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2
votes
3answers
124 views

Does aircraft/ATC get any information directly from a weather balloon?

We have been launching radiosonde (a meteorological instrument containing GPS and other sensors to measure meteorological variables attached to a balloon filled with Hydrogen) to obtain meteorological ...
1
vote
0answers
60 views

What kind of motors are used in electric autopilot servos?

In terms of general aviation/experimental autopilot servos for control surfaces, are these motors usually brushless DC or stepper motors? Some examples are: Garmin GSA 28 (brushless DC) Dynon ...
6
votes
3answers
237 views

What is the helicopter in the background of this image of the V-22 Osprey?

I found a photo of a V-22 Osprey alongside an unknown helicopter on the left corner:
5
votes
2answers
222 views

Do I understand the rules of logging cross-country time as a Safety Pilot correctly?

Let's say there is a private pilot ("primary pilot") practicing instrument training under the hood and a private pilot who is a Safety Pilot, and the flight involves a landing at an airport ...
3
votes
1answer
118 views

How does a bearingless rotor work on a helicopter?

I have read about some helicopters now using a mechanism referred to as a "bearingless rotor". From what I've seen online, the system involves a flapping hinge. What I struggle to get my ...
3
votes
1answer
121 views

Runway incursion episode/incident

Situation: I’m at the uncontrolled small airport (one runway and one taxi way). The runway in the direction I will be taking requires backtaxing. I’m ready to taxi, I check the radio and get ‘clear ...
3
votes
3answers
198 views

Am I expected to stay on glide slope for landing in a light aircraft?

When I land the airplane (Cessna 172, 182, 152) I notice that I come in pretty far above glide slope (four white lights on the PAPI). I pick an aiming spot on the runway (like the second center line ...
0
votes
1answer
90 views

Any idea what this Ampaire plane is?

(Source) This is certainly not the Ampaire 337 or Electric EEL, which is a converted Cessna 337. It looks like a boundary layer ingestor. Being from Ampaire, it probably is electric or hybrid. I've ...
7
votes
1answer
542 views

What is this metal piece sticking up on the roof of a 182?

My CFI and I were stumped as to what the purpose of this metal piece is on the roof of a 182. I couldn't find anything from searching Cessna POHs/docs online... Any ideas? Here is a close-up:
1
vote
2answers
129 views

Is there a legal requirement for planes to start from the ground?

If I could somehow store a plane inside another plane, would I be allowed to start the second plane somewhere in the air? Maybe different countries have different laws for this kind of aviation? I ...
2
votes
2answers
165 views

Is the Batjet Design Physically Feasible?

I realize the plane is fictional. However, in the Batman Animated Series by Warner Bros, we see this Batjet. So this got me thinking (and I'm not a physicist): is this air frame configuration even ...
0
votes
0answers
63 views

Is Chinese WS-13 jet engine in serial production?

The Guizhou WS-13 was being developed to power Chinese JF-17 and J-31 fighter jets. Is its development complete? Is it certified/finalized for serial production?
0
votes
1answer
196 views

Anyone recognize this airport?

I found this image on boldmethod. Where is this? Looks like a beautiful place. Has an instrument approach (from the runway markings.) On a mesa in snow country. It is not Sedona or St George. ...
19
votes
5answers
4k views

Are planes allowed to fly in circles, and is there a minimum legal altitude for takeoff and landing?

I live near a small, possibly private, airport. Every day there are small planes flying low over the neighborhood in circles for over half an hour. They appear to just be flying for recreational ...
2
votes
2answers
147 views

Has a civil aviation accident ever involved more than two manned aircraft?

Has a civil aviation accident ever involved more than two manned aircraft? Meaning, in one accident: more than two manned aircraft had fatalities or serious injuries or significant damage; or one or ...
1
vote
2answers
127 views

Was it ever considered to optimise a jet to normally operate with one engine shut off?

As I understand it, the current trend to reduce all commercial aircraft to no more than two turbofans has long-relevant reasons – the more engines, the higher the fuel consumption – and earlier jets ...
1
vote
0answers
36 views

How is NASA going to get high fuel economy on the X-57? [duplicate]

This X-plane is meant to fly soon. It's a modified Tecnam. The propeller direct wash over the wings, increasing lift. This allows the use of a smaller, high-aspect ratio, low drag wing. But this isn'...
2
votes
2answers
97 views

How is the term “Coast” defined for FAA regulatory purposes?

14 CFR 91.1 defines the applicability of part 91. This paragraph defines two areas of jurisdiction where certain parts of part 91 apply: within the United States, including the waters within 3 ...
3
votes
1answer
57 views

What's a normal response delay for a paragliding vario?

I'm a paragliding pilot with P4 licence and I've purchased a 2nd-hand FLYMASTER B1NAV flight instrument for XC flights – mainly for logging the flights (route, distance, max. speed etc). It is an ...
5
votes
1answer
154 views

What is the reason for the fence aft of the static ports on some airplanes and helicopters?

Airbus AS350 helicopters and Bell 206 helicopters have a 1/2" long fence behind the static port. CRJ 200/700 have a .060" step on the aft side of the static port. What would be the reason ...
1
vote
1answer
44 views

How do you calculate the wing moment coefficient knowing the moment at each spanwise station?

A lot of theoretical formulas exist for finding the moment coefficient for airfoils, but I have been confused by how to get the moments for a wing. I came up with three related questions that have ...
0
votes
0answers
24 views

Why don't most business class seats fold out fully? [migrated]

My issue is as follows: Why almost all business class seats do not recline to a full flat configuration? Is it a design challenge that is difficult to overcome? I understand that it may save space (...
1
vote
0answers
26 views

FIS-B lookahead for SUA Status

While reading over the recent FDC NOTAMs, I saw this interesting entry come up: ...
0
votes
1answer
218 views

What were those two military helicopters that I recorded?

I have recently recorded two military helicopters. Here is a screenshot of it:
2
votes
1answer
148 views

What altitude restrictions are there in Class C airspace?

So if I'm flying into a Class C airspace, I call approach and I establish radio contact and tell them I want to land, then I enter the airspace. If I'm still talking to approach and haven't been ...
2
votes
2answers
185 views

Are General Aviation tires filled with Nitrogen?

Long story short, I'm working on a concept for a book. We all know why commercial aircraft have nitrogen tires, but my question is if GA aircraft have nitrogen tires, or are they just filled with ...
-1
votes
1answer
229 views

What happens in an F-16 once the aircraft exeeds its service ceiling?

What exactly is the sequence of events that would unfold as an F-16 attempts to exceed its service ceiling? The scenario is simply full afterburner and attempting to simply climb higher and higher (at ...
1
vote
0answers
47 views

What is the difference between Guidance Law and Control Law?

What is the formal definition of the two in terms of flight control theory? My understanding is that a guidance law directs the high-level motion or direction of the aircraft and generally produces a &...
3
votes
1answer
122 views

Is there a common route that Seattle GA pilots use to circle Mt Rainier while avoiding class B airspace?

I'd like to fly around Mount Rainier in a C172 out of Renton (KRNT). What route do people usually take? I wonder if I can climb quickly enough once out of Seattle class B airspace for terrain around ...
0
votes
0answers
38 views

How to determine the number of copression stages given a compression ratio?

I have a personal project to design a gas turbine engine, the main problem that nags me is how do I determine the pressure rise in each stage of an axial compressor? Say, I'm planning on a 38:1 engine ...
8
votes
1answer
93 views

Does the yoke move when trimming a THS like it does when using elevator trim?

I would like a clarification from the operational point of view: Both the THS and elevator trim tab is used to remove pilot pressure on the yoke / stick. On the elevator trim similar to the C-172 the ...
0
votes
0answers
110 views

How can a designer deal with a strict requirement when designing an aircraft?

I'm working on designing an aircraft with some specific requirements (Vstall, Vmax, Ceiling, Payload, Range, RoC, Slanding/takeoff etc). I'm following Anderson's and Raymer's ways (trying to find the ...
0
votes
1answer
49 views

Does navigation database provided by the database providers like Aeronavdata or Jeppesen consists of company routes?

Does navigation database provided by the database providers like Aeronavdata or Jeppesen etc consists of company routes . How is the company routes maintained are those modifiable by the OEMs ? Is ...
2
votes
1answer
79 views

What is meant by these criteria for a stabilized approach? [closed]

Based on regulation, there are several criteria for when an approach is stabilized. I want to ask: Only small changes in heading/pitch. How small? The aircraft is in correct landing configuration. ...
-5
votes
1answer
141 views

Can an aircraft climb with the thrust line below the line of flight? [closed]

"Downthrust" is a common engine mount feature of propeller driven aircraft, models and full scale alike. From model building experience and flight, downthrust, angling the (tractor) engine ...
2
votes
2answers
193 views

Could you help me identify this plane (miniature model)?

please help me identify this model. Thank you
-1
votes
1answer
68 views

How do I calculate drift based on NDB readings?

An aircraft is to track from NDB A to NDB B. The RMI of NDB B reads 357 & RMI of NDB A reads 177. The aircraft is: A: Drifted left of track B: Drifted right of track C: On track I think it is 'C' ...
5
votes
1answer
265 views

What is the role of a CFI (not CFII) as safety pilot for hood time?

I am an instrument student at a flight school with a "primary" CFII whom I'm logging dual instruction time. Things are going pretty well, making progress but the instructor has been ...
3
votes
1answer
146 views

Are aircraft pilots required to fly runway heading for a certain distance?

If an aircraft rotates off the runway relatively quickly (runway mid-point for example), do pilot's need to continue on the runway heading for a minimum distance before turning based on departure ...
0
votes
0answers
22 views

The lift and moment of the tail equations

We have The lift of the tail, $$ L_t = C_L.q.S_t $$ The moment of the tail around c.g. $$ M_(cg,t) = C_M.q.S.c $$ look at the S in the two equations. Why the lift of the tail is proportional to the ...
11
votes
1answer
211 views

Can the acting PIC sit in the back?

For a planned ferry flight under FAA Part 91, this is the scenario: Two of us, let's call us A and B (rated pilots for that airplane), want to sit in front and do the flying. A highly experienced ...
1
vote
0answers
97 views

Can any US airline fly to and from any US city it wants to?

I am trying to understand the US commercial aviation industry. Assuming that slots are available, are US airlines permitted to fly to and from any US city they want to? Or are there limited permits ...
-2
votes
2answers
100 views

In the context of aircraft design, what are the differences between a flat plate shaped airfoil and a droplet shaped airfoil? [closed]

I am relatively new to aerodynamics and am curious to know what difference it makes on an aircraft - lift, drag, weight etc - which of the two airfoils is used on the wing.
0
votes
1answer
83 views

What is the angle of Incidence of wing of Airbus A320?

What is the Angle of Incidence/ Mounting Angle of the wing of AIRBUS A320?
2
votes
2answers
121 views

Do I need to change cruising altitudes for really short legs?

Let's say I'm cruising on a magnetic course of 150, so I'm flying at 7,500 feet. Then I need to fly for 6 miles on a magnetic course of 210, then back to 150. Do I need to switch to 8,500 or 6,500 ...
4
votes
2answers
104 views

Should I use rudder to recover from power-on stalls?

I was executing a power-on stall, and upon stalling the nose dropped and the plane rolled hard right. I promptly applied left rudder and released yoke backpressure to recover, and the plane recovered ...
1
vote
1answer
70 views

Where is flight following available?

What local facilities are required for me to get flight following services? It seems that if I'm 100 miles from any control tower then I won't be able to get flight following. How close does a ...
5
votes
3answers
229 views

Why do countries not bound by US law comply with the FAA's originate airworthiness directives?

I'm not an aviation or private international lawyer, but is it true that countries unbound by US law, i.e. most if not all countries outside the US, still comply with the FAA's directives? If so, is ...
0
votes
1answer
71 views

What is the meaning of GPS IAP RNP that appears in Notes?

Referring to the RNAV (GPS) RWY 30 approach, what is the meaning of RNP APCH in the notes section? (Highlighted in YELLOW) Also, what are the separate DA values in parenthesis? (Highlighted with a red ...
0
votes
0answers
75 views

Was the Jabara Dreamlifter incident the biggest difference between required and actual takeoff length?

DCA14IA016: on November 20, 2013, a Boeing B747-400LCF (Dreamlifter) landed at Jabara airport. They took off the next day which was considered a major feat given the discrepancy between the size of ...

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