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Questions tagged [fuel-consumption]

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2answers
119 views

How long will an aircraft need to fly before it can land without dumping fuel? [closed]

Now, I know perfectly well that the literal and unhelpful answer to the question is long enough to burn sufficient fuel that it is no longer overweight for landing. What I'd like to understand is ...
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2answers
64 views

Is the route which takes the least time always the one with least fuel-burn?

Geographically longer paths may require less fuel than the shortest (great circle) path. But what about time ? Is the most fuel efficient route always the one that has the aircraft in the air for ...
3
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4answers
243 views

Can longer paths consume less fuel than the (shorter) great circle path?

Is the most fuel-efficient route between points A and B always along a great circle ? Although somewhat counter-intuitive, this comment on an aviation blog seems to suggest that longer paths (in ...
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0answers
30 views

what would couse uneven fuel levels in a cessna 207? [duplicate]

I have problems whit the level in each tank after a flight of 3 hours. I usually use the right tank the first hour and then I change to the opposite, but when I check the level after that the rigt ...
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1answer
165 views

Does preheating fuel before it reaches the turbine result in a performance improvement?

Preheating fuel before it reaches the combustion stage was first proposed several decades ago as a way to improve mixture, fuel economy, and to reduce emissions in car engines. One example of this ...
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0answers
26 views

How much fuel does an airliner consume at various stages of operation? [duplicate]

I used to think that almost all of an airliner's fuel consumption was during actual flight; but it seems that even while on the tarmac or at a gate it consumes a non-negligible amount. So, in general ...
0
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1answer
219 views

What is fuel consumption of an A330 during climb and descent?

I want to know how to calculate or estimate an aircraft's fuel consumption when climbing from sea level to 15,000 ft, followed by a descent to 10,000 ft. I would like to see an example for an Airbus ...
6
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2answers
468 views

What passenger airplane has the lowest fuel efficiency?

What is the airplane with the lowest fuel efficiency? To set some parameters, let's limit it to the following: Must be manufactured between 1960 and modern day. Must be a non-military passenger ...
2
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2answers
132 views

What is the 'fuel cost' of a pneumatic braking system vs. a hydraulic one, in terms of weight?

A pneumatic braking system has indisputable advantages over a hydraulic braking system for large and heavy aircraft in terms of braking force and secondary perhaps in terms of weight (pipes and ...
3
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2answers
177 views

How to compare two SFCs, one in thrust, the other in power (both turbofans)?

I want to compare some recent turbofan engines in terms of fuel efficiency, particularly the PW535A and FJ44-4. I found the SFC for the PW535A to be 0.44 lb/h/lbf. I couldn't find anything on the ...
6
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2answers
218 views

Can quadcopters save energy by flying in formation?

If two or more quadcopters are aligned, would the effect of drag due to the lead quadcopter's slipstream lead to measurable energy savings? And if so, how would one determine the optimal distance ...
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7answers
788 views

Is it possible to fly 'in neutral'?

Sometimes, when I am driving, I knock the car 'out of gear' or set the stick to the neutral position, to save fuel. This is most easily done when cruising down a hill or when you have some good speed ...
1
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1answer
235 views

What is the fuel mass flow rate at stationary full power for the CFM56 5C2/3C1 engines?

Does anyone know what is the value of fuel mass flow rate when stationary at full power for CFM56-5C2 or CFM65-3C1 turbofan engines? I am doing a work on engine performance and it seems that only ...
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0answers
76 views

Would this be an accurate method of fuel consumption comparison?

I'm looking to compare the fuel consumption of regional jets in the US and the stated efficiency of the Bombardier CS100. At the moment, I'm considering using data from the Bureau of Transportation ...
1
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1answer
89 views

What are the conditions for the percentage power vs fuel consumption figures in the engine operator manual?

For the Lycoming O-160-A4A, the operator manual says in Economy Cruise, which is 75% Rated power and 2450 RPM, the engine produces 135 HP and burns 9.5 GPH. How were these figures determined? Were ...
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2answers
146 views

On SEP airplanes, why does the fuel consumption decreases with temperature, pressure and airspeed being equal?

Looking at the cruise performance tables in the POH of the C150, C172 or C182, one can see that for the same pressure altitude, the same RPM and the same true airspeed, the fuel consumption is reduced ...
10
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2answers
1k views

How much fuel is burned to carry the trip fuel?

For rockets, there is a rule of thumb that says for each kilo of fuel put into orbit, 7 kilos is needed to get it there. For long and ultra-long flights, it feels intuitive that some very significant ...
5
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1answer
386 views

What makes the loss of a flap track fairing strongly increase fuel consumption on Airbus planes?

Inspired from this question about the loss of a flap track fairing. In the answer by Thunderstrike, a part of the configuration deviation list of an Airbus A320 is linked. In it, it says: One ...
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1answer
180 views

How to model aircraft fuel consumption during the approach?

I am trying to write an algorithm modelling the 'Airplane landing problem'. The aim is to land a sequence of airplanes while minimizing the operating costs and respecting constraints such as the ...
0
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1answer
557 views

Why do piston engines have a lower fuel consumption with higher temperatures?

It is very common to find in the AFM/POH, Section 5 of most piston engine airplanes (C152, C172, PA28, BE76, etc) charts that indicate the fuel consumption for cruise/economy power settings. You ...