All Questions
24,980
questions
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Does the flow over a wing decelerate upward, like air decelerates sideways with a swept wing?
In this answer, it states that the deceleration of air in the region of pressure rise over a wing acts in a direction perpendicular to the lines of relative chord, explaining how spanwise flow is ...
- 435
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votes
0
answers
35
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What do the Tail Rudders do specifically? [duplicate]
What do the tail rudders actually do on airplanes; fighter or commercial? Do they stabilize, turn, or something else?
- 21
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0
answers
54
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Do aircraft depressurise when taking off from a high elevation airport? [duplicate]
A jet aircraft generally maintains a cabin pressure of 7000-8000 ft during cruise. If the aircraft departs from a high elevation airfield, such as Quito (approx. 10,000ft), will the aircraft ...
- 453
-1
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0
answers
47
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How would I certify my amateur-built plane in the USA?
I have built multiple planes, all amateur-built. I have recently moved to the United States, so I have no knowledge on how to make it certified with the FAA.
- 1
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3
answers
73
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What determines the name of the runway if it is not active (for atc instructions)
I was not succesful with finding an answer to this anywhere on the web. Let’s assume we have multiple runways in the airport and ATC controller gives us instructions to cross certain runway that is ...
- 101
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votes
1
answer
22
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Can I get a UK Civil Aviation Authority (CAA) issued Class 1 medical with monocular vision?
I was born with no central vision in my right eye, and I would like to know if this would hinder my ability to become a commercial pilot.
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votes
1
answer
24
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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 ...
3
votes
1
answer
37
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Rules upon accessing the aircraft after emergency landing
The question is inspired by the recent emergency landing of Ural Airlines Flight 1383. Please correct me if it belongs to Aviation.SE or other site.
An aircraft performs an emergency landing somewhere ...
Ivan Smirnov
1
vote
1
answer
39
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Effects of lead on engines and engine oil
I'm aware of the issues of spark plug fouling and lead deposits that tetraethyl lead can have on an aircraft engine, but what effects do lead and its compounds (metallic Pb, PbO, PbCl2, PbBr2) have on ...
- 189
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votes
1
answer
577
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Can doppler radar be used to detect stealth aircraft by focusing on the characteristic flow field instead of the aircraft itself?
Any aircraft traversing through the air would impart velocity, pressure, and temperature gradients to the surrounding air, then there are some phenomenon which are unique to all winged bodies such as ...
- 399
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votes
2
answers
77
views
How large do wings have to be to create lift?
How much lift is needed to get an aircraft in the air? Is there a specific formula? And also what wing shapes offer different types of lift? I.e a delta wing formation.
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1
answer
138
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What is the seaplane in this old photograph?
Can you help identify this large apparently water-borne machine?
- 541
10
votes
2
answers
1k
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Being sent away from an airfield - could I have asked more questions?
On the weekend I visited an airfield (it IS inside an ATZ) that has a PPR section on their site. I've previously called ahead on the radio for PPR.
Anyway I called them on frequency 10 miles out and ...
- 12.6k
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votes
1
answer
44
views
Over which types of ground surfaces do we have more updraught?
When a light airplane is flying around 2000-3000 ft AGL, over which places will it deal with updraught more?
- 123
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votes
1
answer
74
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What is the difference between VMO and VNE?
What is classified as a low/ moderate/ severe exceedence? Is it based on a %?
0
votes
1
answer
73
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How do after-burners work on jet planes?
I've always wondered this after getting introduced to fighter jets, the sheer concept of being able to create a larger "exhaust" out of a fighter jet and cause it to speed up has always just ...
0
votes
1
answer
52
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How do I get rid of this weird line along the x-axis when importing an airfoil into XFLR5?
Whenever I try to import an airfoil into XFLR5, I always notice this weird line along the x-axis as you can see in the picture.
Is there a way to somehow get rid of this line?
I'd be thankful for any ...
2
votes
3
answers
129
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How do you make sonic booms quieter
I was looking through several sources and I can’t find anything explaining how sonic booms can be muted. In the Lockheed Martin Quesst experimental airplane info it states that it supposedly has a “...
- 21
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1
answer
45
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Exhaust temperature of CFM56 engines range (Nozzle downstream temp)?
EGT is available but not the temp of the exhaust nozzle in the CFM56 series.
- 1
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1
answer
55
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what is the difference between RVR 200m and R 200m (LVO jeppesen landing minima)
sometimes JEPPESEN approach chart shows low visibility landing minima as RVR in meter or sometimes just R in meter. What is difference….
- 109
13
votes
5
answers
3k
views
Why isn't the rudder below the tail?
Most airplanes have a rudder on top of the tail. When it is turned to the left, it causes the plane to yaw to the left. But it also puts a roll force to the right, because it is usually above the ...
- 133
1
vote
1
answer
43
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MAP in profile view of approach plate
I understand that the start of the dotted arrow on the profile view of an approach plate shows the MAP for the precision approach on a plate if the plate combines more than 1 (for example, a plate ...
- 121
1
vote
1
answer
100
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Why is spanwise flow more prevalent in the boundary layer?
Spanwise flow is stronger in the boundary layer, but to me it's kind of counterintuitive because the BL flow is slowed down by friction, experiencing less of a pressure gradient over the wing, ...
- 435
2
votes
2
answers
140
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767 fuel line issue
Recently flew a 767 that needed to turn back after about 45 minutes b/c, according to the pilot, fuel was only being pumped from one tank, which could lead to an imbalance if left to continue.
...
- 233
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votes
1
answer
45
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What's the most cost-effective way to get a group to get their Junior HPR Level 1 certification?
I'm apart of Civil Air Patrol and trying to get other cadets to get their Advanced Rocketry certificates, but the Challenger (Stage V) phase requires a completion of a NAR Junior HPR L1 certification.
...
-1
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0
answers
47
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IFF Planar Array [closed]
I'm trying to develop a new IFF planar array for ATC. Anyone can suggest design calculations, factor and antenna type which is suitable for it?
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1
vote
1
answer
63
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Data for mapping a past flight?
Is there a website that shows past flight tracks of a few days back? tells how to use FlightAware to see a past flight on a map. But is there any public source of times/coordinates for past flights?
...
- 247
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2
answers
146
views
What authority does the owner of an aircraft have as a passenger?
If Alice, who owns an aircraft and may or may not be a certificated pilot, flies in her plane as a passenger with her friend Bob as PIC, what authority, if any, does Alice have over the flight that an ...
- 6,564
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1
answer
43
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ILS Frequency Assignment In Dual Nav Radio Setup
With a dual Nav radio setup (On autopilot panel) does the ILS frequency of the runway you're about touch down on need to be entered into both radios or just one? Cheers.
5
votes
1
answer
373
views
Did SR-71s have a switch for seat height adjustment for the pilot or were there strict height requirements in order to fly it?
I've realized that nowadays there are switches present on most modern aircraft which electrically adjust the height of the seating position, and I was wondering if that mechanism was present on the SR-...
- 135
4
votes
1
answer
201
views
If I own land, can I create a private helicopter landing spot for my personal use?
If I own land(in the U.S.), can I create a private helicopter landing spot for my personal use? Would I have to register with the FAA or some other government agency?
4
votes
3
answers
2k
views
What is the effect of wind on altimeter reading?
I am wondering is there any effect from wind on the altimeter reading?
I think when the wind is blowing, the static pressure around the aircraft in flight will somehow change and this can impact the ...
- 123
5
votes
2
answers
405
views
What is the heaviest Single Engine Prop Plane that has been flown?
What is the heaviest single engine propeller-driven fixed-wing aircraft that's been produced & actually flown?
Experimental and one-of-a-kind aircraft count, as long as it has actually flown.
The ...
- 49.8k
-1
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0
answers
42
views
Design Airbrakes Area (or choose) for Sailplane
I'm trying evaluate what airbrakes shape (area) need a sailplane to flight into thermal in minimun sink or approach.
The main idea was to iterate adding drag with different flat plates (or more ...
- 113
7
votes
1
answer
2k
views
How big would a single propeller need to be on a 737?
If you wanted a 737 to have the same design as a single prop light aircraft (i.e. just one prop on the nose, no turbines, APUs or other engines) - how big (and how fast) would the propeller have to be ...
- 12.6k
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votes
1
answer
107
views
Yawing during turns
This is a question about aeronautics. Does an airplane yaw while it is turning?
3
votes
3
answers
675
views
Minimum Sink Rate in Sailplane
How do gliders ascend (either with an engine or thermal) at best rate of climb if it is very close to stall? Or they move up by sacrificing that best Rate of Climb. In image the best CL^3/CD is ...
- 113
1
vote
2
answers
114
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What does the FAA define as an "Aeronautical feat"?
I got interested about 49 U.S.C. § 44724, which arose following the death of a 7-year-old pilot attempting to set a record. The new law says:
... the individual is attempting to set a record or ...
- 4,913
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1
answer
67
views
Entry to back-side of power curve
When entering slow flight, when do we enter the back side of the power curve? Is it when we reduce the throttle or when the airspeed decreases to just above 5 knots from the stall speed?
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19
votes
3
answers
6k
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90 minute youth activity, what to do?
This is a bit of an open ended question.
Every year or so, one of the youth groups associated with local churches will want me to come and do some evening youth activity with them about aviation/...
- 693
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1
answer
120
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What is 1950 Military Aircraft Blueprint to Aluminum Sheet Metal Process Called?
I have sections of vintage aluminum sheetmetal with aircraft 'blueprints' stenciled, what is this process called?
One plane is identified as a F9 Cougar (plane outline shown), others have earlier font ...
0
votes
1
answer
56
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Flying your own trips part 91 if your jet is on a part 135 certificate
If an individual owns a business jet and places it in an LLC, then in turn places it on a part 135 operator’s certificate, can that individual fly his own trips under part 91?
4
votes
1
answer
837
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What is ACS on a magneto switch?
I was looking at a magneto switch and the text ACS below attracted my attention. What is its meaning and function?
- 123
1
vote
1
answer
106
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How long can a foreign registry glider stay in the US before having to change the register to N or having to leave the country?
This is a qualification on a previous question, specifically for gliders.
Here is the link to the answer to the more generic question. Juan Jimenez thanks for the answer there.
As other sources ...
1
vote
0
answers
41
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Gulfstream IV-SP Not Sending POS INIT to IRS 3
After powering up and starting up EFIS/ICAS, starting up both FMS’s, I try to POS INIT the IRS’s, but the IRS in position 3 does not receive a position. It’s like it’s on and waiting for it, but it ...
- 11
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1
answer
37
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Are there any sources that contain information on the airfoils of the Boeing 737-500 and 737NG Aircraft?
I have found some information about this on airfoiltools.com (http://airfoiltools.com/airfoil/details?airfoil=b737a-il) but it doesn't specify the exact version of the aircraft, as the generations ...
- 1
5
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4
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1k
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Could the folding wingtips of a plane (ex. F-35C) be used as a vertical stabilizer?
In the rare event of the vertical stabilizers being ripped off and the rest of the plane surviving, could folding wingtips (given they are far enough behind the CoM to create a stabilizing moment) be ...
- 435
3
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2
answers
482
views
Why does the nose pitch up during power reduction in a T-tail with rear mounted engines?
For the CRJ700 for example, reducing thrust causes a pitch up. Why is that?
- 31
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2
answers
1k
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How diesel fuel is injected into the cylinder of a diesel engine?
I am wondering how is diesel fuel injected into the cylinder of a diesel engine. Despite the difficulties of detonation, I think maybe a gradual injection of fuel during the power stroke will be ...
- 123
1
vote
0
answers
26
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Greek EASA part 66 basic license issue
Okay so I have been issued EASA part 66 B2 basic aircraft maintenance license by Hellenic Aviation that is Greece. Unfortunately it is not accepted by a lot many EU states. I am currently based out of ...
