When I inspected the SR71 at the Dallas Air and Space Museum I noticed that the intake spikes pointed down and inboard toward the fuselage centerline. I am aware that they are adjustable related to Mach speed (out for low Mach in for high Mach at first thought contrare but the pilot explained) for proper shock location and to prevent over pressure of the intake. But why the down and in orientation of the spikes. I am not aware of any adjustment for that spike orientation condition and noticed after. Perhaps total fuselage airflow affects the spike shock that requires that orientation?
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