Sora Aviation, the UK-based developer of the 30-seat S-1 eVTOL aircraft, reports it has completed an extensive programme of vertical take-off and landing (VTOL) flight testing with its subscale S1 demonstrator, “marking a significant milestone in the aircraft’s development,” sid the company in a press release.
The demonstrator has been flying regularly for several months, with dozens of successful flights completed to date, said the company. “The S-1 test vehicle was specifically designed to generate representative aerodynamic and flight dynamics data. The demonstrator’s outer mould line (OML) faithfully replicates the geometry of the full-scale S-1, including its control surfaces, proprotor positioning, and centre of gravity location. This ensures that the aircraft exhibits flight characteristics that are directly relevant to the full-scale design. The programme has also provided a robust validation of Sora’s proprietary flight control system architecture. Developed in-house, the system is supported by comprehensive Software-in-the-Loop (SITL) and Hardware-in-the-Loop (HITL) development workflows, enabling extensive verification prior to flight and significantly reducing flight test risk. Data gathered during the campaign has successfully demonstrated the effectiveness of the S-1 flight control system as well as validated low-speed handling qualities and aircraft performance predictions, providing increasing confidence in the design as development progresses.”
“Flight testing is one of several complementary tools we use to build confidence in the aircraft design,” said D. Luke Bowen, Senior Aerodynamics Engineer at Sora Aviation. “The data we’ve collected has shown excellent correlation with our flight dynamics models and simulation results. While subscale testing inevitably comes with limitations, particularly in perfectly matching full-scale Reynolds number effects, we have developed a targeted test methodology focused on the areas where representative data can be obtained most effectively. This allows us to directly validate our analysis methods and improve the accuracy of our predictive tools as we progress toward fullscale flight.”
Sora Aviation is targeting first flight of its full-scale S-1 prototype in 2028.
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