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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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
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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 ...
4 votes
2 answers
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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),...
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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 ...
15 votes
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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 ...
7 votes
2 answers
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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 ...
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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 ...
12 votes
4 answers
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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 ...
3 votes
1 answer
232 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. ...
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5 answers
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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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4 answers
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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 ...
8 votes
2 answers
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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? ...
7 votes
2 answers
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How much fuel is used for the different phases of the flight of a typical airliner?

An Airliner flies from LA to JFK in 5 hours. In the first 30 minutes the plane climbs to about 30,000ft. For the next 4 hours the plane flies at about 30,000ft. For the next 30 minutes the plane ...
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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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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 ...
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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?
21 votes
2 answers
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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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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 (...
4 votes
1 answer
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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 ...
4 votes
1 answer
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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 ...
18 votes
5 answers
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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 ...
3 votes
1 answer
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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 ...
9 votes
2 answers
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What is the operating temperature of a turbofan engine, and how is it kept at that temperature?

What is the operating temperature of a turbofan engine? If advancements were made to materials through material science for the internal components would increasing the operating temperature result in ...
2 votes
1 answer
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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 ...
4 votes
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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 ...
19 votes
1 answer
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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%-...
7 votes
1 answer
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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 ...
9 votes
1 answer
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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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1 answer
428 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% ...
18 votes
1 answer
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Why would a B-29 consume more fuel at 17 kft than at 9 kft?

According to Wikipedia, one of the factors which almost caused B-29 44-27297 (Bockscar) to run out of fuel and crash at the end of its 9 August 1945 strike mission was the selection of an excessively ...
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1 answer
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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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3 answers
1k 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 ...
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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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4 answers
648 views

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) ...
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1 answer
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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.
6 votes
1 answer
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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, ...
1 vote
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Does airspeed impact fuel flow?

Let's say an F-104 Starfighter is flying at sea level at 600 KIAS with throttle at 100% RPM. Then, let's say the F-104 is still flying at sea level, but the pilot reduces throttle and airspeed falls ...
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Why are F-15s usually taking off with afterburners?

If there's no emergency, is it a big waste of money for military aircraft to take-off with afterburners? Why are they doing it, what are the advantages? Like here:
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What is the fuel consumption per mile for a full CEO A320?

I’m writing an essay as part of my GCSE HPQ and one of the statistics I need to base my research and answer on is the fuel consumption per mile or kilometre for a CEO A320. It doesn’t have to take ...
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2 answers
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How does fuel economy quantitatively depend on altitude for a jet?

We already have a few questions and answers about the qualitative effects of altitude on fuel economy: How do I determine the best altitude to fly for fuel economy? Why does fuel consumption decrease ...
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2 answers
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Can thermals or high density altitude improve fuel efficiency?

Suppose a pilot is just cruising around building flight time. In order to get the most flight time for fuel, would flying on a dry cold day or on a hot thermal filled day save fuel?
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Can the plane Celera 500L be eight times more fuel efficient than a jet of similar size and capacity?

Celera 500L (see Otto Aviation site for more details) is a plane with a single propeller powered by a piston diesel engine. The constructor claims it is 8 times more fuel efficient than a jet of about ...
17 votes
5 answers
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Has there been any attempt to use an underground cable system, a la a cable car, to tow aircraft along taxiways? [duplicate]

I've been looking at some proposals to try to reduce the time that an airliner's main engines are run at idle or near idle when taxiing to and from runways--a situation that uses non-trivial amounts ...
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How do I find out the fuel consumption of the PT6A for a lightly loaded aircraft?

The Fuel consumption of PT6 engines provided by manufacturers are as follows. Cessna Caravan - Consumption ~47? GPH. At full load at ~160? Kn. Quest Kodiak - Around 49 GPH at full load at ~170 Kn ...
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What is the ground idle fuel flow of an A320 (CFM or IAE or neo)?

Standing on ground, what is the idle fuel flow of an A320? ISA conditions, both engines running?
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Was it ever considered to optimise a jet to normally operate with one engine shut off?

As I understand it, the current trend to reduce all commercial aircraft to no more than two turbofans has long-relevant reasons – the more engines, the higher the fuel consumption – and earlier jets ...
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Why is the thrust-specific fuel consumption much worse for high bypass turbofans at cruise?

General Electric GE90 Takeoff: 0.278 lb/lbf/h (28.3 kg/kN/h) Cruise: 0.545 lb/lbf/h (55.6 kg/kN/h) Source: https://en.wikipedia.org/wiki/General_Electric_GE90#Specifications I assume this is typical ...