Actually the Raptor DOES have some limited variation in the inlet system, but not near the intakes. There are no moving ramps or doors in the inlet
system except pressure relief doors near the engines themselves that are on top of the airframe. There are boundry layer screens inside the intake
but that's all there is.
On the Blackbird the normal cruising speed was Mach 3.17, 3.2 high cruise and under permission from the ground M3.3. An A-12 did Mach 3.5 in testing
for a few mins and was lucky to land as it crisped its wiring and had only a quart of hydraulic fluid left in the system or something. The Mach 4-7
claims are utterly bogus.




