Convert Knots to Mach 20
Convert Knots (kn) to Mach 20 (Ma20) instantly and accurately.
Conversion Formula
Ma20 = kn × 7.558912170e-5
About Knots
A knot (kn) = 1 nautical mile per hour = 1,852/3,600 m/s ≈ 0.51444 m/s - the universal speed unit for aviation and maritime navigation (ICAO and IMO standard). GA aircraft cruise 100-140 kn; commercial airliners 450-480 kn; Concorde 1,176 kn (Mach 2). Container ships 18-22 kn; QM2 exceeds 30 kn. Beaufort Force 12 hurricane begins at 64 kn. Gulf Stream surface current 2-4 kn. 1 kn = 1.852 km/h = 1.15078 mph.
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
| Knots (kn) | Mach 20 (Ma20) |
|---|---|
| 1 kn | 7.559 × 10-5 Ma20 |
| 2 kn | 0.000151178 Ma20 |
| 5 kn | 0.000377946 Ma20 |
| 10 kn | 0.000755891 Ma20 |
| 25 kn | 0.00188973 Ma20 |
| 50 kn | 0.00377946 Ma20 |
| 100 kn | 0.00755891 Ma20 |