友基数位板驱动(友基手绘板驱动) S1.4.0官方版
百度 踹门一脚利器更要成为坚强战士歼-20，由中国自主研制的新一代隐身战斗机，那么未来如何在战场上发挥顶尖装备的作用呢？有网友称歼-20可以凭借隐身的能力摧毁地方的雷达，踹开敌人防御的大门。
A measurement of vertical distance. Usually measured at either Mean-Sea-Level (MSL) or Above-Ground-Level (AGL).
265 questions
8
votes
2
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If DA is barometric altitude, why does VNAV have higher minimums than precision approaches?
As I'm studying for my instrument checkride I realized there's something I don't get about decision altitudes. IIUC, you get a DA on an approach with an official glideslope. These glideslopes are ...
- 661
-4
votes
2
answers
226
views
Why are we using Barometric pressure and altimeters instead of WAAS GPS and ADS-B to avoid aircraft collisions
I fly single engine aircraft and fly in mountainous terrain. My aircraft is equipped with both standard altimeters and WAAS enabled GPS mated to a ADS-B unit. I have often noticed a discrepancy of as ...
6
votes
1
answer
2k
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How does the air traffic control (ATC) monitor aircraft altitudes on their radar screen?
I am trying to understand some radar screen video I saw in an article (Video Credit: X/@RepThomasMassie):
I am not sure where the altitude information is.
The text in the following video frame is, I ...
- 1,571
0
votes
1
answer
273
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Estimating Helicopter Altitude Above Me Based on Webcam Triangulation?
I believe I have police helicopters that like to buzz around at altitudes of about 500', in a town-like area. If this happened once a day, it wouldn't be a big deal, but it happens more like once an ...
- 259
2
votes
2
answers
287
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Why does flying at higher altitudes generally improve fuel efficiency for commercial airplanes given Specific Fuel Consumption rate (SFC)? [duplicate]
I’m a high school physics student with an interest in aviation and would like to understand why commercial airplanes fly at high altitudes (e.g., 35,000 feet) to improve fuel efficiency. My ...
0
votes
1
answer
120
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For a modern Turboprop/Jet will going at 300/400 mph TAS at 10000 feet require more thrust/use more fuel per unit time vs going 600mph at 30,000 feet?
My understanding is one of the primary reasons why modern planes Cruise at around 30,000 to 40,000 ft is because of the lower air density less results in less drag. So for a given thrust, an airplane ...
3
votes
4
answers
2k
views
Why do commercial jets fly so high? [duplicate]
Everyone ever heard of a plane knows they usually go quite high into the atmosphere. To my knowledge, this is to help the plane go faster in low atmospheric densities and reduce aerodynamic drag. But ...
- 444
11
votes
4
answers
4k
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What is the most fuel-efficient flight profile for a small plane?
If you take a short one hour flight in an A320, the flight will usually climb to around 25 - 30,000ft and then descend into its destination. The actual cruise at 30,000 will often only be a matter of ...
- 14.9k
-7
votes
1
answer
272
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At what altitude will an explosive depressurization cause structural failure?
Rapid depressurization at high altitude is generally a very, very bad thing, because the aircraft will quickly loose altitude and may suffer damage to vital areas. There are three forms of ...
- 1,654
1
vote
2
answers
163
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Temperature change & Altimeter indication
Ref: FAA Pilot's Handbook of Aeronautical Knowledge 2023 (faa-h-8083-25c)
Page 8-4, column 2, paragraph 3 (including figure 8-3) through page 8-5, column 1, paragraph 1.
As a background to my ...
- 13
0
votes
1
answer
235
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Why is MH370's location data from the Malaysian military considered reliable if the altitude data isn't?
This is another question originating from the video "The Vanishing of Flight 370", by Lemmino.
At 13:52 he says
The data recorded by the Malaysian military ...
- 339
6
votes
3
answers
392
views
ADS-B - Measure distance from position on ground to an aircraft
I have a docking station for autonomous drones in the field. It is equipped with a Raspberry Pi, an 1090 MHz ADS-B stick, and it knows it's geometric position from a previously done precise ...
- 181
5
votes
1
answer
188
views
Does one need to make temperature corrections for airspace avoidance?
This answer claims that airspace boundaries are based on true altitudes, not any particular altimeter setting. But temperature errors can cause indicated altitudes to vary wildly from true altitudes.
...
- 19.4k
3
votes
1
answer
527
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Max Range Relationship to Altitude for Propeller-Driven Aircraft
Chapter 11 of the PHAK states, "If a change in altitude causes identical changes in speed and power required, the proportion of speed to power required would be unchanged. The fact implies that ...
- 629
0
votes
0
answers
75
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Calculating True Altitude from ADS-B Data [duplicate]
I am working on a project and need to determine the altitudes of airplanes (trying to determine when they are landing/doing a touch and go).
I have an ADS-B receiver receiving data from the airplanes.
...
