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Questions tagged [boeing-747-8]

For questions specifically about the Boeing 747-8 I or F models.

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2answers
276 views

What's on the upper deck in the picture (circled) of Cathay Pacific Cargo Boeing 747-8F? [duplicate]

Cathay Pacific Cargo Boeing 747-8F Image Source Is that a resting area for pilots or passengers seats?
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2answers
419 views

Could two GE9x engines power a 747? [duplicate]

These new GE9x engines are huge and extremely powerful, but could two of them power a B747–8? It is possible for some engines to power the original 741s but I am mainly interested in the B748.
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1answer
216 views

How much fuel is used for preheating the outer engines of a four-engine airliner that were not used for taxiing?

Many questions and observations here have highlighted the idea of using some kind of electric towing system for towing airplane to and from the runway, instead of using fuel to taxi. One of the ...
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1answer
654 views

Would the twin engine Boeing Y3 be able to compete better than the Airbus A380? [closed]

The low sales performance of the quad engine Airbus A380 and declining sales of the Boeing 747-800 have largely been attributed to lesser fuel economy of quad engine aircraft when compared to their ...
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1answer
298 views

What is the weight of the bulletproof cockpit doors of a Boeing 747?

What is the weight of the bulletproof cockpit doors of a Boeing 747 built prior to 9/11? Do the doors weigh the same for later models, like the Boeing 747-8 specifically? How many fewer passengers do ...
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0answers
51 views

What system is used to drive the control surfaces of airliners? [duplicate]

What system is used to drive the control surfaces, rudders, flaps and slats of the Boeing 747-800 and Airbus A380 and other modern airline aircraft? Is it a hydraulic or pneumatic system? Which is ...
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2answers
2k views

How large are the pilot rest areas of the A380 and B747-8?

How large are the pilot rest areas of an Airbus A380 and Boeing 747-8? What entertainment systems are found in them?
12
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1answer
4k views

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 ...
3
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1answer
301 views

Are nose wheel tyres designed differently from the main wheel tyres?

For the heavy large Jumbos like the Airbus A380 and the Boeing 747-800, considering nosewheel tyres are not subjected to the excessive heating caused by braking from the disks and brake pads, and ...
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1answer
421 views

Would installing 6 engines on an Airbus A380 and or Boeing 747-800 achieve a shorter take off distance?

Would installing 6 engines on an Airbus A380 and or Boeing 747-800 achieve a shorter take off distance? Would that result in excessive acceleration and harmful or uncomfortable G-forces? Would the ...
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1answer
180 views

does the compressor section of a jet engine creates a depression in front of it, due to air be sucked at a great rate [duplicate]

for large Jumbos like the Airbus A380 and the Boeing 747 - 800 at maximum thrust at take off, does the compressor section of a jet engine creates a depression in front of it, due to air be sucked at a ...
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6answers
4k views

Would increasing the number of wheels of a Jumbo reduce the braking distance?

If weight was not an issue, would increasing the number of main gear wheels on a jumbo such as the Airbus A380 from 20 to 40 wheels, each equipped with braking disks and braking equipment, considering ...
3
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0answers
428 views

What is the maximum weight on the main gear of a large aircraft at rotation and touchdown?

For a large aircraft like a B747 or A380, how much does the weight on the main gear increase when the nose gear is in the air? I mean, in these two cases: What is the maximum extra weight on the main ...
8
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1answer
456 views

Does the 747-8 / A380 nose-wheel encounter more weight during braking?

Given that the nose wheels of both the Boeing 747-8 and Airbus A380, as is true for almost all aircraft, are not equipped with brakes, do they encounter more weight during braking? If so, how much ...
3
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1answer
352 views

Can the bleed air for deicing the wings of the aircraft be switched on and off for jumbos?

Considering the large surface areas of the wings of the Boeing 747 and Airbus A380, can the bleed air for deicing the wings be switched on and off as needed and if so, is that automatic and where are ...
1
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1answer
372 views

What is the maximum temperature of engine bleed air for de-icing the wings?

What is the maximum temperature of the air bled from the engines of a Boeing 747-800 and an Airbus A380 to the wings for de-icing? If the air is too hot, how is it cooled?
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1answer
180 views

Would it be feasible to use graphene in the gearbox of a large turbofan engine?

What is the possibility or are the drawbacks of substituting graphene for metal in a gearbox of a geared turbofan the size of a Trent 900, given its strength properties(graphene), harder than a ...
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2answers
317 views

Can a turbofan maintain torque when spinning fast?

I assume turbofan fan rpm could be increased only when: Using most modern jet engines (Airbus A380 and the Boeing B747-800) Using a magnetic gearbox which can handle more torque dor the same weight ...
5
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2answers
455 views

Do airliners use light alloy wheels, like cars do?

Do large and small airliners - up to jumbos like the Boeing 747 and Airbus A380 - use light alloy wheels in their landing gear to reduce weight? If not, why not? Are there reasons unrelated to ...
11
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2answers
1k views

Can an airliner complete a flight with one pack inoperative?

I was travelling as a passenger on a 747-8. Around 5 minutes after we left the gate, the captain said we had to return to the gate due to "technical issues with the air-conditioning". The mechanic ...
1
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1answer
486 views

Where is the first Boeing 747-8 ever built stored at today?

I have tried many different ways to try to find where it is stored, but have had no luck.
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1answer
1k views

What are these strange blades behind the N1 fan in a Boeing 747-8 engine?

It looks like a second fan or something.
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2answers
3k views

What are the advantages of the B747-8 airfoil over B737's airfoil?

The Boeing 747-8 has a new airfoil design much different than a Boeing 737's airfoil. Boeing 737 airfoil: (source: How Airplanes Fly?) Boeing 747-8 airfoil: (source: Boeing) I am a little ...
16
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5answers
14k views

How many kilowatts to get an electric 747-8 airborne?

Reading about the Airbus E-Fan and it's dual 30 kW thrust fans caused me to wonder: assuming the need for four electric fans, how many kilowatts would be required to power each fan with enough thrust ...
5
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1answer
582 views

How much thrust do you lose by putting chevrons on a engine?

The chevrons on a 787 are there exactly to decrease a type of drag that makes the engine louder, but the chevrons form vortices causing more drag. How much thrust is lost from the vortices on the ...