Federico
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  • Member for 7 years, 10 months
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How should I interpret the difference in flight direction (azimuth) for great circle and rhumb line?
Accepted answer
7 votes

I have no idea where the image comes from, but it seems that you have spotted an inconsistency/copy-paste typo. Let's remember that the heading is always measured w.r.t. the north, increases in a ...

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What is the "yaw damper"?
7 votes

What is the yaw damper? The yaw damper is a Stability Augmentation System from Aircraft Control and Simulation How does it work? It is an automated system that uses the yaw rate of the aircraft (...

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Why don't horizontal stabilizers have winglets?
7 votes

So why aren't there any sort of "minified" winglets available as an aftermarket installation? Actually the DA42 has them and in the MPP version they are even more pronounced

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Is the Soloy Dual Pac recognised as two engines or one engine?
7 votes

According to the certificate is a Twin Power Section Turboprop and, later, note 7: (emphasis mine) This engine is certificated as a unit comprising two separate power sections with the ...

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How can I use a window for an emergency exit?
6 votes

I personally would doubt the veracity of the quoted report, since they say I have no recollection after I got out of the plane I would wager that their recollection of the moments just prior could ...

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What is the diameter of a Trent 900 engine?
6 votes

The Trent 900 fan diameter is 295cm.

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How does the flap configuration affect the tailstrike limit on the A320 aircraft family?
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6 votes

A higher configuration number indicates that the flaps/slats are extended by an higher amount. In turns this means that for the same angle of attack the wings will produce higher lift (and drag) in ...

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How do diffusers turn velocity into pressure?
6 votes

While we wait for a probably better answer, here's my tentative. You state that you understand the concept of constant mass flow. Let's for a moment write the mass flow properly: $$\dot{m} = \rho A ...

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How does the slotted flap work?
6 votes

The answer lays into the pressure gradient. The air that flows along the top surface comes from an area of (extreme) low pressure and has to travel down the wing, a direction where the gradient is "...

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Are elevator trim tabs required for an aircraft equipped with movable horizontal stabilizer?
Accepted answer
6 votes

Is the aircraft also equipped with trim tabs? From the images available online (this is a youtube screenshot, click it to see the larger version), no. And see point 3 on why I was not expecting ...

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Can a passenger plane stand still in the air, or hover at a fixed location above a ground?
6 votes

can a commercial passenger aircraft stay at single location without any movement with respect to ground? In theory it could, with strong enough headwinds, low weight (no passengers nor cargo or ...

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How is "wing thickness" defined?
6 votes

From the image in the answer you link to: thickness in percent of chord and the chord (length) is the distance between leading edge and trailing edge of the airfoil of the wing.

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Why does the yoke "stick" in a turning position?
6 votes

It is a byproduct of aerodynamics. A constant aileron deflection gives a constant roll moment. A constant, non null, roll moment gives an increasing roll rate. During a turn you want a constant bank ...

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What is your favorite aviation joke?
6 votes

(Source is Punditkitchen.com, but the page seems not to exist anymore)

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Can a convergent nozzle be used for a supersonic jet engine?
6 votes

Can a supersonic fighter incorporate a convergent nozzle? It actually exists. The Panavia Tornado has a maximum airspeed of Mach 2.2 at 9000m altitude and has variable geometry convergent nozzles (...

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Can commercial airplanes be converted to drones?
6 votes

Is it possible to convert a Commercial Airplane into a Drone? Techical feasibility is just one aspect. Let's start from what is a Drone nowadays: it is a remotely controlled aircraft. This means ...

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Why are Inline Engines more commonly used than Radial Engines?
6 votes

Radial engines are better from the durability/mechanics point of view: having radially distributed pistons distributes the loads better and the shaft will be stressed equally from all directions. For ...

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What constrains a paraglider vertically?
5 votes

To be similar to the constraint produced by a rail, this vertical constraint should be in the order of thousands of kg, IMHO. Any suggestions on how to estimate this amount, and its origins? The ...

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What is this pusher airplane?
Accepted answer
5 votes

It is the only Bede XBD-2, from the early '60s. According to Wikipedia it was an experimental aircraft with STOL capabilities.

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If the Quadcopter is a MIMO Nonlinear System, How Can it be Controlled using PID?
Accepted answer
5 votes

If the Quadcopter is a MIMO Nonlinear System, How Can it be Controlled using PID? Exactly as you mention later: Does the model need to be linearized so that PID algorithms can be used? Yes, that'...

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Would it be possible to economically repair 9V-SWB?
5 votes

As far as I know, the damage has been categorized as "substantial", meaning that it will be costly, but the aircraft has not been written off. I would expect that the wing will be completely replaced ...

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What is the name and purpose of this part on the flap at the DA40?
5 votes

It is an actuator fairing. It covers the flap actuator so to minimize the drag created by it. An actuator directly exposed to the airflow would create more drag, increasing fuel consumption and ...

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What are the names of the forces acting upon the side of a vessel?
5 votes

As we engineers are extremely boring people, and given the fact that a name seems not to be available, we generally refer to them simply as "side forces". Or, at least, I never encountered a ...

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What are hydraulically powered and electrically controlled actuators?
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5 votes

As wikipedia mentions, "Electro-Hydrostatic actuators" (EHA) are self contained, the only input they need is electrical power and commands. The electricity powers up the hydraulic pump that is used ...

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What are the limitations of using a single shaft between the compressor and turbine in a jet engine?
Accepted answer
5 votes

How is this managed when there are several shafts connecting several compressors/turbines? The different shaft will rotate at different speed from each other, but the relative compressor/turbine ...

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Where can find Service Ceiling of an aircraft?
5 votes

It is in the pilot handbook, before the title page [PDF], under "performance-specifications"

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How close are we to replacing pilots with computers?
5 votes

As a person that "tries to replace pilots with computers" I personally say: not even close. The processing power (certified for flight, not the latest pentium sitting under your desk) is too behind, ...

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What are autothrust and manual thrust on an A320 (or other aircraft)?
5 votes

To add one piece of information to Jan's answer, quoting from the A320 Flight Crew Training Manual, a detailed description of what exactly is autothrust: OBJECTIVE The A/THR computer (within ...

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What configuration of autothrottle is required when pilots are landing an Airbus?
5 votes

Do Airbus pilots normally disengage the Auto Throttle on a manual landing ? Depends on what you mean. During the initial part of the approach, no, they do not deactivate the autothrust (not ...

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Why is dual crossfeeding prohibited on DA42?
5 votes

I checked both POH and Maintenance manual: neither explain why. POH: CAUTION Do not operate with both fuel selector valves in CROSSFEED position. Do not take-off with a fuel selector valve in ...

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