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Why is a 747-300 less fuel efficient than a 747-400?


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#1
creeperkiller

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I rarely post here so I am not the smartest XD

 

anyways I was testing out whether a 747-400 would be worse than a 747-300 and turns out I was wrong. I am not sure why. For both aircraft I chose engines that had the least amount of fuel used (circled in red). For a 747-400 it has a slightly higher fuel consumption than the -300 but has better economics. Any reason why? Sorry if it is a dumb question.

 

 

Attached File  AE 747300.PNG   381.24KB   0 downloads

Attached File  AE 747400.PNG   425.9KB   0 downloads

 

Now yes it is obv on what is the seat config so I uploaded that. It's almost the same with the difference being the 747-400 has first class seats and the 747-300 doesn't and has an extra 10 more seats in economy

 

Attached File  AE 747 cost.PNG   277.79KB   0 downloads



#2
Betty Marilyn Smith

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Did you check the engine you used when buying the aircraft? Also, the speed affects the fuel economy. Let’s say two different aircraft have the same fuel flow but one is faster. The faster one will be more fuel efficient. Age of aircraft affects fuel economy too.

#3
Betty Marilyn Smith

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Seats do not affect if I’m not wrong.

#4
KJS607

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The B744 flies faster than the B743, so, if the fuel consumption was identical on both, for example, you will use less fuel on the B744 as it spends less time in the air. As a result, despite the B744 having a slightly higher SFC, it's more economical in operation.


2m5cohz.png


#5
creeperkiller

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Did you check the engine you used when buying the aircraft? Also, the speed affects the fuel economy. Let’s say two different aircraft have the same fuel flow but one is faster. The faster one will be more fuel efficient. Age of aircraft affects fuel economy too.

The engine for the 747-300 is Rolls Royce RB-211 524D4-B

on the 747-400 it's the same however instead of D4-B it's a 524G (In this case a RB 211-524G) 

The B744 flies faster than the B743, so, if the fuel consumption was identical on both, for example, you will use less fuel on the B744 as it spends less time in the air. As a result, despite the B744 having a slightly higher SFC, it's more economical in operation.

So theoretically an aircraft that is faster would use less fuel in some cases, if not a lot? 



#6
KJS607

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So theoretically an aircraft that is faster would use less fuel in some cases, if not a lot? 

 

Correct


2m5cohz.png


#7
creeperkiller

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Correct

Ah sweet thanks.

 

You said something about the age of an aircraft that affects fuel economy, what does that do? 






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