## Top new questions this week:

### What is the meaning of these stencils, usually found on military planes?

I am wondering what these markings (which I found both in the French Super Etendard and in the British Tornado) indicate? They may be something relevant for the maintenance crews.

military aircraft-maintenance feature-identification aircraft-marking

### Why does the mixture knob spin?

On my first intro flight. I noticed the instructor twisting the mixture knob. I didn't think of asking, but now Im curious.

aircraft-systems mixture

### Can you identify this 1920s or 30s biplane?

Can you identify this aircraft from the 1920s or 30s I think? On the back of the photo it says “Taken at Nanking, after flying from Hong Kong to Shanghai”. I don’t know who the pilot is. My ...

aircraft-identification biplane

### Where is an example of "foreign airspace designated in the United States" mentioned in 91.129?

Reading 91.129 regarding Class D ops and establishing communications, (c)(1) mentions: "including foreign ATC in the case of foreign airspace designated in the United States" Can anyone ...

faa-regulations far-91 part-91-operations

### Do pilots need a fuel pressure/temperature gauge?

Fuel pressure gauge allows you to monitor the fuel pressure while the engine is under a load. However, since the fuel pressure requirement is listed by the engine manufacturer, do pilots even need a ...

aircraft-design fuel-systems

### Why would "hot gases" from a volcano damage helicopter rotors?

In the ongoing story about someone trying to rescue dogs from a volcano with a drone, I keep seeing variations of this claim repeated: Spanish authorities have dropped food down to the dogs with ...

helicopter weather volcanoes

### Why are coordinates written at parking bays in civil airports?

Why are coordinates marked at parking bays at civil airports?

airport-markings

## Greatest hits from previous weeks:

### What's the difference between a balked landing and a go-around?

Is there a difference between a balked landing and a go-around? If there is, what exactly is a balked landing?

landing terminology go-around

### What are the main differences piloting Boeing vs. Airbus aircraft?

What are the main differences in flying a Boeing vs an Airbus aircraft? Ignoring cosmetics, e.g. nose/window shape (see How can I tell apart an Airbus from a Boeing?)

airbus boeing

### Why are planes generally painted white?

When planes come off the assembly line at the factory, they're green: So why are most painted white? Surely a darker colour would hide dirt better? Is there a reason planes are traditionally white? ...

airliner paint livery

### How many passengers can an Airbus A380 carry?

What is the passenger capacity of an A380, and how many suitcases could it carry?

airbus-a380

### Why does the Boeing 787 engine nacelle exhaust have such an unusual shape?

Why does the Boeing 787 nacelle have this unique shape at the exhaust: I haven't seen it on any other airplanes, does it serve an aerodynamic purpose or help engine efficiency or is it just to look ...

jet-engine noise boeing-787 nacelle aeroacoustics

### What are the effects of the Boeing 787's very flexible wings?

I recently came across this picture of the Boeing 787 series aircraft's incredible wingflex: I suppose this is a consequence of using very light CFRP wings, but how does the wingflex itself improve ...

aerodynamics aircraft-performance boeing-787 wing-flex

### Can a human get sucked into a jet engine?

Can a human get sucked into the jet engine of a normal modern airliner? if so has it ever happened and what is the minimum or maximum weight that these engines can suck? As a safety measure, wouldn't ...

safety airliner ground-operations

## Can you answer these questions?

### What is the difference between "origin date" and "departure date"?

In different sources e.g. OAG's API:s (Application Programming Interface), there are both (scheduled) "departure date" and "origin/origination date". In general (so not ...

terminology time
 asked by stoft 1 vote

### Can I just differentiate my Euler rates to get the angular rates?

There is this matrix: {W_{\eta}}=\begin{bmatrix} -\sin(\theta) & 0 & 1 \\ \cos(\theta) \sin(\phi) & \cos(\phi) & 0 \\ \cos(\theta) \cos(\phi) & -\sin(\phi) & 0 \end{bmatrix}\$...

aerodynamics flight-dynamics