8 replies to this topic

[davistev]

I am confused.

 

Two planes.

 

BAE 146-200 : Fuel Flow Rate: 11,375

Fokker F28: Fuel Flow Rate: 14,850

 

However, the 146 has 4 engines and the little Fokker has 2 engines

 

Is the Fuel Flow Rate per aircraft or per engine? 

[Marb1]

Per engine. So don't think a A340 is more efficient than a 777! (Wait, that's wrong!)

[Jezza.]

Per engine. So don't think a A340 is more efficient than a 777!

If that were even slightly true, the 747, A380, DC-8, or pretty much any 4 engined aircraft (or 3 engined for this case) would be WILDLY unprofitable, and I mean it would be absolutely atrocious...and I know for a fact it isn't. Although it would be interesting to know what units of measurement the fuel flow is calculated in.

 

Also, to answer your question, the F-28 has low-bypass turbofans and while the BAE 146 may have 4 engines, it has high-bypass turbofans, and it's also has 15-20 years (if not more) of engine developments over the old Rolls Royce Speys

[Marb1]

If that were even slightly true, the 747, A380, DC-8, or pretty much any 4 engined aircraft (or 3 engined for this case) would be WILDLY unprofitable, and I mean it would be absolutely atrocious...and I know for a fact it isn't. Although it would be interesting to know what units of measurement the fuel flow is calculated in.

 

Also, to answer your question, the F-28 has low-bypass turbofans and while the BAE 146 may have 4 engines, it has high-bypass turbofans, and it's also has 15-20 years (if not more) of engine developments over the old Rolls Royce Speys

Oh!

[Pacific]

It's total fuel flow, not per engine. See how the A343 burns less fuel than the A333 in the game (through Fuel Cost).

 

 

$160,338 / $159,214= 1.007

A330-300's fuel cost is 0.7% greater than A340-300

 

According to aircraft data:

 

A340-300 with 4 CFM International (GE Snecma) CFM56-5C2

Fuel Flow: 37,939 (with winglets)

 

A330-300 with 2 Rolls-Royce Trent 768

Fuel Flow: 38,475 (with winglets)

 

38,475 / 37,939 = 1.014

A330-300 has 1.4% higher fuel flow!!?

 

Something is seriously up with AE here and the 4 knot speed advantage to the A333 does not explain this. However the fuel flow is still, definitely not per engine.

[Marb1]

It's total fuel flow, not per engine. See how the A343 burns less fuel than the A333 in the game (through Fuel Cost).

 

 

$160,338 / $159,214= 1.007

A330-300's fuel cost is 0.7% greater than A340-300

 

According to aircraft data:

 

A340-300 with 4 CFM International (GE Snecma) CFM56-5C2

Fuel Flow: 37,939 (with winglets)

 

A330-300 with 2 Rolls-Royce Trent 768

Fuel Flow: 38,475 (with winglets)

 

38,475 / 37,939 = 1.014

A330-300 has 1.4% higher fuel flow!!?

 

Something is seriously up with AE here and the 4 knot speed advantage to the A333 does not explain this. However the fuel flow is still, definitely not per engine.

Darn. I was wrong.

[davistev]

Thank you. It is per aircraft then. That makes a comparison easier with the data given.

[Pacific]

IIRC fuel flow in AE is done through an algorithm. While I have no details on how it works, it seems to have some relationship with installed thrust.

The A343 has less total thrust than an A333 therefore has the better fuel efficiency in-game.

Of course that's nonsense in the real world but such is the limitation of a free game developed during the free time of a person with a full-time job.

[Marb1]

IIRC fuel flow in AE is done through an algorithm. While I have no details on how it works, it seems to have some relationship with installed thrust.

The A343 has less total thrust than an A333 therefore has the better fuel efficiency in-game.

Of course that's nonsense in the real world but such is the limitation of a free game developed during the free time of a person with a full-time job.