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Is the yaw damper on modern airliners safety critical? [duplicate]

Question is inspired by the recent Southwest 737 MAX Dutch Roll incident. The news articles said the crew "regained control", which implies that the aircraft was out of control prior. I did ...
Paul Kern's user avatar
6 votes
2 answers
341 views

How to calculate velocity of air behind a propeller?

Background: I came across this article by Gabriel Staples to calculate static and dynamic thrust of a propeller. In the derivation, it was assumed that the exit velocity is equal to the pitch speed of ...
NeelD's user avatar
  • 79
0 votes
1 answer
61 views

Why will the max lift point not be at the center of a swept but constant chord wing?

(In this question when I say "swept wing" it means the blue wing seen at the bottom. So no fuselage or anything) If you look at this graph from this answer, you'll see the max lift point of ...
Wyatt's user avatar
  • 2,666
1 vote
1 answer
46 views

Understanding the constant speed prop and 2-4 degrees optimum

I've read through some answers on here and just wanted to write my own description of how this works and let someone check for me. Currently I've just started to fly an King air 100 with PT6A We ...
Ollie Seaward's user avatar
0 votes
0 answers
64 views

Why do some GA aircraft use bungees or torque tubes vs. cables for control surface actuation?

Why do some GA aircraft use bungees or torque tubes vs cables for control surface actuation? I understand using cables is the most common for GA aircraft. I understand bungees are common in gliders ...
Fred's user avatar
  • 1,313
1 vote
1 answer
51 views

What happens in order to make a shock when the flow first turns?

Imagine you have a really zoomed in view of a 2d ramp, which is at 20 degrees. Zoom in on the exact point the ramp turns from horizontal to 20 degrees. When the first supersonic air molecules reach ...
Wyatt's user avatar
  • 2,666
0 votes
1 answer
60 views

Do you have to repeat back ATC taxi instructions while still on the runway [duplicate]

Upon touching down while still rolling, tower gives us taxi instructions back to parking. I understand the need to give instructions on where to exit the runway but I’m wondering if the FULL taxi ...
Emma141822's user avatar
0 votes
1 answer
88 views

Three-blade propeller balancing

I'm balancing a three-blade propeller. The propellers weigh exactly the same to the 10th of a gram. When I place it on shaft with a very sensitive wheel bearing, one of the blades always moved ...
Ricardo Zelaya's user avatar
2 votes
1 answer
108 views

Why will the pressure distribution of a swept wing promote stall?

Here it explains how the bound vortex will change the lift distribution of a wing. What is meant by the lift distribution changing is that there is less lift at the tip, meaning the pressure ...
Wyatt's user avatar
  • 2,666
1 vote
1 answer
56 views

McCauley propeller models IC235/LFA7570 and IA170E/JHA7660

I am writing to inquire about the pitch specifications for the following McCauley propeller models: IC235/LFA7570 with a maximum diameter of 75 inches and minimum diameter of 74 inches. IA170E/...
rafael rosolen's user avatar
2 votes
2 answers
89 views

Holding time during static structural testing of a composite wing

While doing a static structural testing of a composite wing (high aspect ratio or otherwise), is there an industry practice or standard that determines the holding time for which a load is applied ...
Yasir Zahoor's user avatar
13 votes
1 answer
3k views

What type of aircraft is this?

Flew very low in circles around my house this morning. I live near Fox Harbour airport in Wallace, Nova Scotia Click to embiggen
H D's user avatar
  • 133
2 votes
1 answer
66 views

EASA Regulations regarding Private Aircraft for PPL training

Can somebody advise what are the EASA specific regulations that apply regarding the use of a privately registered aircraft for PPL training? Links in particular to the EASA website would be greatly ...
Alex's user avatar
  • 21
1 vote
1 answer
51 views

SERA.8012 and ATS.TR.220 Wake Turbulence Separation application

I need small clarification on current European documents SERA and Part-ATS. Based on SERA.8012(a): (a) Air traffic control units shall apply wake turbulence separation minima to aircraft in the ...
Bohdan Bessonov's user avatar
1 vote
1 answer
120 views

How does the downwash behind a swept wing differ from a normal wing?

How does the downwash behind a swept wing differ from a normal wing? (I know you can’t trust everything you see on the internet, but this seemed legitimate) Here it said: The downwash pattern on a ...
Wyatt's user avatar
  • 2,666
4 votes
1 answer
248 views

What is the purpose of these round paved pads?

What is the function of these round pads at KMWH, Grant County International Airport, in Moses Lake, WA? They appear to be sized to allow an aircraft to turn around, perhaps under its own power or for ...
p8l's user avatar
  • 303
1 vote
1 answer
62 views

Where do I find the requirement for an AFM to be serial number specific?

It seems to be generally accepted that an AFM must be serial number specific to that aircraft it was made for and delivered with. I am having difficulty finding the reference for "serial number ...
Will Hecox's user avatar
1 vote
0 answers
141 views

Need help Identifying Aircraft Panels

I have the following aircraft panels which I would like to Identify and get an understanding of its value. Any help is greatly appreciated! First Panel: Length: 19 ½ in. Height: 8 in. Second Panel: ...
SDASM's user avatar
  • 11
5 votes
3 answers
2k views

Structure that holds the twin-engine on an aircraft

What is the name of that big structure (in red) that holds the engine?
Josué Lima's user avatar
24 votes
3 answers
7k views

Can someone explain the damage distribution on this aircraft that flew through a hailstorm?

An A320 flew into a hailstorm 20mins from landing. I’m intrigued by the damage distribution. Seems like everywhere else wasn't touched at all. Why?
Tomoe's user avatar
  • 241
2 votes
0 answers
54 views

Relation between Saab B3LA concept aircraft and AMX International

The Saab B3LA aircraft concept and the AMX aircraft were developed around the same time and out of similar requirements. According to the Swedish Wikipedia: The [B3LA] project was abandoned in 1979 ...
Pibben's user avatar
  • 121
8 votes
1 answer
1k views

Airplane Owner, But don't have PPL. Can student pilot do oil change on their own plane?

Airplane Owner, But don't have PPL. Can student pilot do oil change on their own plane? I can't seem to find answer on this. Any helps would be great.
Kim Huang's user avatar
6 votes
1 answer
6k views

Am I seeing double? What kind of helicopter is this, and how many blades does it actually have?

This June 9, 2024 CNN news video begins with an inset of video of what looks like an Israeli IDF "event". Looking down from a relatively static point in the air, another helicopter is seen ...
uhoh's user avatar
  • 6,028
1 vote
2 answers
360 views

Why hasn't there been an alternative to jet engines yet?

Why do airlines and military jet aircraft still use jet engines after 85 years of the introduction of this technology? Why hasn't there been a viable alternative to jet engines yet, even though this ...
user366312's user avatar
0 votes
0 answers
77 views

Any one met this trouble on E4-C engine? [closed]

I cannot read the flight data on AE300-Wizard, and it shows "File contains no valid record manager sectors or is corrupt." I plan to re-import the E4-C update file. Any solid advise on this ...
CuriousFlyman's user avatar
1 vote
0 answers
22 views

Is QNET 2.0 VTOL Board Underactuated or Fully Actuated?

I'm working on a VTOL aircraft model, but the apparatus available in our lab is the QNET 2.0 VTOL Board. The help I need is to confirm whether the VTOL Board is underactuated or fully actuated. As you ...
xerox's user avatar
  • 11
0 votes
0 answers
43 views

What are the maximum dimensions and weight per piece that can be loaded on a 737-800BCF (Boeng Converted Freighter)

The 737-800 Boeing Converted Freighter aircraft cargo specs are widely available on the Boeing and other related websites, but the actual per piece maximum dimensions and weight than can be fitted on ...
Costi Mitri's user avatar
2 votes
1 answer
60 views

How to calculcute variation and compass deviation in this CDMVT problem?

Usually I can solve CDMVT problems, but sometimes I feel I'm missing something important. For example: I'm able to solve: Given WCA -012, TH 125, MC 139, DEV 002E. What are TC, MH and CH? ...
Mandal Vomva's user avatar
0 votes
1 answer
96 views

Why are shockwaves allowed different angles at different distances from a body?

It's been (well) established that a shockwave can only be at the angle of the Mach cone. (I now understand this part). However, in this picture: you can see that the shock is at 2 angles. I also ...
Wyatt's user avatar
  • 2,666
0 votes
0 answers
35 views

Are the spring constant and damping coefficient of landing gear publicly available?

I'm trying to find the spring constant and damping coefficient for a Cessna 172. I looked through the POH, but couldn't find them anywhere. Are these values available publicly in some design document ...
cph2117's user avatar
  • 245
3 votes
1 answer
234 views

Dyke Delta dynamics?

I recently came across the Dyke Delta, designed by John Dyke. It is a delta wing (more like diamond planform) homebuilt. I'm curious about how this airplane handles, considering delta wings have some ...
Slick Tires's user avatar
-2 votes
0 answers
64 views

What is the reason that Iranian Shahed-type drones have become so popular with Russian forces? [closed]

What is the reason that Iranian Shahed-type drones have become so popular with Russian forces? What is special about Shahed, which is a very low-tech drone that allegedly uses noisy moped engines?
user366312's user avatar
0 votes
2 answers
56 views

Why will a slower moving parcel of air above a wing create drag in non-inviscid flow?

This answer explains why a thicker boundary layer will cause a type of form drag. It uses inviscid flow to explain this. It is a great answer, but I can't seem to see how this applies in a real world ...
Wyatt's user avatar
  • 2,666
3 votes
1 answer
147 views

What percentage of airliners today operate with unaugmented GPS equipment?

Responding to this question there was some discussion on GPS equipment and whether it used augmentation (WAAS/SBAS/GBAS) or not. What percentage of airliners operate with unaugmented GPS equipment? ...
Pilothead's user avatar
  • 20.7k
4 votes
2 answers
85 views

ILS Designated Operational Coverage (DOC)

During a standard Instrument Landing System (ILS) approach, I typically arm the VOR/LOC (Boeing 737) to capture the localiser1 once on an intercept course. Upon clearance for the approach, I then arm ...
tedioustortoise's user avatar
1 vote
3 answers
239 views

How do the landing gears support so much mass?

The first thing that one notices after seeing an aircraft, is that it's quite a heavy flying machine. And so, one would expect monumental tires on these vehicles, but yet they don't exist? How is it ...
Aerospace_Nerd's user avatar
1 vote
1 answer
160 views

How are military aviators call signs made?

Military aviators always have a call sign that they are referred to as. I would like to know how they are picked? Is it their personality, surname or what?
James Bolus's user avatar
22 votes
2 answers
5k views

Why do airplanes sometimes turn more than 180 degrees after takeoff?

Why do sometimes (at least in commercial flights) airplanes do a more-than-180-degrees loop after takeoff, in order to aim at the target direction? See image for an example. I guess that it is part of ...
Riccardo Ceccon's user avatar
10 votes
1 answer
152 views

Is there any version of CFM56 with can combustors?

This lamp is sold online: They claim it's made from a CFM56 combustion chamber. It looks like a can combustor, and I read everywhere that CFM56 uses an annular combustor. Is there a version of CFM56 ...
Evariste's user avatar
  • 203
4 votes
1 answer
345 views

Which underwater crash sites of medium to large aircraft have been captured in sonar imagery?

For which crash sites of medium to large aircraft are sonar images available ? Scope: The crash site should already be confirmed (not speculated). For the purpose of this question, let's define "...
summerrain's user avatar
  • 3,474
1 vote
0 answers
76 views

Twin engine or single engine with parachute, which is safer?

Statistically speaking, if we compare two airplanes: a twin engine (like the Beechcraft Baron) VS a single engine with a parachute (like the Cirrus SR22), if we add up all posible emergency events(...
Gabe's user avatar
  • 3,327
3 votes
1 answer
76 views

Flying N-registered Aircraft in the EU (as an EU resident)

Until recently, I believed what the old, wise men of my local flying club had been telling me for years: You can fly N-registered aircraft in Europe... as long as you have an FAA license. I recently ...
Wasserwaage's user avatar
  • 1,694
2 votes
1 answer
61 views

How does a thickening boundary layer create form drag?

Imagine a normal wing with flow over it, and to simplify things it's at 0 AoA. Drag is being made mainly because of form drag and skin friction drag. I'm not sure on this, but I don't think there ...
Wyatt's user avatar
  • 2,666
3 votes
2 answers
159 views

A question on stalling and flat spin - in gliders

Very short version: Do gliders do stalls, and flat spins, as aerobatic tricks (as do say aerobatic biplanes). -- As I understand it, with an aerobatic plane, a pilot can and does, for "fun" ...
Fattie's user avatar
  • 1,932
3 votes
1 answer
147 views

What's the precision difference between ILS and GPS(LNAV/VNAV)?

What is the precision/accuracy difference between both GPS (LNAV/VNAV) and ILS?
Gabe's user avatar
  • 3,327
21 votes
1 answer
3k views

Vintage photo, Seatac airport

I’m spending the night in a hotel at Seatac Airport in Seattle, Washington, USA. The vintage photo below is hanging on the wall of my room. I recognize the airport as Seatac, circa 1950’s. The photo ...
Stu Smith's user avatar
  • 521
5 votes
1 answer
151 views

How did the Concorde’s glide ratio vary from takeoff to supercruise?

I can't seem to get straight numbers on its glide ratio. One source claims 4:1 at takeoff and 12:1 at transonic speeds. But what about the supercruising phase that it's flight was optimized for?
Kevin Kostlan's user avatar
6 votes
4 answers
2k views

How do planes deal with excess lift at high speeds?

If I understand correctly, wind force increases quadratically as airspeed increases. Therefore, all other things being equal, lift should also increase quadratically. Does that mean, a plane going ...
CaptainCodeman's user avatar
3 votes
1 answer
181 views

What limits automated direction finding from working over oceans?

Automated direction finders are only reliable in relative close proximity to NDBs, due to various adverse effects. In particular, the night effect limits their useful range for navigation ...
lxgr's user avatar
  • 261
5 votes
2 answers
111 views

Do vtails need twin horizontal trim tabs?

Do vtails need twin horizontal trim tabs? As vtail aircraft don't have a separate horizontal tail, do they need a trim tab on both rudervators?
Fred's user avatar
  • 1,313

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