747

I think its about 0.90 mach.

The max cruising speed I believe is 0.91 mach, but most commercial 747's cruise at around 0.85 - 0.88 mach. The max speed in KIAS depends on your altitude. At average cruising altitude, the KIAS should not be higher than 240 -260, again, depending on altitude 😉

535 KIAS is way too fast for any altitude 😕

😉

so if it is too fast then why does it not show the overspeed sign?
hmmmm now i am confused! and i am flying at FL350. i am running FSP and had 100% fuel at the start and do not have enoght to complete the flight i want to do.
i thought it was faster than 535 but then again im just at ammateur.

You could be talking about miles per hour, but at FL350, the aircraft cannot travel at more than 320 KIAS without structural damage. The fact that it isn't showing the overspeed sign means that you aren't going at that speed in KIAS. At around FL280, change the autopilot speed setting to MACH instead of IAS and set it to 0.85-0.88 mach 😉

Good luck 👍

What's the conversion for mach to KIAS?

I'm not too sure about this, but I don't think that a simple conversion from Mach to KIAS exists, because knots indicated airspeed changes with altitude and weather conditions, but Mach 1.0 = 661.470 842 333 knot Someone may correct me on the above though 😕

➡ http://www.onlineconversion.com/speed_common.htm

Have a look at that 😉

You should probably read up on the learning center a bit more. And if you're an amature, (pardon the spelliing 😛) maybe take the flying lessons as well as a starter, then move on to bigger jets.

rickypig112 wrote:

so if it is too fast then why does it not show the overspeed sign?
hmmmm now i am confused! and i am flying at FL350. i am running FSP and had 100% fuel at the start and do not have enoght to complete the flight i want to do.
i thought it was faster than 535 but then again im just at ammateur.

It could be your looking at your GS (ground speed) on your GPS. Or you may have the box in the realism settings that says "Allow stress to cause damage" unchecked
😕

rickypig112 wrote:

i am running FSP and had 100% fuel at the start and do not have enoght to complete the flight i want to do.

If you don't have enough fuel, try lightening the payload by just a bit. Most long hauls have luggage weight limits to ensure the plane isn't overloaded and that it can carry the fuel it needs to reach its destination. Also, keep in mind, carrying a fully tank of fuel is (in a way) shooting yourself in the foot. The heavier you are, the more fuel you burn. So if you carry too little fuel, yes you will burn it slower, but probably end up in the ocean. Its the same if you carry too much, you burn it much FASTER, and could still theoretically end up in the ocean 😉 .

99jolegg wrote:

I'm not too sure about this, but I don't think that a simple conversion from Mach to KIAS exists, because knots indicated airspeed changes with altitude and weather conditions, but Mach 1.0 = 661.470 842 333 knot Someone may correct me on the above though 😕

➡ http://www.onlineconversion.com/speed_common.htm

Have a look at that 😉

Ok, according to that 0.91 mach (which someone said was the max cruising speed of the 744) is 601 knots! I'm guessing there's no way it could be this high. It also says 0.85 mach is 562 knots, which equally seems far too high for a standard cruising speed.

Anyone clear to clarify? Thanks a lot...

on flight simulatory is says the max speed is .88 mach. is that right?

JTH wrote:

Ok, according to that 0.91 mach (which someone said was the max cruising speed of the 744) is 601 knots! I'm guessing there's no way it could be this high. It also says 0.85 mach is 562 knots, which equally seems far too high for a standard cruising speed.

Anyone clear to clarify? Thanks a lot...

I may have got the max speed wrong, but it is fairly close - between 0.88 and 0.91. You have to remember that the conversion is for ground level. When you are high up, the KIAS is lower because the air pressure is lower so the pressure exerted on the pitot tube (which measures speed) is a lot lower, so KIAS will show around 240-260 knots at FL340-FL380. You are probably best off ignoring that conversion site I gave in terms of mach and knots, because it isn't knots indicated air speed, rather knots that you could do in a car or ship, so if you were to go mach 0.85, you would need to drive at 562 knots which is 646 miles per hour and 1040 kilometres per hour. At FL350, it is a lot different 😉

In the Boeing 747-400, the (Vmo) Maximum operating speed is 355 KIAS. The (Mmo) Maximum operating speed Mach is .88. Mach is the aircrafts speed compared to the speed of sound. The speed of sound varies with temperature. At FL350 the standard temperature is -55 degrees Celsius. Mach .88 would be 506 (KTAS) Knots True Airspeed. Indicated airspeed would be 302 (KIAS) Knots Indicated Airspeed-on airspeed indicator not GPS. If you exceed these speeds in the real aircraft or in a more sophisticated simulation, you will get a over speed warning. The default 747 within Flight Simulator does not give all proper over speed warnings. Normal cruising speed would be about .85-.80 Mach. The lower speeds will give you more range because of lower fuel burn.

To convert nautical miles (knots) to statue miles (MPH), multiply knots X 1.150779. 🙂

The actual speed of sound varies depending on the altitude above sea level because sound travels at slightly different speeds at different temperatures, and the temperature varies according to altitude. At sea level, the speed of sound is about 761 miles per hour (1,225 kilometers per hour). At 20,000 feet (6,096 meters), the speed of sound is 660 miles per hour (1,062 kilometers per hour).

If an aircraft is traveling at one half the speed of sound, it is said to be traveling at Mach 0.5. A speed of Mach 2 is twice the speed of sound. Because the speed of sound varies, a particular speed at sea level expressed as a Mach number would be faster than the same speed at 30,000 feet (9,144 meters), which would be faster than the same speed at 40,000 feet (12,192 meters). In other words, Mach 2 at sea level is a greater number of miles per hour (or kilometers per hour) than Mach 2 at 30,000 feet, which is a greater number of miles per hour than Mach 2 at 40,000 feet. When an aircraft reaches Mach 1, it is said to "break the sound barrier."