H55’s electric aircraft flies so quiet, that during a noise measurement test, the Bristell B23 Energic powered by H55 propulsion system was so quiet that the electric aircraft flew without triggering three of six official noise-monitoring sensors.
On 11 July 2025, the B23 Energic flew identical flight paths alongside a comparable piston-engine across the airport’s six official noise-monitoring stations:
“Electric aviation isn’t the future—it’s here,” said Michael Fronapfel, CEO of Centennial Airport. “The B23 Energic offers noise levels so low, they’re almost too quiet to track. This has real-world implications for airport communities. It’s a level of performance we’ve never seen before in general aviation.”
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“Across multiple flights, the B23 Energic consistently came in 30 times quieter than similar aircraft during cruise,” said Zach Gabehart, Centennial Airport’s Noise & Environmental Specialist. “If this keeps up, I might be out of a job.”
Electric propulsion isn’t just fuel-free—it’s neighbor-friendly, regulator-approved, and airport-operator- loved. With the B23 Energic, airports and flight schools can now enjoy:
Certified Technology, Real-World Benefits
“This test proves that electric aviation delivers not just environmental benefits, but tangible advantages for the communities around airports,” said Martin Larose, CEO of H55. “We’re proud to offer a certified propulsion system that helps make aviation more affordable, more sustainable, and more silent.”
