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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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29 votes
3 answers
12k views

Where does Air Force One refuel?

Obama came to Greece and then to Germany. That's a long trip, even for the majestic Jumbo. There was a lot of discussion about where the aircraft was refuelled during that trip. Do we know, in general,...
2 votes
1 answer
213 views

WWII fuel gauge: single needle and dual range

In T-34 movie there is a scene where a WWII small aircraft is flying: and the pilot warnings the official that they're running out of fuel and a quick close up of the cockpit shows the fuel gauge: ...
3 votes
1 answer
933 views

Where to find fuel type & fuel consumption info for PW 1000G engines family?

Where I can find the information about fuel type and fuel consumption for PW 1000G engines family?
8 votes
2 answers
3k views

Cruise with a single engine in a twin, good idea?

Airlines are looking to lower costs every single day. I wonder if it makes economic sense (fuel costs) to operate a airliner using only one engine during cruise, while keeping the second engine at ...
0 votes
0 answers
34 views

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
806 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),...
39 votes
3 answers
85k views

How do aircraft keep fuel from freezing while in flight?

On aircraft which fly above 30,000 feet, the temperature can often can get to temperatures below Jet-A's freezing point. For example: at 36,000 feet the standard outside air temperature is -56.5°C (-...
1 vote
2 answers
2k views

How diesel fuel is injected into the cylinder of a diesel engine?

I am wondering how is diesel fuel injected into the cylinder of a diesel engine. Despite the difficulties of detonation, I think maybe a gradual injection of fuel during the power stroke will be ...
2 votes
1 answer
307 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 distributor?
0 votes
0 answers
71 views

What percentage of US carriers do fuel hedging?

What is the percentage of US carriers that are hedging fuel? Who are they, other than Delta who still owns a refinery?
2 votes
1 answer
341 views

Are auxiliary fuel tanks optional on the Boeing 737 Max 9?

Does the Boeing 737 Max 9 have auxiliary fuel tanks like the Boeing 737-900ER? And have any airlines ordered them without if optional?
60 votes
5 answers
11k views

Why would a fighter drop fuel into a drone? [closed]

According to the BBC: A feed from a camera fitted under the fuselage of the surveillance drone shows a Russian SU-27 making two extremely close passes while releasing, what appears to be, fuel as it ...
1 vote
1 answer
97 views

Diesel engines market share in Piston Airplanes market

I am just trying to understand the diesel engines market-share in the piston airplanes market. Any experience or idea about that ? Just to understand if it is 1% or 10% or more. Thanks in advance for ...
5 votes
2 answers
1k views

Do fuel tanks need to be pressurized?

Do fuel tanks need to be pressurized? It's my understanding that the pressure difference between the outside air and the inside fuel would force the kerosene out of the fuel tank. What stops this from ...
3 votes
1 answer
211 views

On the A321neo, what determines the 'time to land' when an Additional Center Tank System Fault is triggered?

On the A321neo, the QRH has a procedure in the case of a ACT (Additional Center Tank) System Fault (Found in the QRH under Abnormal and Emergency Procedures, Fuel). When such a fault occurs, you must ...
1 vote
0 answers
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 ...
8 votes
1 answer
356 views

Approved Mixtures of Fuels in ROTAX 912 Engine

The Rotax 912 is a popular combustion engine in smaller general aviation aircraft in Europe. Due to a number of factors (including fuel cost), the Rotax-powered aircraft in our flight school are most ...
9 votes
3 answers
2k views

Why wasn't MH-17 flying at 33,000ft before it entered Ukrainian airspace?

I was looking at the path of the MH-17 flight that crashed in the Ukraine on FlightRadar24 and noticed it was flying at FL310 (31,000ft), then because of the Ukrainian NOTAM which went up to FL320 (32,...
2 votes
2 answers
454 views

How free are VTOL pilots to hover?

When piloting a Harrier or F35 can the pilot just hover at will? Or is this possibly something that will eat up lots of fuel, and should only be done when planned? (like for landing) Is spontaneously ...
7 votes
1 answer
2k views

How much did Avgas cost in 1940?

I am interested in historic fuel prices; How much did Avgas cost in 1940?
2 votes
1 answer
444 views

Cessna 172S model starting procedure

I just recently started flying a fuel injected cessna after flying carb heated M and P models, and have a question about the starting procedure- particularly about the “warm start”. when we start the ...
4 votes
1 answer
297 views

Nutritional value of jet fuel (from a microbe's point of view) and which of their byproducts is causing the fuel tank corrosion?

Self-described "pilot, aerospace engineer, and mad scientist" YouTuber Jack Schneider's video Growing Microbes in Jet Fuel explains that if a layer of water accumulates below jet fuel (due ...
0 votes
1 answer
107 views

How to measure fuel level from uneven tank?

If you measure the fuel level with a dipstick on the C172 I fly, you can get two different readings. This is because directly under the filler cap opening there is a cuboid-shaped sensor. Obviously, ...
0 votes
3 answers
585 views

Did I calculate this fuel consumption correctly?

My PPL oral exam study guide contains this question: If gallons-per-hour is 9.3 and time is 1 hour, 27 minutes, how many gallons will be consumed? The book says 3.5 gallons, but im getting 13.5 ...
4 votes
3 answers
4k views

Since jet fuel is cheaper, why do pistons still use av-gas? [duplicate]

Since jet fuel is cheaper, why do pistons still use av-gas? Why is 100LL used at all?
2 votes
1 answer
738 views

Why do planes explode upon high velocity impacts?

I usually see fatal plane crashes end with a huge explosion, what causes the fuel to ignite?
29 votes
3 answers
13k views

Why don't we see business jets with wingtip fuel tanks anymore?

There is something I miss from the Learjet 35 (one from FS95/98) that I don't see any more: Fuel tanks on the wingtips! What happened to the wingtip integrated fuel tanks in the business jet industry?
5 votes
1 answer
159 views

Radar fuel level sensor

Do any aircraft use radar to measure the level of fuel in their fuel tanks?
17 votes
4 answers
8k views

Where I can get historical jet fuels prices?

I would like to analyze jet fuels prices in 2014. Where can I get jet fuel prices for 2014, only in USA and Russia? As there are different types of fuels, it would be okay to get prices for one (...
3 votes
0 answers
195 views

Is there any authoritative source where I can find a list of companies producing Sustainable Aviation Fuel in the U.S?

Is there any authoritative source (website, directories, etc.) where I can find a list of companies producing Sustainable Aviation Fuel (SAF) in the U.S? Based on media reports it seems that there are ...
3 votes
2 answers
587 views

How can I determine the fuel temperature in the tanks of an Airbus A320 during climb?

I know that, for example, at 10000ft the outer temperature is around $-10\, ^\circ\! C$. How can I calculate the fuel temperature in the tanks? In technical notes I find on the internet for Airbus ...
1 vote
1 answer
349 views

Calculate Block Fuel based on Altitude, Temp, Taxi Fuel, Time for climb/approach and landing

I'm preparing for my EASA exams and one of the questions I came across for the "Flight Performance and Planning" exam sounds like this: For planning a VFR flight, the following data are ...
6 votes
1 answer
638 views

How is Fuel needed to be consumed calculated when MTOM and Actual Mass is known

I'm practicing for my EASA PPL(A) exams and one of the questions I came across looks like this: How much taxi fuel must be consumed before take-off to reduce the aircraft mass to the maximum take-off ...
6 votes
5 answers
6k views

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?
7 votes
3 answers
2k views

How do rental prices that include fuel work if you refuel?

If a plane rental price includes fuel, what happens if you land and refuel during the trip?
5 votes
5 answers
3k views

How do you calculate trip fuel based on hourly fuel burn rates?

I am working on a small personal project that uses fuel burn data about specific aircraft to calculate the total fuel required for a trip. The data looks like this: ...
24 votes
11 answers
13k views

Why do piston engines in aircraft burn fuel at a higher rate than a comparable car engine?

I've never understood why piston powered plane engines burn such a large amount of fuel per time period than car engines. Can anyone elaborate on this? I know that a C172M will burn ~5-9+ gph at ...
6 votes
2 answers
600 views

Would it be feasible for a typical passenger jet to carry along its own Oxidizer?

We know that many Space Shuttles / Rockets etc. carry their own oxidizer with them. This is partly because at the heights they operate the atmosphere is too rarefied to have enough oxygen to sustain ...
0 votes
1 answer
691 views

What is the purpose of mixture control? [duplicate]

What's the purpose of mixture control? Is it to control the amount of fuel provided to the engine with which it is associated? If that's the case, what's the purpose of throttle lever then?
5 votes
2 answers
2k views

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, ...
7 votes
2 answers
2k views

What is the role of HP & LP fuel pumps in aircraft?

What is the role of HP (high pressure) and LP (low pressure) fuel pumps in aircraft like the A320? Why are two different ones needed?
0 votes
2 answers
345 views

At what point does a turboprop become more fuel efficient than a jet engine in large commercial aircraft?

Is there a formula that can be reliably used to determine when turboprops become the better option for domestic flights in a plane similar to a 737 in capacity and size? Also could this formula be ...
2 votes
2 answers
212 views

What section in the Federal Aviation Regulations deals with fueling commercial aircraft?

What section of the FAR deals with fueling commercial aircraft? I can't seem to find the section. Is is under ground handling? The actual process and safety, not the airworthiness of the fuel systems. ...
1 vote
1 answer
268 views

747 Fuel Drain Ports

I read about the fuel systems on aircraft for a project I'm working on, and I was wondering about the "fuel drain ports" mentioned, which the document stated were used for complete drainage ...
0 votes
3 answers
2k views

What happens if you put car gas in an airplane?

If I understand correctly, small planes like the Cessna 172 use 100 octane leaded gasoline with no ethanol. What would happen if you put regular unleaded car gas with ethanol in one?
8 votes
1 answer
2k 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 ...
14 votes
3 answers
6k views

Can a commercial airliner be too heavy to take off?

According to this question's answers, MTOW (or MTOM) is the Maximum Take Off Weight, which is everything up to and including trip fuel. Then there is one step above that, MRW, or Maximum Ramp Weight, ...
0 votes
0 answers
57 views

how can someone view fuel shortage alerts?

Quoting https://www.kvue.com/article/news/local/new-jet-fuel-tanks-at-austin-airport-will-be-built-as-planned-after-split-council-vote/269-d7490d00-01f7-4330-9026-71f619f7ad8b , Airport leaders have ...
1 vote
4 answers
1k views

Can I use unleaded fuel in PA-23 Piper Aztec?

Minimum octane to PA-23-250 is 91 octane as mentioned in the POH. Is there any option to add 95 unleaded fuel to my Aztec?
6 votes
1 answer
287 views

How is airline fuel hedging actually done?

When airlines refuel at the airport are they all billed at the same rate on the day? Similar to cars at a gas station? For example if Southwest has hedged and paying a dollar less per gallon than its ...

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