Convert Miles per Minute to Mach 20
Convert Miles per Minute (mi/min) to Mach 20 (Ma20) instantly and accurately.
Conversion Formula
Ma20 = mi/min × 0.003941109054
About Miles per Minute
A mile per minute (mi/min) = exactly 26.8224 m/s = 60 mph. The X-15 rocket plane flew at ~4.5 mi/min (Mach 6.7); the SR-71 Blackbird at ~2.1 mi/min (Mach 3.2). Speed of sound at sea level ≈ 0.77 mi/min. 'Mile-a-minute' (60 mph = 1 mi/min) was a historic railway milestone first achieved on the Great Western Railway in the 1840s. 1 mi/min = 96.5604 km/h.
About Mach 20
Mach 20 ≈ 6,805.8 m/s (24,501 km/h) at ISA sea level - the peak heating regime of ballistic re-entry. Shock layer temperature exceeds 10,000 K; plasma sheath causes radio blackout. Space Shuttle decelerated through Mach 20 at ~75-80 km altitude; Apollo CM hit the atmosphere at ~Mach 36; ICBM warheads re-enter at Mach 18-24. DARPA HTV-2 reached Mach 20 in 2011. 1 Mach 20 = 6,805.8 m/s.
Quick Reference Table
| Miles per Minute (mi/min) | Mach 20 (Ma20) |
|---|---|
| 1 mi/min | 0.00394111 Ma20 |
| 2 mi/min | 0.00788222 Ma20 |
| 5 mi/min | 0.0197055 Ma20 |
| 10 mi/min | 0.0394111 Ma20 |
| 25 mi/min | 0.0985277 Ma20 |
| 50 mi/min | 0.197055 Ma20 |
| 100 mi/min | 0.394111 Ma20 |