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sho69607

Knots/Mach Comparison

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I just was following this flight on FlightAware (BAW288) and it was showing 578kts @ 37000Ft isnt that something like M. 92 or higher? how could a 747 be cruising that fast. That is well over vMO for even an aircraft as fast as the 747. Was FlightAware displaying inaccurate data or am I converting this incorrectly?


~Spencer Hoefer

MOBO: Gigabye Aorus z590 elite | CPU: Intel i9-10900k  | RAM: GSKILL RIPJAWS 32GB DDR4 3200 |GPU: Nvidia RTX 2080Ti 11GBOS: Windows 10 

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That figure looks like your ground speed, not airspeed. And to get 578 kts would mean that you have a huge tailwind. Chris David

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so tailwind wont cause an overspeed. I must "knot" be understanding how GS works


~Spencer Hoefer

MOBO: Gigabye Aorus z590 elite | CPU: Intel i9-10900k  | RAM: GSKILL RIPJAWS 32GB DDR4 3200 |GPU: Nvidia RTX 2080Ti 11GBOS: Windows 10 

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Guest jahman
so tailwind wont cause an overspeed. I must "knot" be understanding how GS works
Overspeed is with respect to airspeed, not ground speed. According to Adacalc, 538 KN at FL380 is .938M for the Standard Atmosphere (ISA). Since the 744's Mmo is .92M or 527 KN (FL380, ISA), a mere tailwind component of 538 - 527 = 11 KN would do the trick! Cheers, - jahman.

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