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1answer
50 views

Why is one exhaust directed upwards? [duplicate]

This is the first Cessna Skycourier during certification. Why are the two exhausts oriented upwards?
1
vote
1answer
45 views

Is there any publicly available research that projects pilots' loss of proficiency due to lack of flying (or guidelines to prevent it)?

The FAA requires 3 landings every 90 days to stay 'current', but as we all know, currency and proficiency are different things. I'm looking for data than can describe how proficiency loss correlates ...
0
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2answers
56 views

Can we show through simple geometry rather than formulae or graphs that the best glide ratio occurs at the maximum ratio of Lift to Drag?

For an unpowered glider, can we show through simple geometry involving force vector diagrams, rather than mathematical formulae or graphs, that the best still-air glide ratio is achieved at the angle-...
0
votes
1answer
31 views

What is the difference between a navigation database and an airport mapping database?

What is the difference between "navigation database" and "airport mapping database"? Are those both required by flight management software for flight planning?
0
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1answer
103 views

Roller Coaster Airline

Could an airliner legally (using a common regional jets or less likely airliners) and safely perform acrobatic maneuvers that would otherwise not be permitted for commercial passenger flights. Why? ...
7
votes
1answer
1k views

What is the procedure for an engine fire in the 737-800?

If there is a fire in one of the engines of the 737-800, what is the procedure to be followed in the following situations? Climb Cruising altitude Approach What should the pilot do in the cabin in ...
-1
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0answers
73 views
-2
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1answer
82 views

Why do airplanes circle three times in a holding pattern? [closed]

Why do airplanes circle three times in a holding pattern? I tried to look for information about it, but I did not figure out why a pilot would specifically do it three times?
3
votes
1answer
106 views

What is the highest number of airliners shown flying together in a single photo?

I was re-visiting this question about a timelapse photo of multiple airliners and started wondering about the maximum number of jetliners that could be photographed together while flying. I have ...
1
vote
2answers
64 views

What makes wing strakes desirable?

Some planes have this large protruding part at the wing root. If my understanding is correct, it's a wing strake and it improves lift at high aoa via vortex induced lift on the rest of the wing. I ...
0
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1answer
78 views

How is the B737NG Autopilot controlling pitch?

In particular, does the Autopilot in a B737NG control the pitch only via trim adjustment, or first via the elevators and then trim?
0
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1answer
104 views

Why aren't thermal analysis of propeller done?

I have searched for articles on Thermal Analysis of Propeller but couldn't find one. Can I assume the aircraft company don't perform heat transfer simulation and analysis of high speed propeller? Isn'...
1
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2answers
74 views

How can I estimate wind speed and direction in VFR?

I am new here, I started to do VFR navigation (no G1000) so I try to deal with the wind. I notice that I have some problems to find the wind speed and direction during flight. I am going to try to ...
12
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2answers
2k views

Why are longer wings with foldable wingtips used on the B777X instead of lighter ones with original size?

The new Boeing 777X has longer wings to improve efficiency, but has to adopt foldable wingtips to "fit" into all original airports that host its predecessor. Tendentially, longer wings would ...
0
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0answers
24 views

how tu update Gpsmap 196 on win10 with serial-usb adapter [closed]

I’m looking for a way tu update my gpsmap 196 with new nav data (adding a region), anyone of you managed to do it on a windows 10 with a serial-USB adapter?
10
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1answer
1k views

What kind of aircraft are currently being used by Boulder County to fight wildfires?

I was wondering, what kind of aircraft are currently being used by Boulder County to fight wildfires? For example, see photo attached of a plane dropping flame retardant on a wildfire over Left-Hand ...
5
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3answers
1k views

Why are pitot-static measurements preferred over other velocimetry techniques?

I believe hot wire anemometers (HWA, frequently used in wind tunnels to measure flow velocity) or other sensitive techniques could be used to determine the airspeed. Are there specific reasons for why ...
3
votes
1answer
1k views

Is it possible to get permission to fly in the DCA “no drone” area?

The entire immediate Washington D.C. area is in a “no drone zone”, in a 15 mile radius from DCA. Are there ways to get an exemption for activities such as film making, property inspections, etc?
6
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2answers
189 views

Are warnings generally “source-focused” or “effect-focused”?

I have trouble wording this question, please bear with me. Sullenberger recently stated that the pilots of the fatal MAX flights where likely under sensory overload caused by "multiple, ...
4
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2answers
102 views

Why does GBAS broadcast Final Approach Segment data when SBAS does not?

Ground Based Augmentation Systems broadcast message four, the Final Approach Segment, along with corrections for GNS signals in messages one and two. Since the FAS is essentially a semi-static ...
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0answers
27 views

Designing a lightweight remote controlled glider: optimal wing configuration and geometry [closed]

So here’s a summary: we need to design a remote controlled glider that will drop a load (golf ball) on a target. The load’s drop needs to be slowed down (ex: parachute). The glider must be very light (...
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0answers
55 views

During VMC conditions in terminal airspace (class B), does the pilots have to strictly follow separation standards issued by ATC?

Is it common for pilots to breach separation standards in terminal airspace while the conditions are VMC? I'm interested primarily in commercial aircraft that have scheduled operations in major ...
1
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0answers
130 views

During the WW1 era did engineers have a deep enough understanding of aerodynamics to build a primitive, guided gravity bomb? [closed]

When the war broke out in 1914 scientists already knew how to remotely control a vehicle with radio signals. In 1905 Spanish Engineer Leonardo Torres-Quevedo demonstrated a radio controlled boat that ...
3
votes
3answers
787 views

Does the FlightRadar24 pose a risk to aviation security? [closed]

As you may know, on the internet there is the FlightRadar24 website where you can see the flight information of planes worldwide in real time. Although this is wonderful for those who like aviation, ...
0
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0answers
15 views

Book on early rigid airship design and construction…? [closed]

Is there any good book on early rigid airship (Zeppelin and Schütte-Lanz) design and construction methods...? In English or German...
0
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0answers
26 views

How does a helicopter swash plate move? [duplicate]

I've looked everywhere but I can't find a good diagram of the inside mechanics of helicopter. I know what swashplate does but I want to how it is moved by the stick. Can someone pls give me a good ...
4
votes
3answers
254 views

Can Airbus A400M take-off from the beach fully loaded?

I've recently saw this footage. Airbus A400M tactical capabilities on natural surfaces by performing take-off, landing and taxiing manoeuvres. I wonder if she could take-off fully loaded from that ...
0
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0answers
49 views

What is the difference between Line-Replaceable Unit (LRU) and Line Replaceable Modules (LRM)? [duplicate]

i am studying Line-Replaceable Unit (LRU) and Line Replaceable Modules (LRM) but do not know the difference.
0
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0answers
50 views

Why does the Center of Pressure move forward on high-wing airplanes and aft on low-wing airplanes?

I've been trying to figure this out using variety of manuals but still not found a satisfactory answer. Can somebody explain in detail?
0
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0answers
104 views

Why is it still mandatory to land a plane without autopilot? [duplicate]

I know that there are runways in the world that operate CAT III where the pilot can land with autopilot. But why do most airports with ILS not allow automatic landing?
16
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2answers
3k views

What is this turbine engine panel that opens on landing?

Tonight I flew from Munich to Dortmund on an A319 and I happened to sit just above the wings and turbine on the right side. Upon landing, the turbine opened a window or panel which exposed some grid ...
0
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0answers
62 views

What is the exact data contained in an ADSB packet? [closed]

What is an exhaustive list of data contained in an ADSB packet?
4
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1answer
126 views

Is Flight Idle a constant?

Is "Flight Idle" for a jet engine a constant N1% value or does it vary with Altitude, and OAT?
4
votes
3answers
2k views

Would the solid material inside an airship displace air and be counted towards lift?

The hydrogen inside an airship has a mass that is approximately 14 times lower than the mass of air and this difference results in lift. However the solid material inside an airship including the ...
0
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1answer
102 views

What is rotor damping and how does it affect helicopter stability?

What do we mean by rotor damping (in terms of helicopters)? How is it affected by air density? How does helicopter stability depend on rotor damping?
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0answers
49 views

How to know which NVIS Class is used in an aircraft?

I wonder if NVIS (Night Vision Imaging System) class for a fighter jet is fixed or not? Is it possible that the pilot can wear any NVG (Night Vision Goggle)? If I want to find out the NVIS Class that ...
0
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1answer
60 views

Should “Thrust Reduction” and “Acceleration” heights be the same for the Boeing 737 NG?

Should the Thrust Reduction height be the same, lower or higher than the Acceleration Height? In other words, what is their "correct" sequence. I am referring specifically to the B737NG, if ...
0
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0answers
44 views

Would you say the Future of Aviation favors the engineers or pilots? [closed]

Once aircraft are able to be fully automated to perform routines including the evergrowing fleet of manless drones will there be any use for the future pilot and if so won't the competition be very ...
6
votes
3answers
2k views

Would atmosphere floating inside an airship be counted towards the mass of the airship?

Airships are filled with hydrogen. However as pointed out by Peter Kampf in the answer to the question below when an airship is on the ground only a portion of its hydrogen cells are filled with ...
5
votes
2answers
997 views

What is this aircraft parked in Oceanside Municipal Airport?

I was on my way to the beach at Oceanside on October 2020. On 4:32, I saw multiple Cessna or Beechcraft aircraft, as well as a Velocity V-Twin, on the runway of the Oceanside Municipal Airport. When I ...
0
votes
1answer
91 views

Are there any characteristics of a hypoxic flight? [closed]

Any patterns that investigators look for? For example, what happens when the engine flames out? is it guaranteed to enter a high speed dive? And would this affect certain parts of the aircraft, ...
-5
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0answers
95 views

Is technology stagnant? [closed]

Army has same equipment as 1980s. Just upgraded. Navy ditched zumwalt, the ford and Nimitz are same size and it's also using upgraded 80s technology. Air force has had progress. However the F 22s job ...
0
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1answer
84 views

What is the angle $\epsilon_{cl}$ in this diagram?

Here is an image showing the geometric significance of $\epsilon_{cl}$. To me it looks like the angle between the tangent of the underside of the trailing edge and horizontal (V infinity). Here is a ...
3
votes
4answers
153 views

How can L/D Max be both Best Glide speed and Max Range speed?

According to ANA best glide speed AND max range speed for propeller aircraft both occur at L/D max. This is a little confusing because in an A36 Bonanza Vbg is 110 KIAS and Vmax range has been ...
0
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7answers
437 views

How can speed and power be made independent in an airplane? [closed]

I heard a piece of information many years ago, and the more I think about it, the less it makes sense. It was like: When airplanes what to raise altitude, they do not increase speed, but they ...
2
votes
2answers
238 views

Materials usually used in dorsals fins specifically in the ATR 72

I am an aerospace engineering student and I am having problems finding information about the materials usually used in the dorsal fin of an aircraft. I would also like to know the kind of stress and ...
15
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2answers
4k views

Are test pilots certified to fly all aircraft types?

I just saw an hour long MIT lecture for no reason and the lecturer said he has flown over 70 kinds of aircraft. Does that mean a test pilot is certified to fly almost anything?
0
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1answer
55 views

How do anhedral and dihedral affect the efficiency of a wing?

Higher pressure air on the underside of a wing generally rolls outboard around the wingtip and over the top of the wing reducing lift and therefore increasing induced drag. My intuition would tell me ...
4
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0answers
58 views

Is there a standard for required repainting of worn runway markings? In USA

Is there an FAA regulation or advisory circular covering the allowable wear, fading, or weathering of runway markings? I can find many FAA standards for the paint of fresh new runway markings, but I ...
1
vote
1answer
92 views

What was the lift-to-drag ratio for WWI biplanes?

I will be interested to know what was the lift-to-drag ration for a few more known WWI biplanes at take-off, cruise and landing speed; with the propeller running, stopped or non existent (tests in ...

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