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Questions tagged [fuselage]

The main body of the airplane that holds the cargo and passengers.

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14 votes
2 answers
3k views

What is this strake near the nose of the MD-80 for?

What is this for on the MD-80? Is it a stabilizer?
11 votes
4 answers
8k views

Why don't Airbus planes have perfectly smooth front sections?

From time to time I like to watch a planespotting video and I must say that one tiny detail bothers me a slight bit. Look at this Boeing plane: And at this Airbus: In particular, examine the section ...
6 votes
3 answers
859 views

Why doesn't Su-57 blend the engine nacelles with the fuselage, like other 5th generation fighters?

All the current and upcoming 5th generation fighter aircraft have increasingly similar physical layouts regardless of their origin. This seems to be due to similar design choices around stealth and ...
6 votes
1 answer
865 views

What are the bulges (with what look like air intakes) on the lower fuselage of the An-22?

On both side of the lower fuselage of the AN-22 there are long bulges. While the undercarriage doors are visible, they only account for a small proportion of the length, making me doubt they're just ...
5 votes
2 answers
3k views

Why are 737 fuselages built in Kansas?

737 fuselages are built in Wichita Kansas and are transported by train to Renton, Washington, where the plane is assembled. Why outsource the fuselage all the way to Kansas? The cost of moving the ...
0 votes
4 answers
177 views

How much does the wing of a 6-seater plane weigh?

I could find plenty of information regarding the total weight (empty operating weight, maximum landing weight, and maximum takeoff weight) of every plane in commercial production. However, I could not ...
0 votes
2 answers
123 views

Is there a clear cut method for cutout on structural members?

I have been looking into fuselage cutouts especially, window cutouts on the skin panel for a school project. Reading Bruhn and Niu Books, both state that there are no clear cut methods for fuselage ...
0 votes
1 answer
259 views

Does the cross-sectional shape of a fuselage affect drag?

Comparing two bodies with the same streamlined longitudinal shape, and the same cross-sectional area, one with a circular cross-sectional shape, the other with a quadratic cross-sectional shape, ...
6 votes
2 answers
744 views

Why is the cross-sectional shape of some airliners' nose not perfectly a circle?

I found that the cross-sectional shape of some jet airliners' nose is not perfectly a circle. For example the Boeing 737 aircraft: (source: aeroprints.com via Wikimedia Commons, CC BY-SA 3.0) Look at ...
19 votes
4 answers
6k views

Why doesn’t lightning punch a hole in the fuselage?

Electric arcing creates a huge temperature in the air around it. When lightning strikes planes, why doesn’t this high temperature air melt/deform the aircraft skin? Also can these high temperatures ...
23 votes
2 answers
4k views

What is the weight saving of windowless fuselage for cargo aircraft?

What is the weight saving of a windowless fuselage for cargo aircraft? Does anyone have a rough estimation?
22 votes
4 answers
9k views

Why was the SR-71 made of titanium?

The temperature of the Lockheed SR-71 Blackbird's fuselage never exceeded 500 Celsius, which, to my knowledge, would be perfectly tolerated by stainless steel. So, why titanium?
20 votes
3 answers
3k views

Why don't airliner vertical tails extend to the very aft of the fuselage?

Looking at several modern airliners, the root of the vertical tail doesn't extend right to the aft-most point of the fuselage. This seems counter-intuitive given extending the tail further aft would ...
-3 votes
1 answer
196 views

What is a battery pod?

On a manual in school was written: 'The fuselage battery pod must be made in a metal to improve the impact resistance'. What is meant with battery pod here?
15 votes
1 answer
4k views

What are the two vents on the 777's left side behind the wing for?

— wikimedia.org; cropped Those have always caught my eye and I always dismissed them as equipment cooling vents. But, after finally remembering to check the flight manual, it turns out the equipment ...
15 votes
1 answer
555 views

What is the round tube mounted on the roof just behind the windshield of a PC-6?

If you look at the below image: (image source: Wikimedia Commons) There are three "antennas" mounted on the forward portion of the cabin roof. The two rear, wing-shaped ones probably are ...
1 vote
1 answer
288 views

Kinetic energy to perforate skin/fuselage of aircraft

I know that most aircraft have skins that are either aluminum or an aluminum alloy variant. I'm trying to figure out the minimal amount of kinetic energy that would be required for a projectile to ...
2 votes
1 answer
397 views

How much heavier will a fuselage be with a 10% increase in diameter?

Is there some kind of a ratio or a very general rule of thumb that describes fuselage weight increase in relation to the increase of its diameter? (All other things being equal, length etc.) Note: I ...
2 votes
1 answer
175 views

Is the fuselage of the CEA 311 Anequim configured as elliptical?

I am currently studying the effects of reduced drag induced by laminar flow on the subsonic aircraft. In order to complete that, I have believed I found the optimal fuselage which has the best ...
2 votes
1 answer
3k views

How should I decide on the type of stringer to be used in an Aircraft's wing and fuselage?

I am trying to add stringers on the skins of an aircraft's wing as well as fuselage, for the same reason why they are present in most of the aircrafts i.e. to resist bending (and a possible buckling ...
1 vote
2 answers
246 views

Why are liquids for cooling not allowed when drilling on CFRP/Al or CFRP/Ti stacks for aeroplane wings?

I recently did some research on the effect of cooling on CFRP/Al7075 drilling. 7075 is used for aeroplane main wing upper skin, and the plates need to be overlayed and drilled for flush riveting. But ...
10 votes
3 answers
38k views

How is a wing joined to the fuselage?

I've seen this video from Airbus: This is a capture from that video: What is the process for attaching the wings to the fuselage?
4 votes
1 answer
1k views

Would an oval fuselage fly as well as a round one?

I was looking at various planes, and was wondering why we don't have oval shaped fuselages instead of only round ones. Is there a reason? Perhaps aerodynamics, or stresses?
31 votes
4 answers
21k views

Why is the fuselage on an airliner circular-shaped?

Consider the fuselage of an A300. I have noticed this not only with airliners, but also for private jets and turboprops: why is the fuselage circular-shaped? Why don't aircraft have square-shaped ...
1 vote
2 answers
376 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?
0 votes
3 answers
496 views

Would a flying-wing drone fly farther if filled with helium?

I'm wanting to build a flying wing designed drone and I'm wondering if I were to fill the fuselage with helium if it would improve it's range.
3 votes
4 answers
1k views

Can an aircraft have a lifting fuselage that only generates lift at certain speeds?

I came across the blended wing body designs and their advantages etc. They are still very far from reality and require 20 more years till we see them fly. Isn't a conventional fuselage design with a ...
22 votes
1 answer
2k views

What is the shiny stripe around the aft wing–body fairing on an A380?

Source: planespotters.net: 1, 2 Regardless of the airline, that part is always unpainted, and in the right conditions, it looks shiny. From below the plane, it wraps around the wing–body fairing. Is ...
11 votes
1 answer
5k views

What are the random, differently-coloured rectangular patches on the top of this Boeing 737's fuselage?

The top section of this green-painted Boeing 737's fuselage was slightly faded and I noticed a few dark-green, rectangular patches on its top. They look like patch kits on a bicycle tyre's inner tube. ...
2 votes
1 answer
248 views

How can I modify a fuselage to increase the payload?

I'm designing a regional turboprop for a university assignment. The design requirements are very similar to the Dash 8 Q400 in terms of passenger capacity (90 pax), speed, range, runway length ...
0 votes
1 answer
338 views

How much aluminum was used in the Boeing 727?

What is the weight of aluminum used in the Boeing 727 fuselage? Do you know where I can find it? Any manual or site or something like that?
5 votes
2 answers
3k views

What are these "winglets" on the roof of the 737?

I circled the parts on the fuselage in red.
24 votes
2 answers
13k views

Why is the A380's fuselage designed with a flat bottom?

I want to know if there is some explanation for why the A380 bottom is flat instead of the oval shape, just near the wings.
12 votes
3 answers
3k views

Why did water come into USAirways Flight 1549 if an airplane is sealed and pressurized? [duplicate]

Airplanes are supposed to be air-tight and pressurized. However, when USAirways Flight 1549 landed on the Hudson river; water started to come into the airplane. How is this possible if the airplane ...
47 votes
4 answers
6k views

What is the offset in a seaplane's hull?

I noticed there is a little offset in a seaplane's hull (highlighted in the following picture). I suppose this is useful as it exists in all the seaplanes I know. It appears to be neither a ...
5 votes
3 answers
4k views

What is the section of the fuselage below the wings called?

Is there a specific name for the protruding section of fuselage beneath the wings? Im talking about the area where the landing gear bay often is. In the photo it's where the red Emirates logo is ...
4 votes
1 answer
460 views

What Is this on the fuselage of The Fokker F100? [duplicate]

What Is this on the fuselage of The Fokker F100?
31 votes
2 answers
7k views

What is the purpose of the glazed round area atop the Ju 87 Stuka G?

I haven't been able to find any pictures of this feature aside from models, nor any reference to what it is. I'm going to make a complete guess and suggest it's a searchlight for night-fighting to ...
6 votes
2 answers
2k views

Is there a parameter that links the areas of the fuselage and control surfaces? [closed]

Do aircraft designers look at the ratio of how much fuselage surface area can be loaded onto a given unit of wing and tail surface area including elevator, aileron, rudder etc? (Possibly, the surfaces ...
18 votes
2 answers
6k views

Why are the intakes of some fighters not attached to the fuselage?

Look at the photo below. As you can see the intake isn't attached to the fuselage. Why? Other examples include the F-16, F-22, and F/A-18 Hornet. (F/A-18E Super Hornet Walk Around)
13 votes
4 answers
5k views

Why does the DC-9-80/MD-80 have this cusp in its fuselage?

The fuselage of the McDonnell Douglas DC-9-80 (also known as the "MD-80") has a pronounced cusp at floor level, as can be seen in this diagram (courtesy of Boeing, eater of McDonnell Douglas - at ...
3 votes
3 answers
829 views

MD81: Why are there so many lights on the fuselage?

Looking at this photo I can see lots of lights on the fuselage of this MD81. It can't be a reflection, can it? Source: Airliners.net Why are there so many lights?
0 votes
0 answers
107 views

Wing fuselage joint in small aeroplanes [duplicate]

I know that there are bolts to connect the centre wing boxes of the fuselage and wings in large aircraft, but what are the methods of connecting the wings and fuselage of small aeroplanes? I’m mostly ...
10 votes
1 answer
7k views

What are the protrusions on the sides of the fuselage of the F-16I?

I've noticed that the F-16I has these protrusions on the sides of its fuselage. What purpose do they serve?
5 votes
2 answers
2k views

What was the first aircraft designed with a plug-system fuselage, and why?

Nearly all modern transport aircraft are designed with a plug-system fuselage, allowing longer and shorter variants to be built by adding or removing plugs. In addition, the plug system simplifies ...
9 votes
3 answers
4k views

What is the weight of the fuselage (only) of the Boeing 747?

I'm wondering about the weight of the Boeing 747's fuselage.
3 votes
2 answers
1k views

Why don’t double-bubble fuselages cause severe fatigue problems?

In response to my previous two questions about fatigue issues, or the lack thereof, generated by the cusps in double-bubble-fuselaged aircraft (Stratocruiser, DC-9-80), I received a number of answers ...
1 vote
0 answers
110 views

How much does (or can) the fuselage of a long aircraft flex?

How much will the unsupported ends of an airliner's fuselage droop in level flight? In turbulence, how much vertical movement will they experience relative to the wing? And finally, in extreme ...
6 votes
3 answers
866 views

Are commercial aircraft required to have the model number painted on them?

On a lot of aircraft, the model number / aircraft name is clearly marked somewhere on the fuselage, e.g. "Airbus A320". Is there any rule or mandate, that all aircraft must bear the model number at ...
6 votes
2 answers
1k views

What is the wingtip station number on a Boeing 747?

In the figure we can see the station line even though it is not clear. I'am using that picture just for an example to make the question clearer. Main question What is the station number for wingtip ...