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14 views

Feasibility and process for the approval of a modified glider

I am looking into a business idea that requires glider sized semi-automatic drones but I am very naive when it comes to the regulations and rigour of the aviation and airline industry, so I am hoping ...
0
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0answers
8 views

Boundary Layer Ingestion - Would it also work at supersonic speeds?

I have searched the forum and the internet but can't find the answer to my question. Would the 10% increase in fuel efficiency from BLI function at supersonic speeds? The 10% increase is the number I ...
3
votes
1answer
46 views

What’s the difference between an AIRSPEED LOW warning and a STALL warning?

Just an enthusiast here; pardon the dumb question. Im a little confused between the difference of a stall and airspeed low. “An aircraft Stall Warning System is that system which provides the pilot ...
3
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0answers
59 views

Do airliners get substantially different weather briefings from the rest of us?

Southwest Airlines flights were delayed and cancelled this week due to an outage in their third-party weather provider. I understand if they have a streamlined business process for getting weather ...
-1
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0answers
29 views

How create our own costume airfoil [duplicate]

I need creat airfoil which canIf the airplane is designed for low-speed flight, a thick airfoil is most efficient, whereas a thin airfoil is more efficient for high-speed flight. There are generally ...
-2
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0answers
29 views

Basis of certification, FAA vs EASA inspections

Is this an accurate description of inspection differences regarding type certification? For the basis of certification the FAA utilizes Organization Designation Organization (ODA) for Direct ...
1
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0answers
51 views

How are compressor disks connected to the shaft?

I am trying to learn how compressor disks and shaft are connected each other. I don't have any idea about the terminology so I couldn't find anything useful. Here is a section view of a sample and I ...
3
votes
1answer
312 views

Are there any ICAO restrictions on naming a taxiway?

According to ICAO are there any certain restrictions to naming a taxiway? For example: a certain letter cannot be used it cannot have letters that match a parking stand etc.
2
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0answers
95 views

What are those green LED arrays on top of the instrument panel called?

Below is the link showing a fire fighting aircraft From 0:23 to 0:45 an LED array can be seen. The peculiar thing about that is as aircraft approaches the site, all ...
0
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1answer
73 views

Can anyone tell me more info about this radial engine?

non-aviation expert here doing a project for a friend. I am trying to learn a little more info about this 3D model radial engine. I downloaded it off a stock 3D model website, that offered almost no ...
2
votes
1answer
65 views

Which types of aircraft need a gust lock? Is there a size / performance influence?

Which aircraft require gust locks on control surfaces? Is there a certain range in the middle in terms of size / performance where gust locks (external / internal) are required? From a cursory ...
1
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0answers
64 views

On a Gulfstream jet checklist, do you do the walkaround before or after disengaging the gust locks?

On a Gulfstream jet checklist, do you do the walkaround before or after disengaging the gust locks? With small planes we generally remove the gust locks as we do the walk around, but with a larger jet ...
9
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6answers
3k views

Were propeller airplanes significantly more “scary” to fly in compared to modern jet ones?

I've flown exactly once in my life. It was in 2004, with a commercial jet. Not a "jumbo", but a normal-sized jet plane in common use for cheap flights in that year. (Well, twice if you ...
2
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1answer
183 views

Is it feasible to repair a C152 that flipped onto its back?

So there's a C152 that was tied down and blew over onto its back, suffered some damage to its wings (but electric flaps still work) and significant damage to its stabilizers. Can it be fixed by ...
2
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0answers
109 views

When did FedEx acquire it's current callsign and airline ID's?

FedEx currently uses the callsign "FedEx" and has the IATA and ICAO ID's of FX and FDX respectively. Back in the 1990's they used the callsign "Express" and the IATA code was FM. (...
2
votes
1answer
74 views

How critical is trailing edge geometry/sharpness on wing performance?

This question occurred to me when I was meshing an airfoil for CFD analysis having a sharp trailing edge. The upper and lower side smoothly converge having tangency at the end. After hours of ...
8
votes
1answer
531 views

Why would holding instructions be sent as an ACARS message?

I was browsing ACARS messages listed on an aviation enthusiast website in Greece (similar to FR24 and others), and noticed a message sent to UA124, a 767 from KEWR to LGAV: The SAT VOR is located at (...
0
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3answers
167 views

Can a commercial pilot fly under this situation? about private carriage

scenario 1. I'm a commercial pilot/flight instructor and employee of the flight school, who carries the flight school’s CEO and other staff on business trips, do you know what part of the regulations ...
0
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0answers
67 views

What's the simplest plane ever built? [closed]

what is the simplest plane ever built? By that I mean simplicity of construction, a plane that was built by someone in their backyard without specialized equipment
4
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5answers
217 views

How do aircraft instruments determine the aircraft's orientation relative to the ground?

Autopilots exist for airplanes and drones, how is orientation measured with respect to ground? In particular how is the direction of gravity detected and how is it differentiated from acceleration due ...
2
votes
1answer
57 views

What are the stability criteria of helicopters?

In airplanes, longitudinal stability is maintained if centre of lift lies aft of center of gravity. Like in the airplane shown in the figure below, do helicopters also have stability criteria? They ...
-1
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0answers
44 views

What are the definitions of stages and sequences when describing a flight, and how do they compare against leg/portion/sector/segment? [closed]

I read: Question: In what case doesn't a coupon correspond to a segment? Comment: This is getting into the weeds of terminology that most travelers don't need to deal with; there are also sectors and ...
10
votes
4answers
4k views

What is this radial-engined US Navy aircraft in Iceland?

My parents are traveling in Iceland and sent me a few pictures of an old radial-engined aircraft. It has "United States Navy" markings on the side, "Keflavik 17131" on the tail, ...
-1
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2answers
37 views

When can an ASEL CFI with Commercial AMEL rating provide and log dual given?

Specifically Does not hold MEI. Has 0 hours in Cessna 310. Can he provide and log dual given in that Cessna 310? and, What if he is not AMEL only ASEL? Current regulation? 14 CFR 61.51(e)(3) https://...
-1
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0answers
103 views

Will the plane take off from the ground? [closed]

Good day, everyone. I need help here. I'm working on an ultralight aircraft. Here are the details: Propeller diameter: 1.2 m Engine: 15 HP / 3600 RPM gasoline engine Plane weight: 50 kg empty + ~9 ...
2
votes
1answer
183 views

What are these holes at the rear of 747s?

What are these two holes at the rear of most 747s? I've found plenty of answers for the holes on the front of the wing box, but no answers about these back holes.
2
votes
1answer
62 views

My medical cert is expired and can I fly as a sport pilot?

I'm CFI and one of my student haven't flown after he got his private pilot license in 1990's and he wanted to fly again. The thing is his medical is expired already and he doesn't fit medical ...
1
vote
3answers
59 views

Why is the maneuvering point (Va) in the V-n diagram defined as the upper intersection point? Why not the lower point one?

in my textbook and apparently everywhere online I have found that Va or cornering velocity is defined to be the point of intersection where the stall line and the limit load factor line meet. ...
3
votes
2answers
100 views

How does afterburning not affect upstream air in the engine?

I've read in many books that afterburners are designed not to affect the upstream engine components, so if there's a large amount of combustion going on after the addition of afterburner fuel, how ...
3
votes
3answers
320 views

Did the jet stream really stop the B-29, or was it just bad luck?

The B-29 bomber, used in WWII, was designed as a high altitude bomber, capable of operating from altitudes in excess of 30,000 feet. However, starting with their first missions to Tokyo in Nov 1944, ...
1
vote
1answer
90 views

Reducing popularity of 4 engine aircraft [duplicate]

We can see that now most latest airplanes by Boeing and Airbus like 737 max or A350 have twin engine configuration instead of 4 engine. And many airlines are discarding iconic 747s and A380s. What is ...
20
votes
12answers
6k views

Is there an example of a classic aviation engineering moment when engineers had to discard all their work due to the wrong approach?

Is there any classic aviation/space engineering moment where the engineers had been working on a concept for months and then realised that their approach to the problem wasn't quite right and so had ...
1
vote
1answer
99 views

How do Luneberg lenses hide a stealth aircraft's real signature?

I thought aircraft was supposed to be stealth and not show up on radar under the right conditions. This article says Removable Luneburg lens type radar reflectors are sometimes attached to military ...
1
vote
2answers
88 views

Conflicting A320 Climb Profiles

In the Airbus brochure (more like a book) Getting to Grips with Aircraft Performance, the standard climb profile for the A320 family is mentioned as 250 kt / 300 kt / M0.78 With this accompanying ...
2
votes
2answers
128 views

Can an ultralight be flown at night or IFR?

In Canada, can an ultralight be flown at night or IFR by a PPL pilot with a night flying or IFR endorsement if the ultralight is equipped for night flying or IFR ( eg. heated pitot tube, nav lights, ...
4
votes
0answers
53 views

Can a US citizen fly a US ultralight into Canada?

Can a US citizen (no pilot license) fly a US ultralight into Canada or any other country? Due to a special exemption, Canadian pilots can fly a basic ultralight (registered but no certificate of ...
2
votes
1answer
84 views

Are vortex generators considered high lift devices on US ultralights?

Are US ultralights allowed to have vortex generators? I understand US ultralights are required to have a landing speed of 28mph without the use of high lift devices. I understand this is so that the ...
1
vote
1answer
34 views

What are the minimum pilot certification and flight time to serve as SIC under Part 135?

What are the minimum pilot certification and flight hours to serve as SIC under Part 135 in a normal, fixed-wing operation?
0
votes
0answers
32 views

How is washout built into a fibreglass wing?

How is washout built into a fibreglass foam core wing of a GA Airplane with 40% span flaps, 40% span ailerons. Does the angle of indigence change gradually over the span of the wing, or is the airfoil ...
1
vote
0answers
36 views

Why do the landing gears of Boeing 767 and certain Airbus aircraft tilt down? [duplicate]

I need help and some explanation on why are they sometimes tilted down instead of up.
1
vote
4answers
166 views

Which way to turn to return to runway for downwind landing— into crosswind or with crosswind?

The scenario-- you are taking off with a significant headwind component but also a significant crosswind component. You experience a power loss (or perhaps a tow rope break in a glider). You judge ...
2
votes
1answer
119 views

Strange C560 flight over the Netherlands - circling and extreme variations in altitude. Possible reconaissance or military?

Last night around 24.00 I noticed a plane flying very low over my house. Intrigued, I tracked the flight on FlightRadar and went digging for records. It turned out to be Cessna 560 Citation Encore+, ...
7
votes
3answers
2k views

Which flight maneuver is better for a takeoff emergency after liftoff, a tear drop (180° turn) or a 360° turn?

Let us say I got a time critical emergency right after the liftoff (like a fire, complete power loss) and I need do a return-to-runway and re-land maneuver. Which option is better, a 180-degree turn ...
2
votes
2answers
1k views

Why would I want to lower the stall speed?

Why would a cargo pilot for example want to dump fuel to lower the stall speed? I understand that lowering the weight decreases the stall speed, meaning it is "easier" for the plane to reach ...
-4
votes
0answers
38 views

Can anyone help me with some CAD/2D/3D drawings of an WW2 airframe? [closed]

I am starting an aviation museum, a total nonprofit aviation education community in my country. For this project, I need a sponsor, a volunteer, 3D maker, a CAD designer to draw for me the DXF/DWG ...
5
votes
2answers
176 views

Could Sudden Decompression Cause You to be Shot Out of the Tunnel on a B-29?

One of the features of the WWII B-29 bomber was that it was pressurized. The aircraft had pressurized areas in the front and the back of the aircraft. Connecting the two was a pressurized tunnel over ...
1
vote
2answers
68 views

Standard Size to Print a sectional chart?

What sizes does the sectional charts are sold at? I downloaded it from here, and was able to print it on a large format printer. https://www.faa.gov/air_traffic/flight_info/aeronav/productcatalog/...
2
votes
1answer
131 views

What is the maximum range over open water with twin-engine to require dinghy in EASA?

What is the maximum range for a twin-engine aircraft to fly over open water before having the requirement for flotation devices (vests / dinghy) under EASA-rules?
2
votes
0answers
30 views

What documents do I need to take a German airplane outside of Schengen but still within the EU? [closed]

What kind of documents are required for customs or police if one flies out of Schengen (in this case a German-registered aircraft) and lands in a non-Schengen state within the EU?
2
votes
1answer
285 views

What is the difference between equilibrium and steady flight?

If I'm flying a regular Cessna 172 and its perfectly trimmed and flying in circles holding the same altitude, is the aircraft in equilibrium? Or steady flight? (The definition of equilibrium flight ...

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