SION, Switzerland, DENVER and HAMPTONS, N.Y., July 31, 2025/ PRNewswire/– H55’s electrical airplane flies so peaceful, that throughout a sound measurement test, the Bristell B23 Energic powered by H55 propulsion system was so peaceful that the electrical airplane flew without setting off 3 of 6 main noise-monitoring sensing units.
On 11 July 2025, the B23 Energic flew similar flight courses together with a similar piston-engine throughout the airport’s 6 main noise-monitoring stations:
- 3 of 6 sensing units tape-recorded no airplane sound– the B23 flew listed below ambient sound limits (60 dB)
- The staying sensing units signed up the …
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