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 speed | Mach 5+ | |
| Range | Classified | |
| Vehicle cost | ~$1M |
Highlights
- First flightMaiden flight of Castelion test article.
- Fast iterationFirst flight under 2 years from founding.
Resources
- Castelion first flightcastelion.com