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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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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: ...
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2 answers
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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 ...
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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 ...
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4 votes
2 answers
800 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),...
Luthfi Ahmad's user avatar
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 ...
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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?
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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 ...
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2 answers
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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 ...
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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 ...
Luthfi Ahmad's user avatar
2 votes
1 answer
339 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?
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8 votes
1 answer
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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 ...
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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 ...
matthias_code's user avatar
2 votes
1 answer
440 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 ...
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4 votes
1 answer
294 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 ...
uhoh's user avatar
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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, ...
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3 answers
570 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 ...
youngpilot's user avatar
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 ...
Elerium115's user avatar
3 votes
1 answer
208 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 ...
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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?
Wail Saifaldeen's user avatar
2 votes
1 answer
733 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?
boeing757_nz's user avatar
3 votes
0 answers
194 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 ...
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3 votes
2 answers
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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 ...
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1 vote
1 answer
338 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 ...
Tudor Ravoiu's user avatar
6 votes
1 answer
634 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 ...
Tudor Ravoiu's user avatar
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?
Someone's user avatar
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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?
Lelotz's user avatar
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0 votes
1 answer
686 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?
Kqt's user avatar
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2 answers
340 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 ...
fishbed's user avatar
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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?
Sachin Chaudhary's user avatar
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. ...
Mark's user avatar
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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?
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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 ...
neubert's user avatar
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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?
Segev Dagan's user avatar
1 vote
1 answer
267 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 ...
Adam's user avatar
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6 votes
1 answer
285 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 ...
rainhamtown's user avatar
3 votes
1 answer
743 views

Do airports commonly have mogas for sale on campus?

The ICON A5 POH gently implies, and other sources outright claim, that its Rotax 120iS prefers a diet of 87 octane mogas, and I've found a couple of sources claiming that while it'll take 100LL, the ...
William Walker III's user avatar
0 votes
2 answers
303 views

Could a Continental R-670 piston engine run with regular car gasoline?

I know that the minimum octane for the R-670 is 65 octanes (W670-K variant). I also noticed that other variants increase compression ratio and power using a minimum of 80 octane. Why there is an ...
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6 votes
1 answer
3k views

What should I do if I get a fuel vent blockage in flight?

I'm flying C172s, and I have a question. During flight if a fuel vent (located on the left side) becomes blocked due to a bird strike or icing what should I do? Are there any auxiliary fuel vents?
바오밥나무's user avatar
9 votes
4 answers
2k views

Are there ways to avoid using leaded fuel in older aircraft?

What options are there for those with older planes that require leaded fuel? Is there a relatively easy fix so that leaded fuel isn't necessary?
Indelible Snarf's user avatar
-3 votes
1 answer
132 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 ...
mandiokai's user avatar
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11 votes
3 answers
4k views

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 ...
Konrad's user avatar
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-1 votes
1 answer
184 views

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. ...
JVDA40's user avatar
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6 votes
2 answers
3k views

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 ...
uhoh's user avatar
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7 votes
4 answers
5k views

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 ...
Bilal Mirza's user avatar
0 votes
1 answer
584 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 ...
Davidw's user avatar
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2 votes
2 answers
349 views

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 ...
Urquiola's user avatar
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7 votes
1 answer
657 views

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 ...
Isaiah Taylor's user avatar
11 votes
5 answers
2k views

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 ...
William Walker III's user avatar
9 votes
3 answers
3k views

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?
Enes Senel's user avatar
7 votes
1 answer
5k views

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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