# Fuel consumption and speed

Hi,

Is the speed of the a/c taken into consideration when is coming about fuel

consumption? Is a plane flying with 500km/h going to consume less fuel

than a plane flying with 600km/h (providing that ALL the other factors are

equal)?

Thank you!

You can’t choose the speed, an aircraft will operate a flight

Also, as I explained before on another post, there would be no advantage in reducing speed as this would save a few dollars in fuel but cost more in maintenance, crew, utilisation etc.

I wasn’t speaking about choosing the speed but about the speeds of

two different planes… If one has 500 and the other 600 will this be taken

into consideration when is coming about fuel consumption?

Thank you!

You have some very weird questions…

Just open the page containing details of a given aircraft, click on “Goto performance check tool…”, enter IATA codes, click “Submit…” and you’ll see how much fuel your aircraft needs on that route. Do the same thing with different aircraft and compare the results. End of story…

Every plane has got its specific performance data (this is currently being worked on,as it is not really realistic) and the fuel consumption is calculated for each flight. It does not change with load and as there is no weather simulated, it is the same for each and every flight.

You can see how much fuel your plane will need on a specific flight by using the performance tool (link highlighted in red) to be found on the aircraft page.

EDIT: I guess the Giraffe was quicker this time

Hey guys,

Finding how much fuel a plane consumes wasn’t my issue… I already knew how to do that.

My question was regarding the parameters which are taken into account (like MTOW, distance

etc.) when calculating the a/c speed (and yes, I know that we don’t have to do it by ourselves,

the performance tool does it for us).

Nirod

Ok, while I’m not sure what you want to know exactly (lost in translation perhaps?) I’ll say the following hoping it gives some of the info your looking for.

AS operates predominantly in fixed (simplified) values. This means for a given aircraft on a given route you’ll always have the same speed, fuel burn and other associated costs.

The only thing that changes is maximum load, this may be reduced by restrictions in take off or landing distance or because of route length (I don’t believe theres a MLM that’s taken into account although this isn’t normally a problem anyway)

Perhaps you can clarify why you might think the speed changes? Don’t forget you need to factor turn around time at airports into the equation which is dependent on things like a/c type and airport size

Hi Nirod,

real planes burn fuel per hour. And the fuel they burn depends on speed, altitude, payload, weight of the fuel in the plane, ATC instructions and so on. They also burn less fuel as they become lighter during flight.

AS has to keep it simple. The game does not care about prevailing winds, half empty planes, or only taking as much fuel as you need for a short flight.

AS uses the known specifications of a plane and translates this into fuel consumption over a given distance

• per cycle (take-off and climb to altitude)

• per kilometer (distance between two airports)

The popular Dash 400 A for example needs 650 liter per flight plus 1.26 liter per kilometer (if distance is within the normal range of the plane).

If you fly 100 km, you will burn 650+126 liter.

If you fly 1000 km, you will burn 650 + 1260 liter.

Jan

Captain,

the a/c fuel consumption. In other words, is a plane going to need more fuel because he flies

faster (providing that [size="3"]all [/size]the other conditions are the [size="3"]same[/size])?

As you can see in the a/c info page, there is nothing regarding fuel consumption. But there are

some factors which you take into account when you try to estimate (without using the performance

tool) the fuel consumption (MTOW and the range). What I needed to know is if we need to take into

account also the speed of the specific plane.

Jan,

How can you find out how much fuel it needs per cycle and per km? How did you know that

Thank you!

cycle: take the performance tool and enter the same airport as origin and destination.

Kilometer: tate the performance tool. Enter two different codes. Subtract the cycle value from the used fuel. Divide this value by the flown Kilometers. done. (e.g. (1248-650)/501≈1.27)

Nice!!!

Ok now I understand, in theory the bigger the plane and the faster the speed the higher the fuel burn. Remember the aircraft type evaluation tool will let you compare aircraft of different sizes and speeds and give you an estimated income and fuel burn and other costs.

Honestly your much better off using some of the invaluable tools at your disposal rather than trying to guess how much fuel a plane will burn. Further I think some common sense is required. As much as people here are keen to help those who want pointing in the right direction there is a point when, with a bit of thought, you can answer your own question.

Ok now I understand, in theory the bigger the plane and the faster the speed the higher the fuel burn. Remember the aircraft type evaluation tool will let you compare aircraft of different sizes and speeds and give you an estimated income and fuel burn and other costs.

Honestly your much better off using some of the invaluable tools at your disposal rather than trying to guess how much fuel a plane will burn. Further I think some common sense is required. As much as people here are keen to help those who want pointing in the right direction there is a point when, with a bit of thought, you can answer your own question.

Haha Daniel, you are smarter than me…

When I noticed that the same plane was more fuel efficient on one route than on another route, I used the performance tool to check the fuel consumption for two routes. Then I used my old school algebra to solve an equation with one unknown factor. I did not think about checking the fuel consumption between airport A and airport A

And it is handy to know that a plane in your fleet is very expensive on short domestic routes because the "cycle" consumption is very high. Just like it is handy to know that a plane may appear to be expensive because it can only perform one daily return flight (while in reality everybody would add a second, shorter, flight to the flight schedule). If you don’t realise these things, you discard a plane for all routes because it scored badly on one route. Or you have to use the evaluation tool for every single route.

Besides, some people are curious and like to know how things work. If there is a problem with Nirods questions, it’s only that he wants to know everything at the same time

Jan