Simviation Forums

I started a flight with a twin engine cargo plane. On average it moves about 260 knots. I also started a flight in an AN124 which have four jet engines, (not to mention it's a monster).

Well for starters if you started your flying (Sim) career where it should have (Cessna 152/172) you would understand the difference between IAS and TAS.

TAS, True Air Speed, is the speed you would move forward at if your were on the ground.

IAS, Indicated Air Speed, the atmosphere consists of layers, these layers have various density levels. The higher you fly the lesser the density.

That means the dense air moving through the pitot tube is less high in the air then low on the ground.

Which means your speed indicator tells you, you are flying 325 knots IAS but your TAS is well above that, therefor you get the overspeed warning.

As for the time issue. Using real weather could result in weather patterns like head-winds causing one flight to be slower then the other.

You must also understand, with big birds your time planned to climb and decent adds to the total flight plan.

Some ppl climb at full throttle, all aircraft must be set in certain configs. in all parts of the flight pattern.

The cargo plane likely takes much quicker to climb in the prescribed confiq. and can level off quicker and adjust to cruise speed then that of a heavy.

Many factors to be taken into consideration.

Mouse

The ETE displayed on the GPS is calculated in real time, and is the ETE for the remainder of the leg from your current position. It is not the total ETE for the entire flight or leg.

Current remaining DIS / current GS = ETE

It has little meaning, in your context, until you have reached your cruise speed.

To see an

Thanks for your replies! I now have a better understanding.