ELECTRICFLIGHTISN'TJUSTCLEAN-IT'SCLIMATERESILIENT,SUITABLE FORALL TYPES OF ENVIRONMENTS
H55, 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 USATour. These tests confirm the real-world performance of the H55-powered Bristell B23Energic,illustratingthe operational performance of electric aviation.
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Operating in Challenging Conditions
The Colorado mission flights took place from an airfield situated at 5,800 feet above sea level, with temperatures reaching 36degreeC (96.8degreeF) 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.
“Colorado offers one of the most demanding environments for aviation,”said Gregory Blatt, Co- Founder and Mission Director of H55. “This stop gives us a chance to demonstrate how electric propulsion is not only sustainable, but operationally consistent in conditions previously considered restrictive for many aircraft types. We're especially grateful to Centennial Airport and jetCentersof Colorado for their warm welcome and support.Their commitment to innovation and sustainability reflects the shared mission of accelerating the adoption of clean aviation solutions.”
A First for Colorado
CentennialFlyers,aleadingflightschoolbasedatCentennialAirport(KAPA),signedaLetterofIntent (LOI) during H55'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 U.S.for the BristellB23Energic,whichcontinuestoattractinterest fromflightschools, pilotindividuals,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.
Proving Electric Flight in Real Environmental Settings
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.
KeyQuestionsAnsweredinColorado
— Can electric aircraft operate effectively at high-density altitudes?
Yes-the B23Energic performedinconditionsof36degreeC(96.8degreeF) anda9,500ftdensity altitudewith stability and strong climb rates, at 500 feet per minute.
— How does heat affect electric propulsion?
H55'sbatteryandEPSarchitectureperformedwithinnominal thermallimits,withnosigns of degradation despite high ambient temperatures, up to 40degreeC (104degreeF).
Advancing Climate Resilient Flight Training
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 AirVentureOshkosh2025 – '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 annualairshow(July21-27) -afirstforbothH55andBristellBRM AERO.A Bristell/H55 press conferencewill be held onTuesday, July 22 at 11:00 AM CST at Booths 296-297.
For Press Images and Interview Requests
Downloadthemedia kitUSMediacontact:Tamar BurtonItamar.burton@h55.ch
About H55
H55 is a Swiss-based company founded by the former Solar Impulse management team:André Borschberg,SebastienDemont, andGregoryBlatt. Dedicatedtorevolutionizingtheaviationindustry, H55 provides certified electric propulsion and battery management systems tailored to a diverse range of aircraft, aiming to achieve sustainable air travel.H55 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, H55's team of visionary engineers andaerospaceexperts areattheforefrontofdrivingtheaviationindustry settingnew standards and pushing the boundaries of electric aviation.
For more information, visit: www.h55.ch or contact press@h55.ch
Media Contact
tamar.burton@h55.chwww.h55.ch
www.h55.chH55 SARoutedel'Aéroport10 1950 SionSwitzerland
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