4 ms·
Boom Supersonic aims to fly 'anywhere in the world in four hours for $100'
- Gravityloss 5y ago20,000 km / 4 h = 5000 km/h so Mach 5. Not realistic in my opinion. It's at the upper end of supersonic before hypersonics. The flow can still be slowed down to subsonic for combustion. The ASALM cruise missile prototype reached these kind of speeds. http://designation-systems.net/dusrm/app4/asalm.html http://designation-systems.net/dusrm/app4/asalm.html