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First flightapprovedJuly 22, 2025
Castelion

Castelion first hypersonic test vehicle flight

Castelion completes first test flight of its long-range strike vehicle, validating propulsion and guidance at hypersonic speeds.

Castelion's first test vehicle flew from a west coast range, reaching hypersonic speeds and demonstrating the company's rapid-iteration approach to long-range strike. The vehicle, designed to be produced at aerospace-startup cost and cadence, cleared key propulsion and guidance milestones on its maiden flight.

Headline metrics

Max speedMach 5+
RangeClassified
Vehicle cost~$1M

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