Not secret anymore? Mach 20 for an aircraft? Really?
Proof?
What’s it called? Where is it based?
(Anything based at Groom Lake is classified).
Recordings, official statements. . .news releases. . .where are those. . .
Technical reports defining CoG issues you talk about, where are those.
We’ve had hyper-sonic aircraft for a long time (X-15, for example).
I’d prefer a little more info if you have it.
Thanks.
Space.com has vid of prototype test.