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0answers
6 views

Professional CFD softwear for aerodynamics?

What is best profi CFD softwear for aerodyanmics?
1
vote
0answers
19 views

How safe are commercial airliners from gallium infiltration?

I recently saw a video on gallium infiltration on YouTube. Gallium is a metal with a melting point somewhere between standard room temperature and human body temperature, meaning if you pick up a ...
0
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0answers
20 views

Are there any automated path planner algorithms for indoor drones?

I am developing a drone for sanitization, I am looking for a middle layer Software/Algorithms/Method which decides the flight path. The needs are as follows: Need to cover whole indoor area, for ...
0
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0answers
9 views

What are the expected vibration frequencies in a co-axial rotor system with contra-rotating propellers?

I am trying to understand the frequency spectrum of a co-axial rotor system. Form now i have a RC helicopter with two sets of three gear systems arranged in parallel, The number of teeth are 7,23,27) ...
12
votes
2answers
5k views

What are the bumps in the F-22 Raptor wing for?

As you can see in the picture there are several bulges or bumps in the wing that are located in the aileron and flaps. Somebody told me these are to hide the linear actuator, pushrod, and control horn....
11
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1answer
1k views

How does the fuel pump work in a PA-28 and when should I use it?

Just started flying again after 14 years and I'm taking this to the finish line this time. All my time, up till 10 am today, is in a C172. I did fly a PA 28-151 today and liked it. I do have some ...
0
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0answers
34 views

Stability Analysis of Aircraft

How can we do the complete lateral, longitudinal, and directional stability analysis of an aircraft by drawing appropriate geometry? I tried DATCOM+ but it has certain limitations. Is there any other ...
0
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1answer
94 views

What materials form the structural elements of the Boeing 737?

What materials form the structural elements (leaving the spars, ribs etc) of the B737? It was tough to get any information on the kind of composites used on the 737 structure. Hoping to get some ...
0
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0answers
46 views

What is physically happening when you use a bypass nozzle on a turbofan?

I am having trouble understanding how a fan affects the flow of air through the bypass in a turbofan engine. Solving for the flow of air using thermodyanic states requires using a bypass nozzle to &...
11
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5answers
1k views

How can I easily keep track of my landing count during pattern work?

PPL Student pilot, ~20 hrs Hi, whilst doing some pattern work I frequently find myself unable to keep accurate track of the number of landings. There's an AFIS at my home airport who keeps track (...
1
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1answer
70 views

Have I made a calculation mistake in this ATPL question that uses the CAP 698 Chart?

I have been calculating this question but I just don't seem to get the correct answer. For this question use Performance Manual CAP 698 SEP1 Figure 2.3. Using the climb performance chart, for the ...
0
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0answers
48 views

I'm looking for a flight school near Manhattan. What are the best options around within commuting distance? [closed]

I see a few airports on Long Island, in NJ, and in Westchester. Some seem to have flight schools. Can anyone recommend area flight schools or resources to research them other than Google? I'm a bit ...
4
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1answer
568 views

For the CFIs, CFIIs, MEIs, and AGIs - How often do you find students that utilize your ratings?

I am curious. Out of 100 new students that walk into the average flight school, how many only need a standard CFI, how many do instrument training, and how many do multi-engine training? Additionally, ...
0
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0answers
42 views

Airbus A321 CFM56 Engine - Engine Anti-Ice Valve

For Airbus A321 - CFM56 engine, is there any maintenance task or trouble shooting procedure that require to removal Engine Anti-Ice valve and its hose? (except remove engine and remove the valve ...
1
vote
0answers
59 views

What is the theory of the ram's horn yoke? [duplicate]

Embraer tend to use a Ram's Horn yoke in the Phenom and many of their RJ aircraft: And Cessna uses a more standard yoke with vertical sides: What is Embraer's reasoning for the Ram's Horn Yoke? Are ...
0
votes
1answer
81 views

Where can I find airport diagrams for the Philippines?

I would like to have airport map, just like the one that pilots can see when they are taxiing. Is it possible to get such a map, even if you are not a pilot? Perhaps there are applications which a ...
0
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0answers
41 views

Does thrust depends on rocket chamber shape? [migrated]

i mark with green part of rocket which produce forward thrust and with red backward thrust. integration of pressure around rocket walls gives total thrust,which allways act in forward direction.. Does ...
1
vote
1answer
88 views

How do rotor tangs lock into wheel keyways?

How do the rotor tangs lock into wheel keyways? Are there special keys on the outboard wheel half that allow locking the tangs in place? Also would be great if anyone could provide me with a image of ...
4
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1answer
680 views

Why do Dassault Falcons only have one thrust reverser?

Using all 3 engines would slow it down much faster. No?
13
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4answers
2k views

What is the best procedure for landing at my destination if I have a full electrical failure at night?

What is the best procedure for landing VFR at the intended destination airport and I have an electrical failure, in the following scenario? Let's assume this is a VFR flight and I'm 50 miles from the ...
0
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1answer
99 views

Is it possible to upgrade old Mirage-III and Mirage-V variants with thrust vectoring engines?

Is it possible to upgrade old Mirage-III and Mirage-V variants with thrust-vectoring engines so that they can match the maneuverability of F-16s?
0
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0answers
78 views

Why did South African Air force get rid of Atlas Cheetahs? [closed]

If Pakistan can fly Mirage-III and Mirage-V variants for 50 years, why did SAAF get rid of their Atlas Cheetahs? Ecuador is still flying Atlas Cheetahs.
8
votes
8answers
4k views

Plane that always flies into the wind?

Suppose that you dropped an uncontrolled, dummy glider into the air. You want it to always face into the wind by design. Would it be possible? If so, what would such a plane look like?
5
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0answers
37 views

Can climbing above RVSM airspace cause temporary loss of separation with an aircraft in RVSM airspace?

Consider Aircraft A cruising at FL400 and Aircraft B cruising at FL410. Both in close proximity, heading in the same direction. Ignore altitude for direction of flight issue. When aircraft B requests ...
-1
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2answers
194 views

How calculate water rocket thrust? [closed]

both nozzle is 2cm diameter one "rocket" has air pump which hold constant 5 bar second "rocket" it has water inside and also air pump which hold cosntant 5 bar,(water column is ...
0
votes
3answers
164 views

When flying on a glide slope, does the G meter show 1G or less?

If your angle of attack in landing pattern is 14 degrees but your vertical velocity is 600 feet/minute, does the HUD show you 1G or not? Why?
0
votes
1answer
121 views

What are the names of the antennas which I have marked in this picture of a Boeing 737?

I have taken the picture from PMDG 737NGX Microsoft flight simulator X. I am really curious to know what this antennas are. These antennas are behind the nose gear.
0
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2answers
64 views

Does DA/DH refers to ceiling?

If airport is reporting FEW001 or SCT001 and RVR is above 600m, does it means that there will be no LVO because ceiling is defined as more than 4/8 and DA/DH will be more than 100ft because DA/DH is ...
0
votes
2answers
72 views

What is the difference between ILS and VOR/DME?

I have wondered many times about the difference between VOR/DME and ILS and which one is better for carrying out approaches. Why do pilots use VOR/DME when the ILS is a better option because it is ...
2
votes
3answers
291 views

Is a jet engine's shaft neutral in the direction of thrust?

I think I read somewhere that the forces on a jet engine shaft is neutral because the forces at the turbine and compressor cancel out. This means that the axial bearings don't have force on it in ...
3
votes
1answer
129 views

Other than the 747, are there any other current, recent or planned airliners with a nose door option?

Boeing has recently announced that the 747 program is coming to an end. One of the key features of the freight 747s was the nose door, which facilitated faster loading of freight and allowed the ...
0
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1answer
110 views

What is relation between Reynolds number-turbulent flow-flow separation? [duplicate]

can some explain conection betwen re number -turbulent flow -and flow separation ,in example at wing in the air and water? 1)does high numbers= turbulent flow mean higher resistance to flow separation ...
2
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0answers
23 views

Why is hybrid laminar flow control preferred for swept wings over other options?

As I understand it, a (the?) major form of laminar-to-turbulent transition on the swept wings of large jets is the crossflow caused by the sweep. One way to control this is laminar flow control by ...
1
vote
1answer
167 views

Is/why isn't the Antonov 124 to 225 wing upgrade method common?

I'm told that wing redesigns (edit: for tapered, swept wings) are difficult, so variants of a model often do with a common wing optimized for the middle member. But then I read the following: Based ...
1
vote
1answer
44 views

Why does a steady-state non-zero body yaw and/ or roll rate induce side force?

An answer on ASE states The presence of steady-state non-zero body yaw and roll rate induces side force ($C_{y_p}$ and $C_{y_r}$). What is a non-mathematical explanation of why this is so? Is it ...
8
votes
1answer
1k views

What is this “Supersonic French” aircraft?

To celebrate Bastille Day, Ubisoft released the below (2D) in-game charm for their game, Tom Clancy's Rainbow Six Siege. Despite frantic searching on Wikipedia, I cannot for the life of me figure out ...
7
votes
1answer
396 views

Why does the UK CAA restart its page numbering with every new chapter of their CAP publications?

Every CAA Publication (CAP) seems to restart its page numbering when starting a new chapter. Does anyone know why they have decided to do this? For example, the CAP413. Instead of a logical page ...
1
vote
1answer
47 views

How does wing shape impact shock structure?

I am trying to understand what the 3D shock structure would be for a wing in supersonic flow. Suppose we have a wing which is made of double-wedge airfoil cross-sections. If we view the shock ...
3
votes
3answers
207 views

Is PVC tubing a good material for helicopter airframes?

Been thinking of getting into the hobby of building ultralight helicopters, and would PVC tubing be a good choice to build the overall airframe?
2
votes
1answer
98 views

CH-37 Mojave Helicopter decibels

What was the decibels level for the Sikorsky CH-37 Mojave Helicopter? 1956 --1959. I need this information for the VA, to process my hearing claim. I was a crew chief in the Army.
1
vote
1answer
240 views

Can Airbus A320 doors be opened mid-flight?

Today I learned how airliner doors are typically an outward facing plug and cabin pressure would make them nearly impossible to open mid-flight. It's easy enough to see that for the shape of Boeing ...
0
votes
1answer
94 views

Does the strength of a wingtip vortex generated by an airfoil peak at the critical angle of attack?

I know that generally, wingtip vortices increase in strength as the angle of attack increases. Is the critical angle of attack/Cl Max the peak strength, or do the vortices generally continue to ...
12
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6answers
5k views

Are there any remaining flying boat or seaplane airliners in operation?

Is there anywhere in the world that still offers scheduled air carrier service using flying boat / seaplane types of aircraft - something akin to a proper airliner? Or are they all limited to charters ...
2
votes
1answer
99 views

Is there a 'common courtesy' distance that should be complied with when initiating contact with ATC for class D airspace?

Some background: I'm a student pilot preparing for an upcoming stage check involving XC diversions and have been trying to visualize different scenarios of what I'd need to do when diverting. One case ...
11
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1answer
987 views

What is this thing on a FDX MD11 (MD10?)?

I assume something forward looking; not sure why there and how they got this to play nicely with radar
0
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2answers
282 views

Is it feasible to replace a C152's engine with multiple small turbine engines?

If I wanted to remove the piston engine from a cheap plane like a Cessna 152 and add small turbine engines with an equivalent thrust but weighing less, where would be the best place structurally to ...
1
vote
3answers
92 views

Why does a banked aircraft create sideslip?

Below is an excerpt from Raymer (Aircraft Design) where he explains the dihedral effect. He states that a banked aircraft (due to say a roll disturbance) will have a sideslip which leads to a ...
0
votes
1answer
89 views

RC airplane required engine power

I'm going through the process of designing an RC airplane. I know that probably most calculations on scale models might be non-precise ones, but I'm trying to do it as correct as possible (it's a ...
1
vote
1answer
46 views

Are AWOS data open for commercial use? [closed]

I 've found out this great website where you can get historical AWOS weather data. I would like to use it for a commercial application but I don't find any data license. Do you know if the AWOS data ...
4
votes
1answer
206 views

Can airplanes benefit from this “roughness” on bird wings?

Why do birds have so much rough surface (overlapping feathers) compared to aircraft? Isn’t that cause additional skin friction drag? Could planes maybe benefit from this? link: https://www....

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