteries are discharged.

BAE Systems and Prismatic have put the integration and operation of the user payload at the heart of the PHASA-35 design and it has been very satisfying to work with the team in so clearly showing the benefits of this approach. Dstl has a proud tradition of rapid proving of new technologies which provide military and security advantage, which this latest success reinforces,” commented Paul Mather, Principal Payload Adviser at Dstl.

Ian Muldowney, Chief Operating Officer, BAE Systems Air, added “PHASA-35 is a great example of how we’ve brought together the best in British expertise and partnered to drive technological innovation and deliver critical capability. This latest success, only eight months after PHASA-35’s maiden flight, further demonstrates how UK industry and our partners are accelerating pace to deliver the UK’s vision for innovation, a Future Combat Air System and information advantage.”

By taking the best from the large company experience that BAE Systems offers, together with the agility of a small, innovative company such as Prismatic, we’ve been able to drive the programme forward with continued pace, culminating in the seamless integration of this first payload. This is an important milestone in bringing PHASA-35 closer to market, working alongside DSTL in the process,” stated Prismatic Managing Director, Paul Brooks.

Further flight trials are due to take place in the coming months and this latest milestone is another step forward for the aircraft which could enter initial operations with customers within 12 months of completion of its flight trials programme.

The PHASA-35 high altitude, long endurance, unmanned aerial vehicle (HALE UAV), successfully completed its first flight in February, less than two years from initial design. The UAV has the potential to maintain flight for up to a year at a time, in the stratosphere, providing military and commercial customers with capabilities not currently available from existing air and space programmes. PHASA-35 has a wide range of potential applications such as the delivery of communications networks, including 5G, as well as support to disaster relief and border protection. Its payload capacity can be adapted to meet the needs of the user to carry sensors such as cameras, thermal imaging and communications equipment.

The aircraft’s long-life battery and highly efficient solar technology allow PHASA-35 to potentially maintain flight for up to a year operating in the stratosphere, the upper regions of the Earth’s atmosphere, and will plug the gap between aircraft and satellite technology.

With applications ranging  from persistent surveillance through border protection to communications relay, PHASA-35 has immense implications for the future of electrically-powered UAS. (Photo: BAE Systems)

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