Mach 2 = 1,322.94 knots
5100.087 MPH 8207.795 KMPH 4431.885 Knots
Mach 0.89 or 950km/h or 512 knots
Mach 3, sounds good.728 knots
Knots or Mach for very fast ones
The maximum speed of the A380 is Mach 0.96 (634 mpg, 551 knots). max cruising speed = .85 MACH max design speed = .96 MACH
Subsonic means any speed below the speed of sound. (Mach 1). So subsonic aircraft range from 0 - 661 knots at sea level. (Mach 1 is 661 knots at sea level.)
Mach 0.80 (530 mph or 458 knots) at 35,000 ft.
Maximum speed: Mach 1.8 , (1,191 knots, 2,205 km/h)
Typical cruise speed is 470 knots (860KPH) or Mach 0.82
Knots is a measurement of speed. Horsepower is a measurement of power. To obtain that speed on water is probably not possible. To obtain that speed in air takes allot of horsepower. That is over Mach 2 (twice the speed of sound),
The Spirit Bomber flies at Mach 0.85 (487 knots, 560 mph, 900 km/h) when it is at an altitude of 40,000 ft.
Mach 2.