While there is general acceptance of the trend toward more-electric aircraft, few can predict the near- or even mid-term debut of electrically propelled vehicles, let alone one that could be capable of Mach 4-plus. There is no surprise, therefore, that a hybrid-electric supersonic business jet project revealed last year by HyperMach for service entry in the early 2020s is attracting more than its fair share of interest. The concept not only challenges conventional airframe design ...

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