Hypersonic wind tunnel puts China years ahead in missile race

[safetypee]

gamecock, even earlier; Halton 1959-62.

Used high pressure air cylinder venting though a pipe with a small clear-view section. Backlit ‘Schlieren’ projection to view test section - an old safety razor blade because the sharp leading edge replicated a supersonic wing section.
Estimated M1.3+ from the shock angle.