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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191 views

What is the Difference between mogas and avgas?

Could anybody tell me the primary differences between mogas and avgas?
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Do modern jet engines need igniters?

I've read that modern aircraft don't need spark plugs like conventional aircraft do, as the jet fuel autoignites once it's mixed with the hot air exiting from the compressors. Then why do aircraft ...
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1answer
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What is nominal n1 and fuel flow behavior during cruise climb?

For a commuter airliner (e.g. 737) performing a cruise climb (step climb) at a constant Mach, how should n1 and fuel flow behave? I know that fuel flow should decrease with altitude (air fuel ratio). ...
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1answer
143 views

What is the meaning of these Lido abbreviations?

Can someone help with the abbreviations and meaning from Lido flight planning: RCONT 5 MIN HLDDST ADDT For each of these abbreviations, the flight plan has fuel and time: I placed a red rectangle ...
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111 views

When does fuel indicator indicate red index? C172

Full fuel is 56 gal and usable fuel is 53 for c172r. Other than when the fuel indicator is broken, when the fuel indicator indicate red index? Is there any fuel quantity setting to indicate red?
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Would building an airport at 30,000 ft save money?

So... this would obviously cost a ton of money initially, but long-term, I believe the savings both environmentally and financially would be returned many times over. If a building can already be ...
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1answer
282 views

Does one-engine cruise consume less fuel than two-engine cruise?

Scenario 1. A two-engine airliner experiences rapid depressurization and makes an emergency descent to 10,000 ft, and diverts to the nearest airport. Scenario 2. The same two-engine airliner ...
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4answers
166 views

What determines a plane's range?

When a planes maximum range is specified, is fuel [capacity] the only constraint or what else is taken into account? Would it always or ever be the case that a greater fuel capacity will increase ...
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1answer
315 views

Topics for high school chemistry project (IB Chemistry IA)? [closed]

I have to do an IB Chemistry IA and I wanted to relate it somehow to aviation; however, I can't do anything super complicated though because I'm only a high schooler. Here are some possible topics ...
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Why can’t the CF34 use wide-cut fuels?

The General Electric CF34 high-bypass turbofan (used primarily on the Bombardier CRJ and Embraer E-Jet regional jets), unlike the vast majority of jet engines (both civil and military), is not ...
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1answer
131 views

Aircraft drop tank identification needed

I was wondering if anyone can help me identify either of this drop tank? It measures about 11' long. Any help would be greatly appreciated! Thank you.
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1answer
228 views

How willingly does US Military sell fuel? [closed]

Okay. I somehow (Either through a emergency or because I "miscalculated" fuel burn) landed on a US military airfield in a semi rural place in a state in US mainland without a airport pretty nearby ...
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4answers
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What happens if you do emergency landing on a US base in middle of the ocean?

A theoretical situation. I fly from Honolulu International to the Bejing but my private jet gets fuel starvation and then I land on the Wake Island airstrip. What happens next? Would the military ...
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1answer
211 views

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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1answer
79 views

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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1answer
36 views

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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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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1answer
148 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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337 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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1answer
152 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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1answer
310 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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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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1answer
305 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
221 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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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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531 views

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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1answer
128 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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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
566 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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40 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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1answer
397 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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2answers
719 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
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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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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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311 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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1answer
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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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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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1answer
157 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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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
437 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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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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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
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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
481 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
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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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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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303 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?