Questions tagged [airframe]

The structure of an aircraft, including the fuselage, wings, and landing gear, but excluding the propulsion system.

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6
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2answers
157 views

What's This Cable Connecting Cockpit to Vertical Stabilizer in Air Tractor AT-401?

This is a picture of an AT-401 Sprayer Airplane I was wondering what's this steel-string stretching from cabin's windshield to the top of the vertical stabilizer ...
3
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2answers
192 views

What are the characteristics of the F-16 airframe lifetime?

What limits the lifetime on the F-16 airframe? I assume it is material fatigue, but what kind, and where on the airframe? Moreover, what exactly happens? What will happen if this problem is ignored? ...
4
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3answers
269 views

Do large non-pressurized metal planes have a maximum fatigue cycle?

For example the DC3. The way I understand it, the only thing that "ages" the airframes of DC3 is the landing/takeoff cycles and the accompanied periodic force loading/unloading. Do planes such as this ...
0
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1answer
312 views

What is the exact purpose of the string attached between front fuselage & the tail section of the transport aircraft's? [duplicate]

]2 228]3]3 Usually I got to notice a string attached between front fuselage to rear tail section of the transport aircraft's, what exactly might be the purpose or function of it? But comparatively, I ...
0
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1answer
405 views

Why is A320's CG optimum position at 25% MAC?

I have read a320's optimum CG position is 25% MAC. But, the aerodynamic center is also at 25% of chord. So since CG and aerodynamic center at the same position, there would be no moment arm of lift, ...
0
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1answer
98 views

Which pressure mode of operation has the most stress on aircraft frame

So I am want to know which mode of pressurization has the most demand on the airframe Isobaric mode constant - differential mode unpressurized I hope to get an answer because I have an exam and ...
4
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3answers
377 views

How does the wraparound wing design reduce drag?

How does the wraparound wing in this AOPA article reduce drag? One would think all that extra leading edge and surface area would make it worse. One more link also. The Parsifal Project has ...
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1answer
2k views

What is Waterline and why is it called so? [duplicate]

What is waterline and why is it called so? Is it same as fuselage reference line?
9
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1answer
1k views

Aside from the Stratolaunch, how many other aircraft have split bodies?

So there's a lot of excitement about the new (and massive) Stratolaunch Split bodies are uncommon (although launching spacecraft from them commercially is a new thing). The only other airframe that ...
5
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1answer
1k views

Why does the CF6/CFM56 Turbofan Fan Frame contain 12 circular holes between the primary and secondary flow?

This question is related to the answer I found on this particular thread, about the Frames in a Turbofan. In a turbofan what holds the spinning axis? I went on this thread after some research on ...
12
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3answers
2k views

Would an aircraft with no ailerons, no elevators and no rudders be safely flyable?

With contrarotative propeller (or not, if twin engine), cyclic and collective blade control. Would such an aircraft be safely flyable, and how efficient would it be, assuming it can have perfectly ...
26
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4answers
14k views

How thick is the skin of an aircraft like the Airbus A350 or Boeing B777?

We can evaluate how thick walls are by looking at door or window frames, however that isn't representative of an aircraft fuselage, which appears to be very thin: Airbus A350 XWB forward fuselage, ...
8
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2answers
3k views

How are flaps controlled?

I can understand what function(s) the flaps serve, but how are they controlled from an internal perspective? Does flipping the switch send signals to an electrical servo? Or is it hydraulics? How are ...
5
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1answer
796 views

What are these teardrop shaped thingamabobs on the bottom of the Panavia Tornado?

What are these two teardrop shaped thingamabobs on the bottom of the Panavia tornado? They could be hardpoints but I haven't found any photos where anything would have been mounted there. They don't ...
3
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3answers
2k views

What is the fatigue life of a fuselage based on?

The fatigue life of the fuselage is based on the number of what? Pressurization cycles?
16
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1answer
255 views

Are helicopters reinforced asymmetrically?

Helicopters are under a constant torque due to the action-and-reaction forces caused by the rotation of the rotor(s). In the tail rotor and tandem rotors configuration, the airframe is experiencing ...
9
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4answers
3k views

Do all aircraft need to have horizontal and vertical stabilizers?

Are (or were) there any operational aircraft that don't have horizontal and vertical stabilizers or canards? If so, what's the effect on how they fly?
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1answer
389 views

How reliable are aircraft cutaway drawings from Flightglobal?

I am working on a new system that would be retrofitted on jets (can't talk much about it yet), and I was looking for detailed drawings to start creating its detailed engineering design. I stumbled ...
3
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1answer
520 views

What are good study guides/practice tests for the airframe maintenance certificate? [closed]

I am approaching my 18 month mark on the job. Wanting to get my A license first. I have done all kinds of airframe work in this time period. Wondering if anyone has suggestions for the names of the ...
6
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1answer
382 views

What is the Effect of Unsynchronized Propellers?

A long time ago, I had the privilege of flying in 4 engine turboprop airplanes in which the props were 'synched'(blades rotating in same speed) which of course is necessary for smooth thrust. However,...
8
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1answer
433 views

What are the structural differences between short- and long-haul airplanes?

As I understand it, pressurization cycles introduce the most stress on an airframe so maintenance intervals are tied to it. However, not all planes are equal in that regard, a long haul flight in a ...
10
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1answer
654 views

What is the relation between geodesic airframe and geodesic curves?

That is certainly a beginner question but I cannot find the answer anywhere. The Wikipedia page on geodesics says that they are the shortest path between two points on a geometric object (surface, ...
8
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1answer
1k views

What methods exist to detect airframe icing, and how do they work?

What are the primary methods used to detect ice on an airframe, and how do they work on at least a high level?
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1answer
433 views

What is the maximum Mach number for a titanium aircraft? [closed]

What is the maximum achievable Mach number for a titanium aircraft assuming speed is limited by structural heating? The answer would be even better if there is a list of different materials and ...
5
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1answer
1k views

Why can planes generally take more positive g's than negative g's? [duplicate]

Most commercial airliners are rated to take +2.5g and -1.0g. Why is this? Is it designed that way on purpose? To clarify, this would mean that the cost difference between -1g and -2.5 g is ...
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0answers
238 views

Why is it that only light aircraft are equipped with airframe parachutes? [duplicate]

Why is it that only light aircraft (like Cessnas and Cirrus') are equipped with airframe parachutes? Isn't it possible for at least slightly larger aircraft to have this feature? And isn't there a way ...
17
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3answers
22k views

What is the purpose of a dorsal fin such as on the Boeing 737?

I've noticed that the 737 has a rather unusual vertical stabilizer, with an extension at the front. Is the 737 the only plane equipped with such a vertical stabilizer, and what is its purpose?
8
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1answer
6k views

Why is magnesium not used more often as a structural metal in aircraft?

Magnesium is lighter than aluminum for the same strength. If the answer is corrosion, how much work has been done to improve the corrosion resistance of magnesium? How much lighter would a magnesium ...
12
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5answers
7k views

Why are geodesic airframes no longer produced?

Why are geodesic airframes no longer produced? Do they cost more than conventional structures? Are they not as strong as conventional structures? I assume it is insufficient cost benefit ratio, but ...
8
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2answers
3k views

How well can an airplane which is tied down be protected from a blizzard?

I've been in the very early stages of shopping for my first single engine plane. That has made me more thoughtful about the environment in which a given plane is stored. So the recent blizzard in the ...
11
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7answers
7k views

What limits the lifespan of helicopters?

The lifespan of aircraft is generally limited by metal fatigue. This is true for fixed wing aircraft; is it also true for helicopters? What is the determining factor for helicopter useful life?