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I'm sure they have tons. But we don't know the full thermo areo dynamics at hypersonic speeds and complex geometries, especially their effect on unconventional control surfaces across huge temperature and speed ranges. Some military companies have even bought flights on electron to get high altitude hypersonic velocity data on how the air behaves in that regime.
So rocket science...the thing the world has been doing since the end of WWII. Weird how other rockets don't have this problem....
You know of any other companies doing a belly flop maneuver? Or a reusable first stage with hot staging?
How reusable? NASA had recoverable boosters How does math and physics change based on goals?
NASA has never used hot staging.
I repeat math or physics changed?
No, the constants and dynamics in that flight regime are just not well understood.
So you are telling me PhD physicists don't know?
Yeah, broad strokes, but not super high fidelity stuff.
lmao people act like they can't comprehend that we haven't solved all physics yet