what is the regular airplane's speed limit? EX: United airline...etc?

Answer 1

Every airplane has a speed called the Vne, which stands for "velocity never to be exceeded," or simply "never-exceed speed." Letting the airplane exceed Vne is expected to cause irrecoverable structural damage.

The Vne for a Boeing 747-400 is 0.92 mach, which under standard conditions is about 600 knots. You would have to dive pretty seriously to get it up to that speed, and you would get all sorts of really scary noises and vibrations before you get there. So it's hard to do it accidentally, though it has been known to happen in extreme thunderstorms and the like.

That's a typical Vne for a multi-engine jet transport.

The 747's max cruise is about 510 knots, or 586 mph, though you would not do that very often. I've heard they fly Air Force One that way all the time, because the taxpayers are paying for the fuel.

Answer 2

To accurately answer your question you need to choose one plane that an airline, United in this case, might use. Since I am most familiar with the Boeing 757-200 (using Pratt & Whitney 2040 engines) we'll use this.

Once at cruise at an altitude of about 39,000 feet Mean Sea Level (MSL) you can expect to be cruising at a speed of Mach .80 or somewhere around 470 knots which equates to around 540 mph. This of course all depends on how heavy the plane is by way of passengers, fuel, seating configuration, engines, outside air temperature, wind, and power settings. But you can expect the above numbers on average.

As far as what the speeds are for other planes, well that depends on what it is that you've got flying. Hope that helped out.

Answer 3

around 500 knots. 600 to 650 mph

Answer 4

around 550 mph