pub const BUILDUP_MACH_LIMIT: f64 = 5.0;Expand description
The top of the buildup’s range, which it doesn’t reach: Mach 5, where the hypersonic region
begins (Niskanen 2009 Table 3.1, p. 19), as for the normal force. Niskanen expects the
simulation “to be reasonably accurate to at least Mach 1.5” (p. 94); how far it holds against
measurements is in docs/physics/aero.md.