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1answer
48 views

Are cirrus clouds stratiform?

Cirrus clouds: Are they warmer than the environment? - Cumuliform. Or are they cooler? - Stratiform What differences do cirrus clouds have to the "Cirro" versions of a cumulus or stratus?
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0answers
35 views

What, as far as the FAA is concerned, is required for Ag Application? [duplicate]

There are lots of "you need this..." comments, but I'm wondering what is required, legally, by the FAA? A Commercial Rating, of course. Flying for money and all. A Taildragger Endorsement because the ...
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1answer
72 views

How to calculate minimum flying speed in distributed propulsion?

How to calculate minimum takeoff speed due to distributed propulsion? Is there a quick way or rule of thumb way to calculate effects of distributed propulsion? I understand NASA is doing research in ...
1
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1answer
97 views

How much do a DC-9's wings weigh?

How much do the wings weigh? How much does the landing gear weigh? How much fuel does it take to fill the tanks? We, at Confederation College are trying to donate a DC-9 for training purposes and ...
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0answers
68 views

Which non-US airlines allow their pilots to be based in a US outport?

My husband is about to receive a United States green card. He holds an EASA ATPL with Class A medical certificate and an FAA PPL. He is instrument trained for Airbus 330 type rating. We are ...
4
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1answer
76 views

What triggers the trim horn and the “stabilizer motion” aural callout on the MD80?

I got conflicting or incomplete responses from various sources: There is an internal rate monitor looking to see the stabilizer is actually moving .08°/sec or -08°/sec. https://forums.tfdidesign....
7
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4answers
5k views

Does a 4 bladed prop have almost twice the thrust of a 2 bladed prop?

Does a 4 bladed prop have almost twice the thrust of a 2 bladed prop? As a general rule, I'm told GA planes generate 4 lbs of thrust per horsepower. (Source: Zenith School of Airplane Design, Flying ...
1
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1answer
39 views

Is the arrival segment of an IAP in PANS-OPS the equivalent of FAA's feeder route?

In ICAO's manual 8168 ("Aircraft Operations"), the term "Feeder route" is never mentioned. Instead, it states: 8168 Volume II, "Approach Procedures": 1.2.3. Segments of the approach procedure. An ...
3
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2answers
226 views

How much does it cost extra to fly with one additional passenger?

How much does it cost to fly an airplane (like a Boeing or Airbus) when there's one extra passenger there, at an average speed of 475–500 knots (880–926 km/h; 547–575 mph)? That is, about 100kg extra,...
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1answer
64 views

What material and shape should be used for angle of attack sensors?

Does the material and shape of the vane for an angle of attack sensor have to be identical to the material and shape of the wing? What properties should I consider?
5
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4answers
255 views

What accidents have had crew accustomization to warnings among their causes?

A non-answer on this question claimed that: the idea that maneuvering with the stall warning activated will somehow damage us, causing us to ignore its warning when the chips are down and AOA is up,...
34
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3answers
13k views

Why do private jets such as Gulfstream fly higher than other civilian jets?

I heard in a TV show that private jets such as Gulfstream can fly at about 50,000 ft, higher than other civil jets. Is it an aerodynamic reason (lighter aircraft to be sustained in a less dense air) ...
3
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0answers
60 views

What type of jack is the flight interphone on transport category aircraft?

Recently became an A&P and part of my job is to be on the ground communicating to the pilots during push backs. Started shopping for a headset and have seen various ones with different adapters ...
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3answers
137 views

Efficiency of Flyboard engine

From what I understand (not much), you need good specific impulse to travel long distances with, say, flyboard. I know that RP1 has good specific impulse. I wonder if he used it, and what type of ...
1
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1answer
187 views

Did B-17 gunners beat on the wings of other planes in their formation?

I am certain my father, a B-17 pilot, told stories about his gunner having to beat on the wing of another plane in the formation with the tip of his gun to get the pilot to pull away and avoid a mid-...
5
votes
1answer
119 views

Has an earthquake ever complicated or prevented a safe landing/takeoff?

This question on being able to see ground effects of earthquakes from the air got me wondering: No doubt a severe earthquake at the wrong time could hinder even experienced pilots, but I expect a ...
4
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1answer
101 views

Is this a type of navigation aid?

I saw this contraption on the southeast corner of Eastern West Virginia Regional Airport, Martinsburg, WV (MRB). My first thought was this was some kind of NDB antenna but not sure.
2
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2answers
141 views

What and where are “flotation seat cushions”?

Inspired by the question Why did the US Airways Flight 1549 passengers stay on the wings? I read parts of the respective accident report[PDF]. They mention the flight was a non-EOW (extended overwater)...
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1answer
68 views

Is there any way I can check the status of my medical?

I was deferred my third class medical because of a certain condition and the doctor said I’ll hear from the FAA in about 3-4 weeks with either my certificate or they’ll ask for more information. It’...
18
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2answers
7k views

Why did the US Airways Flight 1549 passengers stay on the wings?

Couldn't they use the overwing slides as flotation devices and stay on those instead?
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2answers
131 views

What is the real difference between aerospace and aeronautical?

I see people using these two words interchangeably. But I feel there is a huge difference between the both.
3
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3answers
239 views

Why do some helicopters have such complicated flight control mixers?

Image source Some helicopters have a very complicated set-up that mixes flight control inputs to many or all of the swashplate actuators, like in the picture above for the S-76. Why are all the ...
3
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2answers
976 views

On an ADS-B In display, do the pilots see the squawk code or call sign for other aircraft?

If I understand correctly, with a ADS-B In equipment or TCAS equipment on board, the pilots could see the surrounding traffic with its assigned squawk code like "4653", is that right? But could the ...
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3answers
154 views

C172 models and panels design

How many C172 models there are out there and what are the differences between them? Which models have these "modern" (newer) instruments panel design like this one: versus:
2
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1answer
279 views

Why would a Blue Angels pilot leave their gear down?

In a recent Blue Angels airshow, one of the pilots had their landing gear down during the first 5 minutes of the show. What possible reasons would justify leaving the aircraft in this state? No ...
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0answers
22 views

Why at increasing BPR the efflux area should be enlarged (at high BPR)?

I am working on a university project. I have to comment on this chart (that represents efflux area variation with the variation of the BPR). Every other engine data are kept unchanged (turbine entry ...
2
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0answers
313 views

How do Alaskan bush pilots land and take off in 10'? [closed]

How do Alaskan bush pilots land and take off in 10'? Just looked at a video of the Valdeez STOL competition with pilot's taking off and landing in 10' How do they do it? And no, they don't have a ...
3
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1answer
206 views

Are there modern airplanes with two propellers driven by one single engine?

Except 1903 Wright flyer, are there any other airplane using one single engine driving two coplanar propellers? Coplanar means push-pull and coaxial designs are not in the question's frame. Tilt ...
31
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4answers
10k views

What is it exactly about flying a Flyboard across the English channel that made Zapata's thighs burn?

CNN's French inventor makes 'beautiful' flight across Channel on hoverboard reports that: "French inventor Franky Zapata has successfully crossed the Channel on a jet-powered hoverboard for the ...
2
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1answer
118 views

How to design a near vertical take off airplane?

How to design a near vertical take off airplane, conceptually? Say I have an airplane, similar to a Zenith 701. Say that it has a stall speed of 50 mph and a wing area of 60 sq ft, and it weighs ...
6
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1answer
300 views

How should a glider pilot handle inadvertently entering a foreign country?

Typically, when an aircraft lands on a different country than its departure, it has to land on an international airport. There many services are provided like customs, passport control etc, to make ...
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1answer
86 views

Refuelling an airbus to maximum

The airbus A350 aircraft when being refuelled seems to drop when the wings are filled.How much is the drop from empty to full.Thankyou
3
votes
1answer
161 views

On coaxial helicopters, how exactly does the yaw mechanism work?

This question asks how coaxial helicopters achieve yaw. The accepted answer correctly states that this is done by increasing pitch on one rotor while decreasing pitch on the other rotor, which leaves ...
0
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1answer
58 views

Are lhe old King KX170B Nav/Com radios monaural?

If so, does this mean I need to use an adaptor to play the output on stereo headphones? My Stereo-Mono switch does not produce a two-ear audio. Would this be solved with a converter? Would be nice ...
1
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2answers
265 views

Could the toilet be used as an extra passenger seat?

In the US, if the toilet had a seat belt, would it be legal for an airline to board one more passenger than the number of normal passenger seats, requiring that whoever used the toilet last must ...
1
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1answer
32 views

Reasonable values for neutral point and center of gravity

I understand that if the center of gravity is in front of neutral point, it is stable. If the center of gravity is behind the neutral point, it is unstable. Based on the diagram, is it implied that h (...
0
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1answer
71 views

At what angle-of-attack (sideslip angle) would a symmetrical vertical fin stop “helping” a deflected rudder produce sideforce? [duplicate]

For rudder deflection angles of 5, 10, 20, 30, and 45 degrees, at what (negative) angle-of-attack does a fin-rudder combination (including dorsal fin if present) create exactly the same amount of ...
0
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2answers
58 views

At what angle-of-attack (sideslip angle) would a symmetric vertical fin plus a deflected rudder have a lift coefficient of exactly zero?

For rudder deflection angles of 5, 10, 20, 30, and 45 degrees, at what (negative) angle-of-attack does a fin-rudder combination (including dorsal fin if present) have a lift coefficient of exactly ...
12
votes
7answers
1k views

Could flaps be raised upward to serve as spoilers / lift dumpers?

I should preface that I'm by no means an aviation person. I'm just in a aircraft knowledge obsession phase and daydreaming about designing my own ultralight (will never happen). The idea would be to ...
11
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10answers
5k views

What is the most 'environmentally friendly' way to learn to fly?

As this question indicates, I've been thinking recently about the environmental impact of flying (since when automated cars are the only means of ground transport, aviation will be responsible for ...
3
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1answer
2k views

What is this flat plate sticking out of the tail of Learjet 24D?

What is this protrusion on the tail of Learjet 24D (shown just above the avro museum logo) and what is its function? Learjet 24D Tail closeup Zoomed out image of the Learjet tail Source: images ...
10
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2answers
3k views

Why does Beijing's new Daxing airport have so few gates?

There is a lot of press about the Daxing airport, touting that it will be one of the largest in the world in terms of passenger capacity. The images of the terminal build are indeed beautiful. But ...
3
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1answer
68 views

Must a CFII be instrument current to provide instrument training?

Can a CFII conduct training for an instrument student in VFR conditions if the CFII isn’t instrument current?
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0answers
55 views

why are tips of airplane wings "bent' up? [duplicate]

Why are the tips of wings on new aircraft folded up? Is it safety or efficiency that is the concern? I have done multiple searches and all I ever seem to get are wingtip shoes!
9
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4answers
3k views

How and why does the ATR-72 sometimes use reverse thrust to push back from its parking position?

Travelling with Czech Airlines via Prague in an ATR-72 I have already experienced multiple times that instead of pushback service the planes simply used their reverse thrust to leave their parking ...
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4answers
301 views

Why don't short runways use (downhill) ramps for takeoff?

This is a followup on question: Why don't short runways use ramps for takeoff? There are multiple answers to that question that answer why an uphill ramp at the end of the runway does not make ...
3
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0answers
55 views

What is the procedure to appeal an FAA DPE who conducts exams in a manner that conflicts with certification standards?

Does the FAA have a formal process to allow applicants and instructors to appeal a DPE who does not conduct pilot examinations in a manner consistent with the ACS/PTS guidelines? If yes, how does ...
1
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3answers
148 views

Does a biplane need wing twist?

Does a biplane need wing twist? I understand wing twist is used to: creat a soft/partial stall ( hopefully create a partial stall before a full stall) balance the wing so a smaller horizontal tail ...
1
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1answer
83 views

Angle of attack from velocity vector

I found an equation to calculate angle of attack based on the velocity vector in the body frame of the aircraft. $\arctan(v_x/v_z) = \alpha$ 1) Is this correct? When I input in a $v_z$ approaching ...
2
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2answers
199 views

Is it useful for twin propeller airplanes to have twin vertical stabilizers, in line with the propellers?

In some twin propeller airplanes, there are two vertical stabilizers which are on the same line as the propellers. Is this shape helpful in terms of efficiency? Like this one (twin boom tail):

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