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Questions tagged [fuel]

Different aircraft engines use different fuels; the most common types are Jet A or A-1 for jet and turboprop engines, and avgas for piston engines.

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How much fuel gets dumped and why?

WRT Would the Aeroflot Flight 1492 have been able to dump its fuel first before landing?, I am wondering how much fuel gets dumped every year? gallons? litres? pounds? Also, is it only in unplanned ...
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Is it cheaper to drop cargo than to land it?

Is it more fuel efficient to drop cargo onto a runway from the air en route to a final destination than to land and unload it using a more fuel efficient plane?
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How much is the fuel consumption of a Tecnam P2002?

So I'm gonna have the training for PPL and I wanted to know the fuel consumption of a Tecnam P2002 aircraft. But I couldn't find any aircraft information for this particular plane.
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High altitude turbine efficiency question [closed]

The simple reason turbine engines are more efficient at high altitudes is because as the air becomes less dense it requires less fuel as the ratio has to remain constant. This holds true up to ...
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494 views

Why is alcoholic gasoline such a showstopper for aviation?

One of the main reasons the common avgas grades are still full of 3-plumba-3,3-diethylpentane is the incompatibility of many aircraft fuel systems with the oxygenates (primarily ethanol, with some ...
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94 views

Do different grades of leaded avgas differ in ways other than their lead content?

Although only one grade of leaded avgas (100LL, standing for 100-octane, Low-Lead)1 is in common use today, there were formerly a number of different leaded avgasses with higher octane ratings and ...
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What features enable the Su-25 Frogfoot to operate with such a wide variety of fuels?

It is widely attested* that the Su-25 Frogfoot's engines (the Turmansky R-95Sh and later the R-195) were designed to function using a wide variety of fuels, including diesel, gasoline, petrol, ...
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200 views

Is it safe to mix different types of fuels in a jet engine?

Hypothetically, if: one got stuck somewhere at a remote airport the jet aircraft or airliner they are flying had a 1/3 tank full of the proper jet A1 fuel there was a tanker at the airport with 1/3 ...
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93 views

For IFR flights that require two alternates, is there a regulation that requires enough fuel to reach the furthest one?

For flights that have two alternate destinations, I'm looking for a reference - either EASA or ICAO - that states that you need enough fuel to reach whichever alternate would require the most fuel to ...
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125 views

How fast can pushback tugs actually go? (maximum possible speed)

For school, I'm doing a project where we choose a topic about anything, ask questions, and learn about it. I chose my topic as fuel efficiency of airplanes, and one of the things I want to research as ...
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51 views

How much fuel did the N Class Navy blimp carry?

The Navy N Class blimp was powered by 2 Wright R-1300 Cyclone 7 radial engines and was able to cross the Atlantic and back again without refueling. How many gallons of fuel did it carry for a maximum ...
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173 views

Why aren’t any JP-1-type (extreme-narrow-cut) fuels in use today?

JP-1 was the first U.S. military standard jet fuel (hence the 1 in the designation), with its specifications issued in 1944; it was an extremely narrow-cut, high-alkane kerosene, not far from what ...
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121 views

What is the minimum takeoff fuel requirement policy for commercial aircraft? [closed]

I am currently working on a fuel burn analysis of a particular route (ATL to DCA). I really want to predict takeoff weight of the flight; however, I realized that it's not easy to get the information. ...
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1answer
114 views

Fuel De-aerating Tank?

I know turbine engines (bearings) are cooled by oil jets and that when oil is scavenged from the bearings it is more of a mist than a liquid, hence the need for various types of de-aerating this mist ...
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78 views

Are there any feasibility studies or research regarding the possibility of using Jet A in tropical countries?

Based on the ASTM D1655 standard specification for turbine fuels, the only difference between Jet A and Jet A-1 is the freezing point. Max [min?] -40 degrees Celsius (-40° F) for Jet A and max -47 ...
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Can the CG move out of bounds as fuel is used?

I've never bothered to check the weight and balance when the tanks are empty. I always assume that if the Center of Gravity is within range when the tanks are full, then it will remain within range as ...
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162 views

Why aren't any jet fuels heavier than Jet A/A-1/JP-8 in common use?

The commonly-used jet fuels fall into two main categories: Straight kerosenes (Jet A, Jet A-1, JP-8, JP-5, plus, historically, JP-1), which are used in most situations because their high flashpoints ...
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123 views

What's this fuel line for?

Cessna 414 ram conversion What's this fuel line for that is coming to injector , other then the one from fuel disturbutor ?
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109 views

How can we calculate the fuel that we need?

Let's assume that we are crossing the Atlantic (about 3,878 miles) with a 737-8 MAX. How can we calculate the fuel that we will use during our flight?
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1answer
459 views

Why does Schiphol airport have such a long taxi way? [duplicate]

I heard that from runway 18R-36L the taxi time is around 20 minutes, I heard that this runway was built and is used mainly to reduce noise pollution, but what reasons are there for the length of the ...
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28 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 ...
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216 views

What does it cost to get a hot air balloon to 30,000ft?

I'm interested to know what it would take to get a hot air balloon, with a 600lb load, to 30,000 feet. Is this cheaper than flying a plane with a similar load to the same altitude? If a special ...
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610 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 ...
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3answers
2k views

Are there any 100% renewable energy aircraft in development?

There seem to be several options for aircraft R&D regarding cleaner fuels for the time when fossil fuels are no longer economically viable. Some of these include: Algae. A drop-in fuel. These ...
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3answers
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How can flying high minimize drag and increase fuel efficiency? [duplicate]

As a plane goes higher, the engines have to work harder to compensate for the air density, therefore it will require more fuel in order to provide the same power at lower altitudes. But I always hear ...
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219 views

Are there different symbols or graphics to identify different types of GA fuels?

Are there different symbols to identify the different types of fuels used for general aviation aircraft?
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226 views

Has fuel boiling ever been an issue for high altitude aircraft?

Are special measures being taken to prevent fuel from boiling inside the fuel systems at high altitudes? If so, when (with what aircraft) did this practice start? (question is pertaining to air-...
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453 views

How about inventing a “fuel” that will not erupt into fire?

One of the most concerning factor in flight safety is the possibility of the plane erupting into fire due to a fuel spill and a spark. Is it possible---or have researchers ever worked on---to power an ...
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2answers
349 views

Is there an additive that can lower the freezing point of jet fuel?

Does an additive exist to decrease the freezing point of jet fuel? I have found an additive that decrease the freezing point generated by drops of water (appears between 0 and -10°C), but I'm needing ...
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1answer
153 views

What is the late BF109's (G models) internal fuel capacity?

What is the late BF109's (G models) internal fuel capacity? I've been trying to google the answer for a few hours with no luck, perhaps someone here has the right source
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225 views

Does wing paint colour improve airplane fuel efficiency?

If birds that fly very long distances like seabirds have darker colours on top of the wings and lighter colours underneath the wing, is it possible that painting airplane wings similarly may improve ...
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1answer
364 views

How much fuel does an airliner consume during passenger boarding?

As I understand, sometimes APU is running during the passenger boarding. How much fuel do the APU consume during this process? Of course, it must depend on the total boarding time, so I think it ...
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2k views

How can I calculate the fuel required for a specific route and aircraft?

Okay, I'm writing a online game. I've got two airports and the equipment. For example: Heathrow - LAX on a 744. What I want to work out is the fuel required, as this will apply a cost to the airline. ...
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255 views

Is this test question correct about the causes of detonation?

So detonation is explained brilliantly in the answer of this question. In the accepted answer, NathanG goes on to say the following: the octane rating of a fuel is basically the amount of pressure ...
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2answers
485 views

What to do when fuel is exhausted and we are denied landing by ATC?

What to do when fuel has exhausted and we are denied landing by ATC? If we were denied landing it means we are close to the runway, and thus if we are intending for a forced landing, the runway could ...
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4answers
447 views

Could modern military aircraft be retrofitted to work with alternative fuels instead of kerosene?

I am geologist and I have heard in 50 years petroleum will be nearly gone. I know for commercial planes there are working projects with clean energy. I can be wrong, but I think military systems ...
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How much water is produced in jet exhaust?

If a jet has typical combustion efficiency, what equivilent amount of liquid water will be created per gallon of jet or kerosene fuel. An acceptable answer can be a ratio in weight or volume to the ...
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2answers
515 views

Why are jet fuel prices very similar in North America and Europe, yet automotive fuel prices are very different?

Why is the pricing difference of jet fuel between North America and Europe extremely small, unlike automotive gasoline? As of June 22, 2018, the prices in USD per barrel of it between the two ...
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284 views

How the fuel in the wings is managed in case of an engine failure?

Consider an aircraft has fuel tanks only in wings (No central tank). Will the fuel for the respective engines will be consumed from the respective wings? In case of a single engine failure, if the ...
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5answers
271 views

Can air to air refueling can be done in the rocket engines as done in the Aircraft jet engines?

Can air to air refuelling can be done with rocket engines as is done with conventional aircraft jet engines? If no then what are the possible hazards or conditions preventing this?
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How much air does a GE90 ingest at sea level and at cruise level per meter?

I just wanted to know how much air PER METER a GE90 turbofan engine sucks in considering the same thrust output at different altitudes to better understand how the engine can travel further while ...
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1answer
209 views

How did Airbus fit 6,340 gallons more fuel into the A359?

Bloomberg posted an article that says, among other things, the A350 ULR variant increases range by utilizing "additional space already available in the existing tanks to carry an extra 6,340 gallons ...
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272 views

How bad is the efficiency of jet engines under low loads?

VTOL operations need 4-5 times more thrust than a conventional take-off of an aircraft. If you don't want to install additional lift-engines into a hypothetical aircraft and use thrust vectoring to ...
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191 views

Why are biofuels usually blended with standard jet fuel when used?

When biofuels are used in both demonstration and commercial flights, it is common for them to be mixed with standard Jet A fuel. Is this due to safety reasons, cost or due to specific properties (e.g. ...
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1answer
3k views

How much fuel does the A380 use for taxiing before takeoff?

How much fuel does the A380 use for taxiing before takeoff and after landing? What does it cost at today's pricing?
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393 views

Chemtrail Conspiracy theory [closed]

Could this be true? https://www.facebook.com/migyal.imisyou/videos/2514422715448542/UzpfSTEwMDAwODE2OTc1NjA4NDoyMDQxMDc4Nzg2MTc0NDI3/ A friend has posted this - of course, I have been looking ...
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772 views

What is the relation between drag and weight?

Given an aircraft type and fixing its wing configuration (flaps, slats) and fixing its speed and altitude and assuming it flies horizontally, what is the relationship between the aerodynamic drag and ...
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1answer
266 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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1answer
894 views

Is military grade jet fuel more expensive than civilian grade?

Is military grade jet fuel more expensive than civilian grade? Why are governments moving away from military grade jet fuels?
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1answer
94 views

FAA Turbine engine FCU regulations

Does the FAA have any regulations governing the design of a turbine engine FCU? I'm being questioned about an older Beechcraft PT6A FCU - in particular, how can I guarantee that when the power ...