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4
votes
1answer
86 views

Adverse pitch on unstable aircraft's roll

In airplanes like the F-22, both the main wings and the tailerons provide (at least at subsonic speed) positive lift. My question is this: when performing a roll using all control surfaces ...
5
votes
1answer
848 views

Are planes flying at night in Papua New Guinea?

I was watching the old TV show Destination Truth and the host Josh Gates said that no planes fly after dark in Papua New Guinea, is what he was saying fact?
7
votes
1answer
260 views

What are these white drops on the exhaust plug of a CFM56-7B engine?

Does anybody know what those white dried-up drops are? I checked out another Boeing 737-800 on the ramp and it also had the same defect so I'm guessing this is a common issue, or is it? This shows up ...
4
votes
3answers
193 views

Could catalytic combustion improve the efficiency of jet engines?

Catalytic converters have come into common use with the millions of automobiles on the road these days, greatly reducing their emissions of unburnt fuel and NOx. Because the converter is outside the ...
9
votes
2answers
3k views

What caused this crash landing?

Watching this video, my attention was triggered by the quite firm right rudder deflection, just before the right wing stalls. There's no information about what ...
6
votes
3answers
395 views

Holding entry is counted as a one turn holding?

If I ask ATC 'request direct to ABCDE waypoint and one turn holding', do they expect me to do the teardrop entry or parallel entry if I need to and fly the whole holding pattern after that? Or ...
4
votes
1answer
225 views

What CAD software is most commonly used for aircraft design?

What is most commonly used CAD software for aircraft design? AutoCAD, CATIA..?
4
votes
1answer
222 views

Why in the past were weather radars not used on fighter jets?

As far as I know, the weather radar is something that has been implemented very recently in fighters jets, from what I understand in modern radars it is possible to switch in various modes including ...
8
votes
8answers
2k views

Is there a deterministic guide to landing?

Much of the aviation related instructions seem clear-cut and science-based. For some reason landing seems heavy on art and light on science. To explain, I’m told to round out at about “yea” height, ...
7
votes
2answers
254 views

What is the difference between the series and parallel yaw-damper systems for the 707?

Some excerpts from the Pan Am 707 AOM indicate that the 707 can have one of two different yaw-damper systems, "series" and "parallel", with differing capabilities: YAW DAMPER The ...
1
vote
1answer
87 views

Does a green card holder need TSA approval to take the FAA knowledge test?

Do Green Card Holders need approval from TSA to start ground school and take the FAA knowledge test? Or are they allowed to take the test before they apply for fly training?
3
votes
1answer
94 views

Can a Student Pilot credit night takeoffs and landings towards meeting FAR 61.57 night passenger carrying requirements once becoming a PPL?

In the U.S., can a Student Pilot (Airplane-SEL) while training with an instructor and being the "sole manipulator of the flight controls," credit 3 takeoffs and landings to a full stop in ...
4
votes
1answer
235 views

What is the tapered cone on the B747 CF6 engine inlet cowling?

B747 and B767s are supposed to be using exact same GE CF6 engine, and as such their components are interchangeable including inlet cowl as they show to be effective in the IPC. However some of the 747 ...
5
votes
1answer
194 views

When was a multi-engine rating first required?

For the United States, does anyone know how this progressed over time / when? Was it always a rating? Was it an endorsement at some time? Called something else? Any history out there? Thanks
6
votes
1answer
346 views

In aircraft ventilation, what is meant by temperature increasing/decreasing for calculating the on-ground threshold?

In an open-circuit configuration, in normal operation, the A320 FCOM states: The open-circuit configuration operates when skin temperature is above the on-ground threshold. On-ground threshold = +12C ...
8
votes
1answer
175 views

Does SkyVector's flight plan give wrong magnetic variation corrections?

Lately I have noticed that Skyvector's Flight Planning tool "Nav Log" has been showing very wrong magnetic variation corrections for particular legs of my flight plans. The corrections ...
2
votes
1answer
238 views

How much heavier will a fuselage be with a 10% increase in diameter?

Is there some kind of a ratio or a very general rule of thumb that describes fuselage weight increase in relation to the increase of its diameter? (All other things being equal, length etc.) Note: I ...
7
votes
4answers
2k views

Is a VW Beetle engine a good choice for a light two-seat aircraft build? [duplicate]

What do you think of an air cooled Volkswagen engine for building a light two-seat airplane? This is probably the only engine I can get my hands on that needs no reduction gear and has enough HP. ...
1
vote
1answer
90 views

What is the difference between buffeting and wake galloping?

I am interested in flow-induced vibration and confused between buffeting and wake galloping. As far as I have studied, both phenomena are the vibration of an object with another object in front of it. ...
5
votes
3answers
604 views

Is it realistic that a plane reacts very quickly to rudder input as shown in a MSFS video?

Microsoft Flight Simulator is supposed to be a "simulator", so following the laws of physics. However, I'm looking at a gameplay video (at 2:17) and it shows a plane reacting really quickly ...
1
vote
2answers
155 views

Does closed oval wing produce two vortex and downwash between them, like normal wing? [duplicate]

Does closed oval wing like this in video produce two vortex and air between them goes in downward direction like on normal wing? I think yes ,because cause for downwash is wing that push air down, not ...
0
votes
0answers
37 views

How does the downwash change the effective AoA if it happens behind the wing? [duplicate]

In this video (biologists.com) I see two vortices and the air between them goes in the downward direction; that's supposed to be the downwash. But the downwash (induced vertical airflow velocity) ...
3
votes
2answers
1k views

What counts as "night" for a student pilot's night landings? [duplicate]

According to 14 CFR 61.57, "no person may act as PIC of an aircraft carrying passengers during the period beginning one hour after sunset and ending one hour before sunrise as published in the ...
0
votes
2answers
115 views

What does it mean when a hold short sign is out of service?

I prepared for "SELCAL" exam and in one of the routes I heard such information as RW 32 hold short sign at TWY L is out of service. I just don't understand this phrase. I appreciate it if ...
21
votes
3answers
7k views

Why is the 5G rollout a problem in the USA but apparently nowhere else?

The FAA is concerned that 5G cell phone signals could adversely affect radar altimeters on aircraft. This is because 5G signals are in the 3.7 to 3.98 GHz range, while radar altimeters operate in the ...
0
votes
1answer
101 views

Where can I find no fly zones such as active stadiums while doing flight planning?

I am a student pilot in training for a PPL. I read that it is illegal to fly over a stadium filled with people, but not illegal to fly over stadiums that are not filled. Obvious reasons, of course. ...
9
votes
2answers
3k views

What kind of gauge is this?

I acquired a small number of vintage (WWII era) aviation gauges. The others I have been able to successfully identify, but this one is a bit of an odd duck. It is marked Kollsman Type C-14, Part No. ...
14
votes
1answer
1k views

Does this Hawaiian Airlines descent look routine?

I was on flight HA 30 from Kahului to Seattle on Dec 19 2021 (Dec 20 Zulu time). FlightAware track log FlightRadar24 track log The descent looked anything but familiar. As you can see it reached over ...
13
votes
1answer
2k views

Why is there this open gap (?) above the root of this DC-10's horizontal stabilizer?

Aircraft with trimmable horizontal stabilizers need some way of sealing the area around the root of the stabilizer, so it can move up and down for pitch trim without opening up gaps in the fuselage ...
9
votes
3answers
3k views

How does the landing gear downlock mechanism work?

How does the landing gear downlock mechanism work? Especially when it's operated without hydraulic pressure or other energy sources. How can it keep the landing gear down and locked, during a gravity ...
18
votes
3answers
4k views

How efficient is a Scramjet?

I searched about the subject, but I couldn't find any place where the overall efficiency of the scramjet is compared to the other types of engines. All they say is how the "Scramjet is more ...
-3
votes
1answer
90 views

Is this concept of a hybrid between a Turbine Engine and a Reaction Engine (Rocket) practical? [duplicate]

So, I don't understand much about engineering in general, but since this is a discussion forum, I like to think that this is just a thought exercise (because it is probably useless). So, the idea ...
3
votes
5answers
2k views

Are there Hybrid Electric-Combustion Turbine Engines where only the compressor is electric driven?

So, from what I could understand about conventional Turbine Engines and its various types is that normally the combustion chamber ignites fuel with compressed air, rotating a low pressure fan which ...
0
votes
1answer
156 views

Can a fixed pitch propeller be designed to act as both a propeller and a generator?

The angle of attack (AoA) plays a major role in designing a propeller for specific uses, such as if it is to be designed for aircraft propulsion the AoA must be high, while the AoA must be low if it ...
3
votes
2answers
126 views

Does tailless delta configuration retain any advantage over conventional configuration with straight wings at high subsonic speeds?

For a model aircraft designed for cruise at say 0.75 Mach, do delta wings offer any benefit over straight wings. Is drag saving from elimination of the tail large enough to consider a delta ...
7
votes
2answers
915 views

What are the boxes around the airport on the IVAO Approach (APP) screen?

I play IVAO and I sometimes get curious about different positions that different controllers play on. Let's take this airport, Birmingham UK, this is what the APP (Approach) screen looks like What do ...
0
votes
0answers
111 views

Could DC-10s be equipped with seatback inflight entertainment screens, given that the oxygen systems are in seatbacks rather than overhead?

Unlike most passenger aircraft, the supplemental oxygen mask system on the McDonnell Douglas DC-10 was located in the backs of passenger seats, rather than in an overhead compartment in the passenger ...
1
vote
1answer
165 views

In a two-pilot aircraft (Capt/FO), are both pilots held responsible for a pilot deviation?

In the U.S. if, for example, an aircraft is instucted by ATC to climb and maintain FL280 but instead climbs to FL290, are both pilots, in an aircraft requiring two pilots (e.g. A320 or similar), held ...
1
vote
1answer
63 views

What is meant by the pointing vector and pointing vector magnitude in ECI?

In Siouris's Missile Guidance and Control Systems, it is stated that the angle of attack can be approximated in a 3DoF (degrees of freedom) simulation by the following equation: I know that ECI ...
4
votes
1answer
238 views

Is there a way to calculate the braking distance for a light aircraft?

PPL student, I train in a C152. Reviewing its POH I cannot find a method to estimate brake performance roll (as I would do with T/O roll). Is there any method or rule to calculate brake roll in ...
17
votes
3answers
2k views

What are satellite time, GPS time, and UTC time?

What is the difference between Satellite time, GPS time and UTC time? How are these calculated from one another?
8
votes
1answer
410 views

What is Automatic Radial Centering on a VOR indicator?

As the title says - some steam VOR indicators got an ARC indicator lamp. According to the POH of an aircraft featuring such a VOR indicator this means Automatic Radial Centering. What is that ? I ...
4
votes
1answer
118 views

What is the reason that the Russian flying wing UCAV does not have sharp leading edges?

The new Russian UCAV sports a fairly blunt leading edge while all the other UAVs in the same category have sharp leading edges.
2
votes
2answers
168 views

Battle Damage Checks / Procedures [closed]

Studying the damage model of DCS, especially on Warbirds, I encountered an operational doubt about the Battle Damage Checks. Here is the question: Suppose that after a sortie you are RTB, and you don'...
3
votes
2answers
268 views

What’s the difference between Arrival and Approach controllers?

Some airports have two separated frequencies related to arrival. Arrival and approach. When I navigate to some airports that have both frequencies, I first contact the arrival controller then, at a ...
1
vote
1answer
83 views

Is it possible for the lift force unit vector to be equal to the weight force unit vector?

I know that the drag force is parallel to the direction of flow, thus equal to the unit vector of velocity. But if you consider a vehicle, when its angle of attack is below the velocity vector from a ...
5
votes
4answers
173 views

How to monitor MSA sector from an RNAV waypoint in the 737?

For instance, at Manchester (EGCC) the approach procedure for RNP 23L has the MSA based off of RNAV waypoints; DOMIG bearing 142 to 322, OSNAP bearing 322 to 052, TINVA bearing 052 to 142. From NATS ...
6
votes
1answer
671 views

What does CPLD mean in aviation in general and on this altitude alerter?

I saw the shortcut CPLD on this altitude alerter from a Cessna 210, and could not work out what it could possibly mean: What does it mean on this altitude alerter, ...
0
votes
1answer
95 views

Would this concept of Autogyro/Gyroplane be efficient or practical?

First, i'm quite ignorant on aerospace engineering, so I hope I don't make too many incorrect assumptions. If you don't know what an Autogyro/Gyroplane is, here is the Wikipedia article of it. The ...
13
votes
2answers
2k views

What is the purpose of the leaf spring in an altimeter?

What is the use of the leaf spring present around the partially evacuated aneroid capsule of sensitive altimeter.

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