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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90 views

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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Which amount of fuel is important - mass or volume?

I am wondering which information of fuel amount is the significant one. Because all light aircraft have fuel quantity indicators scaled in litres or gallons, so in a unit of volume. But I heard that ...
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DA40 avgas leakage on filling

New owner of a 2012 DA40 50 gal fuel capacity.(Also new to aviation!) Recently was having the right wing filled from about 14 gal and lineman stopped within 4 gal when he noted a puddle on ground. ...
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How does a fuel density sensor work? (densitometer, cadensicon)

While some fuel volume sensors use ultrasonic measurements this answer to How is fuel mass measured in airliners? says: The FCOM lists the sensors involved in this measurement: The FQI system ...
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How does a jet engine burn fuel when it is not on an afterburner?

I understand the idea behind afterburner as fuel is added to the exhaust to increase the mass and expansion of gasses to increase the thrust, and that explains (in very obvious way) how the fuel is ...
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257 views

Why did Japanese aircraft carriers in WW2 carry both high and normal octane aviation fuels?

According to Parshall & Tully's Shattered Sword, the four Japanese aircraft carriers lost at the Battle of Midway (1942) carried both high and normal octane aviation fuel. Does anyone here know ...
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Do all Fuselage sections have same performances?

The Burnelli machines had an airfoil shaped fuselage; some indicate near 10% of lift in a 21 century airliner comes from fuselage; 'Flying Wing' concept is old, and still attracts many; bottom of ...
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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 ...
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Where is the GA community at regarding fuel/engine types?

I promised myself that I would pursue my PPL if I successfully completed my phd. I'm now doing research about the when/how I should do this, and one of the big factors for me is that there's no point ...
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Can I assume that AVGAS can be used without any problem when the engine manual suggests RON 95 or higher?

Can AVGAS 100 LL be used without any problem in Rotax 912i engine which suggests a fuel with RON 95 or higher? What would be the advantages of using AVGAS over unleaded RON 95 gasoline?
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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.
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How to safely handle AVGAS (100LL)?

Obviously 100LL is risky. It's got lead in it, so there's going to be some danger. But is it possible to not get lead into my system when I start flying? It is, for obvious reasons, something I wish ...
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How often is the fuel sampled in turbine aircraft?

In planes using avgas, sampling fuel from the tanks is generally done before every flight, or at least before the first flight of the day and then after any refueling. This is done because water ...
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Why don't all cylinders have priming lines?

Questions about the primer for carburetor engines. Why does the primer only spray fuel to three (sometimes just one) of four cylinders. (Like Piper Cherokee or Seminole) And is it true that priming ...
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What are some symptoms of a clogged fuel filter?

I can certainly imagine one of the symptoms could potentially be engine fuel starvation. If the fuel flow to the engine isn't totally blocked, how can one recognize a clogged fuel filter?
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On average, how much fuel is left in commercial flights after landing?

I recently asked what kind of fuel reserve airlines were required to have. It turns out there are international guidelines for that, which for commercial flights are: Per ICAO Annex 6, Part I, ...
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For commercial flights, is there regulations imposing a minimum fuel reserve upon landing? [duplicate]

In aviation, weight is tightly linked to efficiency. The more fuel you take, the more weight you add and the less money you earn. On the other hand, you want to pack more to deal with unexpected ...
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What is a typical fuel temperature entering the burner for different mission flight points of a civil aircraft?

Is there a target regarding the fuel temperature that enters the turbine engine's combustion chamber and if so does it change with different operation flight points in civil aircraft applications? Is ...
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In the USA, how much more expensive is 100LL compared to Jet-A1?

I have never flown an aircraft before and do not have any clue of what the fuel prices are. I was doing some research recently and found that some websites say Jet-A1 costs about 1.5 - 2 dollars per ...
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What practical alternatives are there to 100LL in 2021?

As a prospective student pilot in Southern California, I would like to avoid 100LL. Since the FAA 100LL phase-out is stalled, what other alternatives are there? Continental has a line of Diesel ...
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2answers
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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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In the B737NG, is the CTR tank fuel the first to be pumped when there is fuel in all tanks?

In a B737NG, assuming you have fuel in all tanks, Wings and Center, and that all pump switches are ON, will the fuel from the CTR tank be the first to be pumped, despite all Fuel pump switches being ...
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What is the relationship between fuel mixture, throttle setting and engine temperature?

I'm trying to understand the relationship between mixture, throttle, and engine temp. In this article from AOPA, it states ... a lean mixture of 16 to 1 is not going to burn as hot as a rich mixture ...
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How can adverse maneuverability due to a fuel tank behind the rear pressure bulkhead be mitigated in Airbus ZeroE hydrogen plane?

Airbus recently announced three concept aircraft for commercial use, powered by liquid hydrogen, with an ambition to have the plane in operation by 2035. https://www.airbus.com/innovation/zero-...
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How much pressure do boost and jettison fuel pumps produce?

What is the pressure output of a (boost) fuel pump on a Boeing 767 and/or 777, compared to a heavy-duty jettison fuel pump.
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What could I do to a give a plane an emergency boost of power for takeoff?

For some reason the pilot has to take off in an emergency or is on a runway too short or maybe they just want more places they can land and takeoff. The single engine plane is already light on fuel ...
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Do aircraft obtain better milage by flying high or by using "ground effect?" [duplicate]

It has been said the most fuel efficient way to fly is by flying in thinner air. On the other hand the largest plane in the world was the Russian "Caspian Sea Monster" Ekranoplan, which is ...
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Flying in V formation with multiple planes

Logistically choreographed using air-traffic controllers to pair like planes headed in the same direction or by scheduling flights together, how much fuel could be saved pairing planes to fly in a ...
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1answer
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How are thermals mapped in real-time?

Related to "How thermals are found" this question about "Gliding your plane to save fuel" details how to use thermals to save fuel. To use thermals to maximize range, can thermals ...
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What is Full Fuel load and how does it differ from Fuel Capacity?

I've noticed that the fuel capacity is much higher than the full fuel load. For example in a Cessna citation 560XL The Fuel Capacity is 6740 lbs The Payload W/Full Fuel load is 960 lbs Why is there ...
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How do handling characteristics depend on flying with a full vs. an empty tank?

Modern aircraft are capable of carrying a lot of fuel to achieve extra-long range; we're at a point where nearly every pair of destinations can be reached non-stop. Carrying so much fuel imposes ...
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1answer
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What is the fuel/air ratio of the CFM56-5A1 engine (in the A320 model)?

I could find the fan-bypass ratio, which was 6:1 (on some models 5:1) but I was unable to find the fuel to air ratio used in this engine. For reference, it is a high-bypass turbofan engine.
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Can TS-1 fuel be used in an aircraft that takes Jet A?

Reading up on some airports in Russia I noticed that some only supply TS-1 jet fuel (see point 7) instead of Jet A. I tried to find out more about this fuel, but only saw that it has a lower freezing ...
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Where does the MiG-29 store fuel?

How does the MiG-29 fuel system work? Like, where does it store around 300 cubic feet of fuel? Also, which fuel does it use? Is JP4 preferable?
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At what exact point in time should we be giving the 10 minutes to diversion call to ATC?

I wanted to get some clear information if it’s available as to which exact point should the 10 mins to diversion call be given to ATC with respect to our FOB. The way I have been doing it currently on ...
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Is a fuel that reacts with another to form hydrogen for fueling aircraft possible? [closed]

Hydrogen is the most abundant element in the universe and has great properties when reacting with oxygen for use as a fuel. Yet here on Earth, its production is prohibitively expensive, its storage ...
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Could we make a Hybrid Plane, But not use batteries?

What if we had wind turbines on planes. These would not power a battery but would instead power a smaller engine. Perhaps once a pilot goes to the cruising level he could activate the wind turbines to ...
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What is "company compensation fuel" and "pad fuel"?

I tried to find the definition of these fuels but I could't. Does anyone know about company compensation fuel or pad fuel? In which document can I find the definition of these fuels?
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553 views

What would happen when the fuel tank of a Cessna 172 became (partial) vacuum during horizontal flight?

Let's say we are flying a piston engine high wing airplane (Cessna 172) that uses a carburetor. What would happen when the fuel tank of a Cessna 172 became (partial) vacuum during horizontal flight?
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Could high density abrasion-resistant ceramic turbine blades allow for the use of borane fuels?

In the late 1950s the U.S Air Force searched for a fuel with similar characteristics to jet fuel but with higher energy density allowing longer flight range for bombers. In 1947 the British had ...
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Average weight of fuel required to carry 1Kg additional cargo weight per hour [duplicate]

I'm looking for an average number here, I know there is not one correct answer as there are many parameters to take into account. Alternatively, I could also use something different, like : how many ...
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Has anyone burned hydrogen in a gas turbine?

I am just wondering if supplying compressed hydrogen to a gas turbine (combustor) would be a better fuel as it has three times the octane rating of kerosene. It just seems better all around.
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How is the fuel quality monitored/assured for jetliners?

With tens of thousands of flights daily, many out of smaller and perhaps 'sketchy' airports, it would seem that serious incidents caused by contaminated fuel should happen a lot more often (in a quick ...
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How might one fly from KRYN to SDRS in a de Hallivand DHC-6 Twin Otter?

First of all, this is not a flight I'm attempting myself; it's for a writing project. I myself have absolutely no knowledge at all of flight. The plane would depart from Ryan Airfield, Arizona (ICAO: ...
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Why would a plane perform 360° turns to balance fuel on the ground?

Why would a plane need to do a couple of 360’ turns on the taxi way/run-up area. The crew were given clearance to taxi and hold. They told the tower they needed to turn the plane 360’ and were cleared....
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What is the Difference between mogas and avgas? [duplicate]

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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863 views

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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681 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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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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