Questions tagged [high-altitude]

Regions on or above the earth's surface located at least 2,400 meters (8,000 ft) above sea level.

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36
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5answers
6k views

How does an airliner deal with cabin altitude at an airport above 8000 ft?

There are a number of airports above 8000 ft altitude. FAR 25.841 states: Pressurized cabins and compartments to be occupied must be equipped to provide a cabin pressure altitude of not more than ...
15
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3answers
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What are the limiting factors for high altitude planes (e.g: U2 or SR71) preventing them from going higher?

I'm curious as to why planes like the U2 Dragon Lady and the SR71 Blackbird couldn't fly higher. What physical constraint set their operational ceiling? Pilots wore spacesuits, so that wasn't the ...
18
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3answers
4k views

Is there a height limit to national airspace?

Given the following facts: satellites can operate at an altitude of 200km without triggering frontier violation incident aircraft can trigger diplomatic protestations if they cross a frontier at an ...
16
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5answers
10k views

Are sun's UV rays more harmful on an airplane at high altitude?

Most airplanes fly at >30k feet, way into the stratosphere / mesosphere where sun's UV rays aren't filtered by lower atmosphere layers. If the windows of the plane are open and the sun is shinning ...
16
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3answers
46k views

Can commercial airliners fly over hurricanes?

When Patricia was making landfall yesterday I opened up Flight Radar 24 to see if there were any planes flying around or near it. As I had expected, there were a couple of storm watching planes near ...
3
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1answer
587 views

Why does aircraft stability increase when it transitions from subsonic to supersonic flight?

I am puzzled why would the aircraft be more stable at high speed flight at high altitudes. Given that the Centre or Pressure moves gradually towards the 50% MAC region, once past Mcrit. Has this got ...
6
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2answers
4k views

How are aircraft separated at high altitude?

When cruising at high altitude, a fixed-wing aircraft has less margin for adjusting its speed, due to the convergence of the stall "speed" and the overspeed limit: If and aircraft has to be separated ...
5
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2answers
2k views

Is there a maximum airfield elevation in which a Cessna 172P can operate?

The title says it all: is there a maximum airfield elevation in which a Cessna 172P can operate? Or a maximum density altitude at which take off shouldn't be considered?
9
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2answers
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What keeps an aircraft engine from flaming out at high altitude?

High altitude atmosphere has lower oxygen level. How do aircraft, especially the military ones, prevent engine flameout?
6
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2answers
557 views

If maximum speed was a priority for modern military fighter jets and bombers, approximately how fast would they likely be?

Burt Rutan talks rather passionately about the lack of innovation in space flight, but also mentions how fighter jet (maximum) speed performance has stalled: In fact,...
5
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4answers
698 views

Can a light glider without thermal protection land from the orbit, starting from the orbital speed?

I ask about a glider without any special thermal protection (pilot in the space suit), so both answers to the other question do not cover the topic. When the glider enters the atmosphere, it starts ...
4
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2answers
363 views

What kind of drone might be able to fly so high that it “operate(s) outside national boundaries”?

In the question What is a propellant burner trailer? I mention that CNN and NPR have pointed out that the US president recently tweeted a surveillance photo of an explosion of a rocket on a launch ...
3
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2answers
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What are the ground and flight requirements for high performance endorsement?

I'm told ground is proficiency based but that in the plane you have to fly up to 25,000 feet! I don't know anything short of a turboprop capable of doing that, let alone have the ability to rent it. I'...
9
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2answers
813 views

Are there any aircraft designed to operate between an altitude of 50-80km?

Aircrafts operating at high altitude falls into several categories: Wings with high aspect ratio (Global Hawk, TR-1, Scaled Composite Proteus,...) High velocity aircraft (Concorde, A-12, X-51,...) ...
4
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4answers
829 views

Is it possible for a modified hang glider to land safely coming from orbit? [closed]

Can a glider be dropped from geosynchronous or other orbits and safely land?
3
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1answer
1k views

Is there a limit to the possible altitude for electric jets?

So I was thinking about Elon Musk's supersonic electric jet idea. Assuming we have sufficiently energy-dense batteries, where would the limits be in terms of speed and altitude. His logic seems to ...
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1answer
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How does altitude affect sound? [closed]

So I know that altitude affects the speed of sound because of temperature differentials in the atmosphere, but I am curious what else affects how we hear planes overhead? When a plane flies overhead, ...