24 replies to this topic

[kaarlows]

I've made a spreadsheat myself and I agree on it's being easy on the point of using, but I took at least 1 hour manually adding data from the aircrafts. And that's choosing to add with only 1 engine option…

[mxax-ai]

So is the fuel flow shown in the aircraft details the total fuel flow or the fuel flow per engine?
Because if it is the fuel flow per engine, it makes the numbers rather hard to compare.

[kaarlows]

Fuel flow is for the entire plane, not per engine.

It doesn't seem to be for the entire plane. I quote this part:

AE does this calculation:
(Total Fuel Flow) = (Engine Thrust) * [TSFC] * (Number of Engines)
which is:
(Total Fuel Flow) = (Engine Thrust) * [(Fuel Flow) / (Engine Thrust)] * (Number of Engines)
which cancels down:
(Total Fuel Flow) = (Fuel Flow) * (Number of Engines)
which suffices as an approximation for now

[BritAbroad]

As I previously posted here and as Fox points out, fuel flow listed is the total amount for the aircraft, not the amount per engine.
The maths quoted a couple of posts above explains the calculations that AE does, in order to come up with the value listed.


I hope this helps.

BA

[kaarlows]

Thank you, it helped a lot!

And now I have to sincerely reconsider all my A340 fleet, as I was phasing it out but it turns out to be the best deal.