Overview
- New reporting highlights Paul Crickmore’s account that during 1986 Libyan bomb‑damage assessment runs the SR-71’s inlet temperature ceiling rose from about 427°C to 450°C, allowing faster sprints and fueling pilot claims of speeds above Mach 3.4.
- Engineers limited speed by inlet temperature because unstable airflow near Mach 3.4 could reach the J58 compressor and cause flameouts, a risk documented across the jet’s career.
- The Blackbird lit hard‑to‑ignite JP‑7 fuel with triethylborane, a pyrophoric starter fluid stored in small, nitrogen‑inerted tanks that gave each engine about 16 metered shots and produced a brief green flash on ignition.
- Operating near 80,000 feet, SR-71 crews could scan roughly 100,000 square miles per hour and reported stars visible in daylight, with one pilot citing an observatory’s estimate of vastly greater star counts aloft.
- Lockheed’s jet remains the fastest crewed aircraft and reportedly outran more than 4,000 missiles, yet the Air Force retired it in 1990 over cost priorities as satellites and U‑2 upgrades took precedence.