Next stop: Oshkosh. The Across USA Tour continues with its seventh stop at EAA AirVenture Oshkosh 2025 — “The World’s Greatest Aviation Celebration” during a symposium on future of electric aviation (July 19-20) at the annual airshow (July 21-27)

H-55, the electric aviation pioneer born from the Solar Impulse project, has completed a series of high-density altitude, high-temperature demonstration flights in Colorado as part of its "Across USA Tour". These tests confirm the real-world performance of the H55 powered Bristell B23 Energic, illustrating the operational performance of electric aviation. 

The Colorado mission flights took place from an airfield situated at 5,800 feet above sea level, with temperatures reaching 36°C (96.8°F) and a takeoff density altitude of 9,500ft. The B23 Energic performed flawlessly providing smooth, 500 feet per minute climbs using normal runway distance for departures. This “hot and high” scenario tests an aircraft’s take-off distance, climb performance, and overall efficiency. In contrast to conventional combustion engines which face degraded performance in such operating environments, the electric propulsion system of the B23 Energic delivered steady and reliable results. 

Centennial Flyers, a reference flight school based at Centennial Airport (KAPA), signed a Letter of Intent (LOI) during H-55’s Colorado stop-over, becoming the first operator in the State to formally commit to adopting electric aviation. Their decision reflects the growing momentum across the US for the Bristell B23 Energic, which continues to attract interest from flight schools, pilot individuals, operators, and regional airports seeking sustainable and cost-efficient training solutions. This engagement further strengthens H55’s expanding order book and underscores the market’s readiness for certified electric aircraft.

Electric propulsion systems face heightened scrutiny when tested outside of controlled environments. In Colorado’s hot, high-altitude climate, H55’s certified Electric Propulsion System (EPS) excels, maintaining optimal performance despite the challenges posed by both elevated temperatures and reduced air density. The system delivered consistent climb rates and demonstrated efficient battery cooling, proving that electric flight can operate effectively in diverse climates and geographies year-round.

As electric aircraft join training fleets, climate resilient performance is essential. The B23 Energic offers zero emissions, low noise, and minimal vibration—ideal for flight schools and airports under stricter environmental rules. Colorado illustrated flawless performance in conditions that normally strain conventional aircraft. With no performance loss or system degradation, H55’s EPS proves electric propulsion is ready for high-altitude, high-temperature flight.

Next Stop: Oshkosh

Following the Colorado tour stop, the "Across USA Tour" continues with its seventh stop at "EAA AirVenture Oshkosh 2025" — “The World’s Greatest Aviation Celebration”. Attendees can learn more about the future of electric aviation at the 2025 Electric Aircraft Symposium (July 19-20), followed by the annual airshow (July 21-27) — a first for both H-55 and Bristell BRM AERO. 

H-55 is a Swiss-based company founded by the former Solar Impulse management team: André Borschberg, Sebastien Demont, and Gregory Blatt. Dedicated to revolutionizing the aviation industry, H-55 provides certified electric propulsion and battery management systems tailored to a diverse range of aircraft, aiming to achieve sustainable air travel. It supplies certified electric propulsion systems with full airplane integration solutions for general aviation and regional transport aircraft. Through its pioneering legacy and commitment to certified solutions, its team of engineers and aerospace experts are at the forefront of driving the aviation industry setting new standards and pushing the boundaries of electric aviation.