# Questions tagged [fuel-consumption]

The amount of fuel an aircraft burns during a specified time period or for a specified distance; also known as "fuel burn".

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1 vote
18 views

### Input Parameters for Combustion Chamber

I am doing a column breakup study. But for a better study I need air velocity, turbulence intensity (not primarily needed though),temperature, pressure and same parameter for injected liquid fuel. I ...
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1 vote
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### AirBus A380 and Boeing 747 - fuel consumption while taking off?

I have talked with my friends about fuel consumption while taking off. None of us know much about airplanes, so I'm asking here, because I didn't find an answer searching on the internet. How much ...
192 views

### How much fuel can be saved in a half full of passengers plane?

On a typical airliner (let's say A320 / B737 / or similar), comparing a plane full of passengers vs one half full, how much fuel an airline can save on a trip when the plane is only half full? (This ...
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### How the EFD system of F18e shows the fuel in tanks of the fighter?

I was seeing this image: How the EFD system of F-18E/F shows the fuel in the tanks of the fighter? I mean it's very low. e.g. 7.2 lb? Is it rounded?
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1 vote
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### Determining Required Fuel from Payload/Range Diagram

I would like to determine the amount of fuel required for a flight at a given range/payload combination - ideally from the payload/range-diagram [1] of the corresponding aircraft alone. I know that ...
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224 views

### Max Range Relationship to Altitude for Propeller-Driven Aircraft

Chapter 11 of the PHAK states, "If a change in altitude causes identical changes in speed and power required, the proportion of speed to power required would be unchanged. The fact implies that ...
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695 views

### Airliner sharp wing tip vs elleptical [duplicate]

Now that most airliner manufacturers are using composite materials for wings, making compound curves is much easier to produce, why aren't we seeing elliptical wings, outer panels or wing tips? ...
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### How to calculate fuel burn rate in Model BK117 helicopter

I am confused which parameters we are use, I have fuel quantity, fuel flow, fuel weight and speed etc is there so how to using and which parameters using the Endurance time calculate in helicopter
1 vote
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### Are Runway Profile Descent charts available to non-121 carriers? If so, where can I find them?

AIM 5-4-2(c) says: When crossing altitudes and speed restrictions are issued verbally or are depicted on a chart, ATC will expect the pilot to descend first to the crossing altitude and then reduce ...
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### What are the parameters typically used by airlines to assess the fuel economy and efficiency for their flights?

Are there parameters that are typically being used by airlines to assess the fuel economy and efficiency done in their flights? And how exactly those parameters are being used to do the assessments ...
841 views

### What are the standard numbers for fuel consumption (kg), kg/NM, and kg/h, of Boeing 737-300?

I'm currently working on a school project regarding the analysis of Boeing 737-300 fuel consumption. I'm working on some parameters that my supervisor gave me, which are : Total fuel consumption (kg),...
230 views

### How much fuel cost will be incurred for transporting 4000kg of cargo via Mi-17 helicopter for 54 km?

I am working on a logistics case study in which I am using Mi-17 helicopters for transportation of relief to the affected areas in a disaster. In this regard, I want to check my estimates with the ...
5k views

### Does flying slower actually save fuel?

Following a discussion on travel.SE, I wonder: would flying more slowly actually save fuel? I suppose that it would save fuel on a volume of fuel per flight hour basis, but the flight would end up ...
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### What would be the range of a cargo 777 full of usable fuel up to MTOW?

Having read about Rutan's Voyager and more recently about Virgin Atlantic GlobalFlyer I wondered how would some modern long haul airliner such as a cargo Boeing777 (or other airliner) perform at this ...
535 views

### How does the Boeing TTBW reduce fuel consumption?

Compared to a traditional airliner wing, the Boeing Transonic Truss-Braced Wing (TTBW) showcases a much longer wingspan and an associated higher aspect ratio. Intuitively, this seems to reduce fuel ...
1 vote
48 views

### Is there a specification of how efficient a fuel consumption / fuel burn of an airplane or engine could be?

I'm working on a project to determine whether, based on real flight data, is a flight efficient in its fuel burn/consumption. From the analysis of the flight data, i got fuel burn calculation, per ...
8k views

### Which engine is more financially economical to operate, a turboprop or gasoline engine?

I've seen a discussion about this somewhere before. I'm aware that there's no real way to calculate this. So rather then comparing weight and volume for efficiency, let's compare prices. Which engine ...
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### Where to find the official specification of Boeing 737-300 fuel consumption rate and such?

I've been doing some work regarding the analysis of Boeing 737-300 fuel consumption in commercial flights, and how all of them fare with the fuel consumption standards, like fuel consumption rate at ...
259 views

### What would the effect be of flap deployment on a UAV such as the Reaper or Predator?

I've read answers that said that the climb performance is usually worse with flaps extended, and the pilots would, if they could, just retract them and get into a clean config as soon as possible. ...
3k views

### What difference does altitude make on fuel efficiency? [duplicate]

Most commercial flights are between 29,000 and 42,000 feet in altitude apparently. But I realise I don't know why. My guesses are: If you fly too high the air pressure gets very low and you have to ...
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### Does a helicopter actually have a lower rate of fuel consumption in cruise than in hover? [duplicate]

Recently the thought of autogyro flight as "powered autorotation" came to mind. The rotor acts like a fixed wing, providing lift, while a separate source of thrust provides forward motion. ...
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### Does a 120cc engine burn 120cc of fuel a minute?

I have heard that a 120cc engine burns 120cc or 120ml of fuel per minute. Is this true?
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### Which aircraft has the best fuel mileage per person?

I was looking at a BD-5 that got 32 miles to the gallon for one person and wonder: Which plane gets the most fuel mileage if you divide the number of passengers against the mileage of the plane? ...
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1 vote
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### What is the thrust specific fuel consumption of a JT9D engine used for the Boeing 747SP?

I searched every inch of the internet still couldn't find the value of JT9D thrust specific fuel consumption (TSFC) , I just found the SFC which is around 0.37. Can anyone help please?
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1 vote
2k views

### What is the fuel burn of a 787-9 on a ferry flight?

I can't find any literature on 787-9 fuel burn for ferry flights, meaning no cargo or passengers, just crew. An 787-9 burns about 5400 litres when on normal commercial service. How does it change when ...
112 views

### How does fuel economy on Diamond DA62 change as passenger weight increases?

How many more gallons per hour is required to fly extra 1kg of weight on a Diamond DA62 aircraft or similar aircraft?
1 vote
661 views

### Can I calculate fuel consumption for given reduction of drag coefficient?

If plane or car has Cd of 0.35 and 5L/100km, how much will be fuel consumption if Cd is reduced to 0.20 and everything else stay the same(weight, frontal area,power etc)? Is it possible to calculate ...
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### Has a plane ever run out of fuel while taxiing?

When planning a flight, the pilots calculate the fuel load, allowing for diversions, delays, etc. While listening to an ATC recording of 30 minute taxi times at JFK, I wondered whether a plane has ...
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### At what angle to the ground track does wind become favorable to lower fuel consumption?

We can all agree, flying from point A to B, a headwind will increase fuel consumption, and a tail wind will reduce it. The "jet stream" inspires these types of thoughts. Quartering headwind,...
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### Am I calculating the fuel consumption correctly?

I'm trying to calculate the fuel consumption for l550e engine. In its datasheet you can see this graph: At 6500 RPM, engine power is around 48hp and the SFC is 345g/HPh. Ok, then the fuel consumption ...
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### How did the 767/757 reduce fuel burn relative to older aircraft (like the 727)?

When Boeing launched the 757 and 767 aircraft, they widely touted it's improved fuel efficiency relative to previous airliners. Notably: Delta stated that the 767 was "quieter and 30 percent ...
5k views

### Would an airliner climb higher late in the flight because of the consumed fuel (lighter airplane) to save more fuel?

Some people said airplanes would fly higher in the late period of each flight, because the fuel is consumed, and the airplane is lighter. Higher altitude and less dense air is enough to support the ...
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### Is this concept of a hybrid between a Turbine Engine and a Reaction Engine (Rocket) practical? [duplicate]

So, I don't understand much about engineering in general, but since this is a discussion forum, I like to think that this is just a thought exercise (because it is probably useless). So, the idea ...
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### How far could a KC-10 tanker fly if it consumed all of its internal fuel tanks?

I have read that the KC-10 tanker aircraft carries a maximum load of 356,000 lbs of fuel. It also consumes the same fuel that it carries for refueling other aircraft. So naturally, I am wondering: If ...
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### Does endurance include the fuel reserve time?

I have been wondering if endurance time actually includes the fuel reserve time? For example: Total usable FOB = 84 litres Fuel burn rate = 16 litres/hour Aircraft's reserve fuel = 30 minutes ...
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### Why is the 777 fuel burn rate graph U shaped and skewed to the left?

I don't know math or physics. If I misuse terms, just edit my post, thanks! Presuppose a normal uneventful flight, such that as the plane climbs and cruises, the pilot reduces engine thrust to 69%-...
663 views

### Why is my calculated seat-miles per gallon of small aircraft higher than of big aircraft?

I've calculated the seat-miles per gallon for three planes. This factors in the speed; it basically means how much does it cost to transport 1 person 1 mile. Plane Seats Cruise (MPH) gph seat-mpg ...
1 vote
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### Why doesn't the -30% SFC fully account for the dramatic reduction in fuel consumption compared to the 1960s?

In looking at the specific fuel consumption (SFC) of some aero engines I find that for example, the Rolls Royce Conway turbofan engine had typical cruise SFC of 0.874 lb/(h lbf) whilst the most modern ...
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1 vote
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### What is the specific fuel consumption and cruise thrust of PW1521G engines?

I'm looking for the specific fuel consumption (SFC) and thrust related to PW1521G in cruise regime, as well as the associated assumptions for these ratings. I can't find them online.
1k views

### What is the function of the aft stator in CFM's open rotor engine design?

CFM revealed their design for a open rotor propfan engine with two stages of blades - one active set of blades rotating in the forward and an static sets of blades on the aft. According to The ...
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### How could I minimize the take off fuel consumption?

How could I minimize the aircraft total takeoff fuel consumption, taking into account all fuel used from start of take-off roll until reaching a safe altitude? For example, if I fly with flap ...
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1 vote
459 views

### What's the optimal cruise lift to drag ratio of the Piaggio Avanti?

I'm interested in the maximum L/D this plane can achieve. I can't find the necessary data to do the calculation myself. If I knew the "long range cruise" engine power and assumed 85% ...
1 vote
2k views

### Is the FF (Fuel Flow) the fuel consumption index?

I am creating a program to calculate the fuel needed to fly and I need to know the fuel cost of the plane. In the boeing 737-800 (PMDG), on the display that shows the plane's systems, there is the FF (...
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1 vote
156 views

### What factors cause a turbine aircraft to have decreasing fuel burn over time?

Consider a fictional aircraft with a fuel schedule similar to the following: ...
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### Why does using carburetor heat increase fuel consumption?

As written above, why does using carburetor heat increase fuel consumption? Because I found such information in a few SOPs for piston airplanes and I do not understand why does it happen
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### What is the fuel burn rate for climb of a C-130J Hercules?

I am trying to graph the payload range for a C-130J Hercules and I need an approximate value for fuel burn rate which I cannot seem to find online. Does anyone know approximately how much fuel a C-...
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### What is the fuel burn of the APU on the CRJ900?

Looking for a reference from an FCOM, AFM or other manual for the fuel consumption per hour in pounds or kilos of the Honeywell RE 200 APU on the CRJ900.
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### How do jet streams affect the fuel consumption?

I am trying to wrap my head around the effect of the jet stream on energy consumption as well as flight time. My understanding is that everything that has to with the flying part (vs navigation) ...
226 views

### What are the engine-out implications of giant turbofans?

It seems that turbofans for civil airliners are improving fuel efficiency by building larger and larger fans that spin slower. For example, the RR Trent 800 introduced in 1993 had a diameter of 2.8m, ...
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