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Aircraft Fuel Flow


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#1
Jarkii

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I'm aware that in Real life, the boeing 777 is more fuel efficient than the A340. However, the fuel flow (per seat) for the 777 in AE is higher than the A340s. I heard that AE uses the takeoff fuel flow in it's figures, which is probably why. Why is that? Will this be changed in AE 4?(if that ever happens)



#2
KJS607

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AE4

 

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#3
Supreme_Leader

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The engines specification page shows fuel flow for one engine.

Remember the A340 has 4 engines so for comparison.

777-300er 59495x2 = 119590 (GE 115b)

A340-600 62720x4 = 250880

 

The 777-300er has more seats (550) than the A340-600 (475) in AE so naturally would have better fuel economy per seat

 

Comparing the 777-200er against the A340-300

777-200er (GE90-85B)  48150x2 = 96300

                 (PW4090)      54119x2= 108238

A340-300 (CFM56-5C2) 39936x4=159744

They both have the same capacity of 440 seats



#4
Tower777

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Is it true that the engine specification page shows fuel flow for one engine?

I've heard about that.

Thanks!

#5
Pacific

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It's most definitely not for 1 engine. It's the total fuel flow of all engines.

 

A330-300 (Trent 768) vs A340-300 (CFM56-5C2) in total fuel burn (look at fuel cost).

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#6
KJS607

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Is it true that the engine specification page shows fuel flow for one engine?

I've heard about that.

Thanks!

Incorrect.


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#7
Supreme_Leader

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Incorrect.

 

Well it is correct that the engine specifications are for 1 engines. What isn't correct is that AE calculates fuel through that one engine instead of 2 or 4

 

Looking at CFM's PDF, they specify the thrust of 1 engine which is correct with AE's data

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#8
Jarkii

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Well it is correct that the engine specifications are for 1 engines. What isn't correct is that AE calculates fuel through that one engine instead of 2 or 4

 

Looking at CFM's PDF, they specify the thrust of 1 engine which is correct with AE's data

So your saying that the A340's fuel flow is 4x greater in reality, and A330s, 777s are double?



#9
KJS607

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Well it is correct that the engine specifications are for 1 engines. What isn't correct is that AE calculates fuel through that one engine instead of 2 or 4

 

Looking at CFM's PDF, they specify the thrust of 1 engine which is correct with AE's data

 

What I'm saying is the FF data is a total of all engines, so you can get a good idea of the fuel usage to more easily compare it with other aircraft, although the remaining data is per engine.


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#10
atnt71eb

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Fuel flows are for all engines. 

 

Fuel flows are also way off from reality. The game calculates flow based on (1) takeoff specific fuel consumption and (2) max takeoff thrust. The real calculation would be by (1) cruise specific fuel consumption and (2) cruise thrust. In order to find cruise thrust you'd have to know the lift to drag ratio of the plane and its weight. You'd want to have different fuel flows for different mission lengths. 

 

That's probably not possible but it should be at least possible to get a better approximation than the one we have. We should be going off of average fuel burn over max mission, for example - data that is available for all in-service planes through manuals. 



#11
KJS607

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AE isn't in active development. Hasn't been for years.


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