Questions tagged [fuel-tanks]

Large cavities that store fuel, typically in the wings and/or belly of the plane.

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17 votes
1 answer
8k views

Do tanker aircraft distribute their own fuel?

Do tanker aircraft, (such as the KC-135, KC-10, S-3B, etc), distribute fuel from their own fuel tanks, or is it strictly from a separate cargo tank? Obviously, some cargo tanks are going to be ...
0 votes
0 answers
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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
1 answer
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Understanding fuel tanks/pumps of Fighter jet

I have observed fighter jets performing maneuvers like inverting, Turing around in sharp angles etc. This may subject plane to G forces and other dynamic forces. How does fuel tank ensure steady ...
17 votes
1 answer
2k views

When drop tanks (those with external lines) are released, how are the two connections (air and fuel) released?

ww2aircraft.net Say in a P-51 (shown above), when drop tanks (those with external lines) are released, how are the two connections (air and fuel) released? Do they shear off and fall with the tank? ...
6 votes
1 answer
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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?
9 votes
2 answers
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Why was the B-52's wet wing more susceptible to fatigue than its dry wing, and not less?

After years of carrying all its fuel in the fuselage, the B-52 transitioned to a wet wing (where the wing structure is used as one or more fuel tanks) with the B-52G. This caused severe problems with ...
-1 votes
1 answer
151 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. ...
6 votes
2 answers
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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 ...
16 votes
2 answers
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Is the entire length of a B747 or A380 wing used as a fuel tank?

It is generally understood that the fuel tanks of aircraft are in the wings, but specifically, is the entire length of the the wing of: an Airbus A380 Jumbo used as fuel tank? a Boeing 747-800 Jumbo ...
1 vote
0 answers
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Where are the small fuel reservoir tanks on a Cessna P210N?

I have looked through the POH and the maintenance manual of the Cessna P210N, both said that the fuel goes from the main tanks into two small reservoir tanks somewhere on the lower side of the ...
14 votes
4 answers
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How are wing tanks sealed around the internal wing structure?

I can easily grasp the idea of tanks of fuel inside the fuselage of an aircraft, and the ease of sealing such tanks in a relatively standard shape. However, I'm having a hard time understanding how ...
0 votes
1 answer
124 views

What extra components does a fuel tank have?

For small-to-mid-size aircraft like V-280, and gulfstream aircraft, what component does their fuel tank has when it arrives for assembly? Is it just a metal box with valves? Or it contains heating ...
3 votes
0 answers
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Which was the first aeroplane to have fuel tanks within its wings?

Wings with substantial thickness start appearing after WW1, with Junkers pioneering all-aluminium aircraft such as the Junkers F 13 (1919). It as a far from universal trend, however; compare with the ...
9 votes
3 answers
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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?
2 votes
2 answers
503 views

Use of a solenoid valve over a selector valve

When designing a low-wing light aircraft with two integral tanks at the wings and a collector tank in between, what type of valve should be used to allow the pilot to select the integral tank which ...
3 votes
1 answer
415 views

Did WW2 airplanes ever jettison their empty external fuel tanks to act as weapons?

Jettisoning an external fuel tank over a populated area is prohibited by the FAA as it will almost certainly cause injury and damage to the people in that area. But did war airplanes during World War ...
1 vote
2 answers
242 views

What is the structural impact on the wing if no fuel is stored in the wings and just in the fuselage?

What is the structural impact on the wing if no fuel is stored in the wings and just in the fuselage and how to counter possible advantages/disadvantages? Has this topic already been researched?
7 votes
1 answer
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Why do aerobatic aircraft have separate tanks instead of a single acrotank?

I've been reading about fuel tanks in aerobatic planes such as the Extra 330, Edge 540, XA41 and I don't really understand why in the Extra 330 there are separated center tanks and an acrotank instead ...
15 votes
5 answers
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What could the fuel pump failure have been that my flight experienced?

I was on an Easyjet flight (I think an A320), when mid-flight, I overheard a member of cabin crew tell another passenger there was a 'technical' issue with the aircraft, that might make us slightly ...
0 votes
1 answer
207 views

How large are the CF-100 Canuck wingtip fuel tanks?

How big are the CF-100 Canuck's wingtip fuel tanks and what is the maximum fuel capacity they can carry?
13 votes
1 answer
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How were the fuel tanks sealed on the XB-70 Valkyrie?

The Valkyrie flew at Mach 3.1, close to the SR-71's operating speed in cruise. For the SR-71: Fuselage panels were manufactured to fit only loosely with the aircraft on the ground. Proper alignment ...
6 votes
1 answer
684 views

How is fuel drawn from drop tanks in WW2 airplanes?

Low-wing tanks typically have fuel supply lines at the bottom. For external drop tanks, I thought they came built with internal lines that mate with the plane. That appears to be the case for ...
0 votes
1 answer
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How do fuel tanks prevent free surface effect? [duplicate]

Free Surface Effect is a fancy term that refers to liquids changing their relative orientation within a container, whenever the container is rotated. So imagine a large plane banking very steeply, at ...
7 votes
1 answer
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How is fuel removed from a light aircraft if required for weight and balance?

With small, light aircraft, weight is always a consideration. Say you had a four-place single engine aircraft that you wanted to take yourself and three of your (non-FAA-standard weight) friends, but ...
11 votes
1 answer
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What is the capacity of the vent surge tank in an A320?

If the wing tanks of an A320 are fully filled and the fuel expands due to high temperatures then the fuel overflows into the vent tank. My question is, does the fuel get stored in the vent tank? If ...
11 votes
4 answers
3k views

Is there any work on improving fuel tanks so they could store hydrogen?

I think that hydrogen is among the best fuels for use in supersonic and hypersonic flight, is there any work on improving fuel tanks so they could store hydrogen? What would be the best state to ...
2 votes
2 answers
549 views

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-...
6 votes
4 answers
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Would hydrogen fuel tanks on an airplane increase lift?

Since hydrogen is lighter than air, would hydrogen fuel tanks help provide lift for the airplane?
4 votes
1 answer
769 views

Where are the fuel tanks located in an Antonov An-225?

Does anyone have answer for where the fuel tanks are located on the Antonov An-225? (photo attached for explanation if anyone could) Would love to know how many tanks are on the aircraft and how the ...
8 votes
2 answers
25k views

Why do planes have cross-feed switches or circuits?

Why do planes have cross-feed switches or circuits? Are they to move contents of one tank to another (feed the tank) or to supply the engine with fuel from left side to right or vice versa (feed the ...
0 votes
2 answers
995 views

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?
15 votes
2 answers
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What are the pros and cons of wingtip tanks?

I am looking into the aerodynamic pros and cons of wingtip tanks. Let's assume they're perfectly streamlined, optimally placed and sized for a given airframe. I am aware of the purpose of fuel ...
0 votes
0 answers
178 views

May an A330 depart with with empty outer fuel tanks?

Airbus does not recommend flying with empty outer tanks, to reduce stress on the wings. Also, when the outer tank transfer valve is inoperative, the MEL says to fill the outer tanks with fuel and it ...
54 votes
9 answers
43k views

Why are fuel tanks located in wings?

Passenger aircraft have fuel tanks in the wings. Why? What are the advantages and disadvantages of this location ? examples of disadvantages I would suspect: added weight increases the structural ...
25 votes
3 answers
4k views

What sort of debris has been found in 737 Max fuel tanks?

There have been numerous reports of Boeing finding "foreign object debris" in the fuel tanks of its 737 Max airliners. It's not clear what this debris is. It could range from a couple of missing ...
3 votes
1 answer
48k views

How much fuel does an A380 hold and where?

How much fuel does an A380 usually carry (in litres) and what is the maximum? How much is in each wing? How much is in other fuel tanks and where are they?
1 vote
1 answer
907 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?
10 votes
2 answers
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What to do with excess fuel before flight?

I've read that it's recommended to store a plane with full fuel tanks to prevent water contamination. Some small general aviation planes, however, would exceed their maximum gross take off weight ...
10 votes
1 answer
89k views

What type of fuel is used in helicopters?

What type of fuel is used in helicopters? Do they use Aviation Turbine Fuel (jet fuel), which is used widely in commercial airlines? Also, where would be the fuel tank located in a helicopter?
8 votes
1 answer
4k views

What is trimming the fuel tank?

In a recent news article on an Airbus A400M crash, it has the following line: Sources have told Aviation Week that aircraft MSN23, destined for Turkey, featured new software that would trim the ...
2 votes
1 answer
826 views

Why did Lockheed Martin give the F-22 stealth fighter such small fuel tanks?

Why did Lockheed Martin give the F-22 stealth fighter such small fuel tanks while the F-35 got much more fuel capacity relative to its size and single jet engine?
13 votes
2 answers
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Was there a design flaw in the fuel tanks of the MiG-15/17/19/21?

Wikipedia article on MiG-15: Another major design deficit was that the tank could develop under-pressure if more than half the fuel had been used, which could easily lead to tank implosions, ...
0 votes
2 answers
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Why are tip tanks used? [duplicate]

The answer to this question identifies the "pods" as tip tanks. Why do manufacturers sometimes use tip tanks rather than wing tanks? Or is it only when the wing isn't large enough to hold the desired ...
8 votes
3 answers
2k views

Can fuel be stored in the anti-shock bodies?

lets say an airplane needs to get to a certain route but doesnt have the fuel to do and it needs to store in the anti-shock bodies. Is it possible?
2 votes
2 answers
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Would it have been feasible to install 'conformal fuel tanks' on the Mercure?

The Dassault Mercure was a short-range twin-jet airliner. It was canceled with sales not reaching the breakeven point. Other similar jetliners like the Boeing 737 had a more convenient longer range. ...
12 votes
4 answers
2k views

Can we eliminate the center tank of large passenger planes?

This is a safety question about fuel and fires. This all regards commercial aviation for large passenger planes. Most fuel is stored in the wings, but in the largest planes, there's also a center ...
3 votes
4 answers
479 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 ...
2 votes
0 answers
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Are there design guidelines for sizing vent/surge tanks?

Could someone explain the sizing process of Vent/ Surge tank of Aircraft fuel system? I understand the Vent tank is to collect fuel overflow from the main fuel tanks. The reason could be due to Fuel ...
1 vote
1 answer
209 views

Where are the fuel tank sumps on an Aquila A210?

When I drain the fuel I have to do it three times: In addition to the drainer openings on both undersides of the wing and under the front fuselage (3 times in total). Can you tell or show me where ...
2 votes
1 answer
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How does switching off pumps and putting on MAN switch resolve low pressure?

FUEL If the center tank is less than 200 kg (440 lb) for the flight: Apply the following procedure, if your airline is affected by FUEL CTR TK PUMPS LO PR cautions on ground or in flight when the ...