Convert Mach 20 to Mach 5
Convert Mach 20 (Ma20) to Mach 5 (Ma5) instantly and accurately.
Conversion Formula
Ma5 = Ma20 × 4
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.
About Mach 5
Mach 5 ≈ 1,701.45 m/s (6,125 km/h) at ISA sea level - the conventional supersonic/hypersonic boundary. Above Mach 5, stagnation temperatures exceed 1,500°C, air dissociates around the vehicle, and ablative thermal protection becomes mandatory. Space Shuttle re-entered at Mach 25; Soyuz capsules at Mach 27; ICBM warheads at Mach 15-25. NASA X-43A scramjet reached Mach 9.6 (air-breathing record, 2004). 1 Mach 5 = 1,701.45 m/s.
Quick Reference Table
| Mach 20 (Ma20) | Mach 5 (Ma5) |
|---|---|
| 1 Ma20 | 4 Ma5 |
| 2 Ma20 | 8 Ma5 |
| 5 Ma20 | 20 Ma5 |
| 10 Ma20 | 40 Ma5 |
| 25 Ma20 | 100 Ma5 |
| 50 Ma20 | 200 Ma5 |
| 100 Ma20 | 400 Ma5 |