All Questions
1,261
questions with no upvoted or accepted answers
14
votes
0
answers
478
views
What causes the "dead band" phenomenon during takeoff on the Boeing 737?
During takeoff, the Boeing 737 encounters a distinctive "dead band" phenomenon after the initial pitch reaches approximately 10 degrees. Essentially, a slight increase in back pressure is ...
- 1,802
13
votes
1
answer
1k
views
Is there a good source for estimating the per unit cost breakdown for a classic GA plane like the Cessna 172?
For instance, on a Cessna 172 what percent is spent on:
Raw materials
Labor actually manufacturing the plane
Testing the completed individual planes
R&D Making the plane (at this point, very ...
- 1,349
10
votes
0
answers
259
views
Why did the F-4 Phantom have quite so many stencilled messages?
Anyone who has built a model of a US Navy or Air Force F-4 Phantom will know the misery of attaching literally hundreds of tiny stencilled informational notices all over its body.
Eduard 1:48 Tamiya ...
- 11.8k
10
votes
3
answers
1k
views
Do aircraft using only spoilerons for roll control, with no conventional ailerons, have a crossover airspeed?
Airplanes generally have a crossover airspeed (a minimum airspeed below which directional control of the airplane cannot be maintained in the event of a rudder hardover). This is because, as airspeed ...
- 28.1k
10
votes
0
answers
379
views
Who is this flyer seen in Oakland c. 1929?
Looking for identification of the man on the left. Second from left is W.A. "Sandy" Sanders, third is Denny Wright, and fourth is Clyde Sunderland.
Oakland, around 1929.
9
votes
2
answers
734
views
Do constant maximum lift to drag ratio variable pitch propeller exist?
Are there variable pitch propellers, where pitch is set so that the blades constantly are at their maximum lift to drag ratio AoA, whatever the incoming relative wind speed & direction?
Such a ...
- 4,454
8
votes
0
answers
192
views
How to interpret flight schedule data from before 1987
I'm trying to interpret schedule data from before 1987 (see example).
Example line:
...
- 81
8
votes
0
answers
650
views
How did Soapy get to fly Hornets?
Allegedly, in early June 1983, while flying a Sea Harrier during a NATO exercise off the coast of Portugal, Royal Navy's Sub-Lieutenant Ian "Soapy" Watson found himself in a rather ...
- 1,120
8
votes
0
answers
711
views
How can I convert a frozen ATPL from South Africa to an Iranian one?
I have got a frozen ATPL license from South Africa and I'm from Iran. I came back home last year and I have converted my CPL/IR license to the Iranian piloting license by doing Air Law and Human ...
- 159
8
votes
3
answers
683
views
Under FAA rules, can a private pilot act as PIC in aircraft furnished by someone else if they're not otherwise compensated?
Let's say I'm visiting a friend who happens to own an airplane, and I happen to be a private pilot holding a valid FAA PPL, as well as being familiar with the make and model my friend owns. Suppose my ...
- 296
7
votes
0
answers
489
views
Boeing 737-800 Source Off Light and Flight Director Bias Out Of View Function
I have seen the following occur during simulator events. With a left Source Off light illuminated and the captain's autopilot and autothrottles engaged (or re-engaged):
Captain's flight director ...
- 71
7
votes
0
answers
486
views
Which individual airframe has carried the most passengers in its lifetime?
I'm guessing that the airframe will be one of the 747s that service the domestic Japanese market, making regular short hops full of passengers - but perhaps actual figures exist to confirm this.
See ...
- 12.8k
7
votes
2
answers
1k
views
Which photo more accurately represents Flaps 1 in a 737-800?
or A recent update in a sim craft changed the visuals from what I'm used to, but from my research it looks to be more realistic. This post clearly reflects the more extended option being more ...
- 113
6
votes
0
answers
233
views
Why do the spoilers on the 737 only deploy to the flight detent after a flaps up landing?
Following an all flaps up (no flap) landing, the SPEED BRAKE
lever will not move beyond the FLIGHT DETENT and the spoilers
will not fully deploy (for reference this is stated in the Fcom 9.20.14 rev ...
- 213
6
votes
0
answers
124
views
Are there any analyses of GA tie-down failures?
After a big harbor storm, there are frequently analyses of why boats break free of their moorings. This information is used to improve upon best practices, resulting in fewer boats breaking free and ...
- 4,913
6
votes
0
answers
151
views
Can a non-US registered aircraft be based in the US?
I am a Swiss citizen and I might have to move to the US for a couple of years. I own a small plane in Switzerland (HB-registered) and I'd like to take it with me to the US. As my stay in the US would ...
- 61
6
votes
0
answers
394
views
Engine Bearings Damage in Radial Engines
Studying the P47's dive performance in DCS, I noticed how it's easy to damage the engine bearings if you windmill the prop at high speed.
Doing some research, I discovered that all radial engines are ...
- 319
6
votes
0
answers
398
views
What does the A340's underwing bulge (plastron) look like?
From Wikipedia:
From the start, engineers noticed that the wings were not stiff enough to carry the outboard engines at cruising speed without warping and fluttering. To alleviate this, an ...
user14897
5
votes
0
answers
162
views
Why For A320, On ground, reopening of the pack valve is delayed for 30-60 seconds
I've read in FCOM that, during engine start reopening of the pack flow valve is delayed for 30-60 s to allow second engine start? But isn't it that the pack flow remains closed only for the side the ...
- 689
5
votes
0
answers
229
views
How was the lost F35 from the Queen Elizabeth recovered?
In 2021, an F35 Lightning II from the Royal Navy carrier Queen Elizabeth crashed into the sea on take-off.
It was later reported that the aircraft was recovered from a mile below the Mediterranean.
...
- 391
5
votes
0
answers
329
views
Why do all trend vectors in the G1000 on airplanes indicate the status 6 seconds later? Why 6? Why not 5 or 10?
Why do all trend vectors in the G1000 on airplanes indicate the status 6 seconds later? Why 6? Why not 5 or 10? The fact that the trend vector shows after 6 seconds allows us to turn 3 degrees per ...
- 2,049
5
votes
0
answers
153
views
Why are emergency parachutes for pilots so heavy?
Parachute technology doesn't seem to have got much lighter in the past few decades. It seems that most emergency parachutes designed for pilots still weigh about 15 lb. And yet a Cirrus BRS designed ...
- 1,549
5
votes
1
answer
177
views
Effect of leading edge contamination wing performance
When a wing accumulates irregularities such as insects or dirt on the leading edge, its performance decreases. There are two main effects of this which are explained in https://aviation.stackexchange....
- 181
5
votes
0
answers
278
views
Why is this placard on a Boeing 737 NG?
I was working on the cockpit of a Boeing 737 and was intrigued when I saw this placard. From what I know this has to do with Citibank being a lender or something along those lines.
Why would this be ...
- 185
5
votes
0
answers
97
views
How dangerous (or not) are some synthetic types of aviation hydraulic fluids based on organophosphates?
Insider's January 13, 2023 Gerard Butler says he mistakenly rubbed acid all over his face while filming 'Plane' and didn't realize until he was 'burning alive' links to the Late Night with Seth Meyers ...
- 5,758
5
votes
0
answers
1k
views
Why isn't Yamaha EPeX300Ti more popular in aviation?
The answer to this question might be obvious to experienced aviators. But as an armchair enthusiast, I really couldn't find a satisfactory answer anywhere on the internet.
Below two pages came from ...
- 51
5
votes
0
answers
289
views
Who was the first person to break the sound barrier?
While watching this video on Wikipedia of Chuck Yeager breaking the sound barrier in the Bell X-1 in level flight, I noticed the narrator say: "For the first time, except in dive, a man has flown ...
- 151
5
votes
1
answer
306
views
Where does the FAA define the dimensions of Terminal Radar Service Area (TRSA) airspace?
The airspace over the United States is classified into various areas of "alphabet" airspace (A, B, C, D, E, G). This is known as "regulatory" or "rulemaking" airspace ...
- 13.4k
5
votes
0
answers
348
views
When did FedEx acquire it's current callsign and airline ID's?
FedEx currently uses the callsign "FedEx" and has the IATA and ICAO ID's of FX and FDX respectively.
Back in the 1990's they used the callsign "Express" and the IATA code was FM. (...
- 28.4k
5
votes
0
answers
443
views
Why is the F-104 Starfighter’s afterburner thrust not greatly impacted by altitude?
Here is a page from the F-104 flight manual. It shows the flight envelope for the F-104 Starfighter with the powerful J79-GE-19 turbojet engine:
I have a question regarding the shape of the ...
- 111
5
votes
0
answers
346
views
How did the Blackops 'quiet one' helicopter muffler work?
Back in the Vietnam War era, special ops needed a quiet means of inserting soldiers behind enemy lines to install eavesdropping equipment. They modified a Hughes 500 to do the job. One of the things ...
- 19k
5
votes
0
answers
2k
views
Can I buy a A320 FCOM, FCTM and QRG as non-pilot?
I am very interested in the Airbus Systems. I really like the FCOM of the A320, there are some of them on the internet.
However, I like holding physical books in my hands more, than reading them on a ...
- 8,982
5
votes
0
answers
286
views
How is the required motor power calculated for a quadcopter?
I've been trying to find the required motor power for a quadcopter. I first calculated drag power and then I made a linear trend line for motor power against motor weight. I made the motor power 1.5 ...
- 151
5
votes
0
answers
242
views
Why is this G-AIRMET's valid time earlier than its issued time?
For this G-AIRMET map, why is the valid time earlier than the time it was issued?
- 125
5
votes
1
answer
434
views
Why is there no Maltese Cross in this non-precision approach's profile view which has a FAF?
I am wondering why this chart does not show the FAF with a maltese cross as it is used in non-precision approaches to depict FAF.
- 2,049
5
votes
1
answer
732
views
What job opportunities are there for low time pilots in Malaysia?
Does a new pilot who has just obtained ATPL license has job opportunities?
When I search at pilot job offered on Internet, they mostly required more than 3,500+ flying hours. What I knew about those ...
5
votes
1
answer
372
views
Can pilots take multitools on board in Canada?
Can pilots in other countries or Canada carry Swiss army knives onboard on commercial flights? Passengers are not allowed to do that in Canada.
- 807
5
votes
1
answer
425
views
Do Red Bull Air Race aircraft make use of nitrous oxide injection?
Microsoft Flight Simulator X contains Red Bull Air Race missions where the player flies an Extra 300S through a race course and makes use of Nitrous Oxide injection for the engine. While I have heard ...
- 72.8k
4
votes
1
answer
597
views
With the new MOSAIC rule, would it allow for me to operate my Cessna 172 as an LSA and install experimental avionics?
I know it's still early with the FAA’s Modernization of Special Airworthiness Certification (MOSAIC) Notice of Proposed Rulemaking, but as it is currently written (August 2023), could I operate my ...
- 8,392
4
votes
0
answers
233
views
What do I need to do to fly a Microlight to France?
I wish to fly a C42 to France from the UK. I can file the flight plan from Skydemon, but I have an NPPL, so I believe I need to obtain permission from French authorities and maybe do other things.
...
- 12.5k
4
votes
0
answers
78
views
Does the FAA Publish the Latitude/Longitude of Parking Locations?
In Jeppesen charts, it's known that they provide the latitude/longitude of gate locations at airports. I was wondering if the FAA had a source for the same information, like their international ...
- 41
4
votes
0
answers
176
views
Why Ryanair flies from both Stansted and Luton as they are very close
I am doing a research on my future trip from the United Kingdom to the Republic of Ireland and noticed Ryanair flies from both Luton and Stansted to there. Those two airports are quite close to each ...
- 191
4
votes
0
answers
69
views
Why do some turbofan-engined Caravelles, but not all, have an anti-shock body at the root of the horizontal stabilizers?
Many turbofan-engined Caravelles have a prominent anti-shock body where the horizontal stabilizers attach to the vertical tail, about a quarter of the way up the latter. (Turbojet-engined Caravelles ...
- 28.1k
4
votes
0
answers
195
views
Why did this flight descend way below usual path?
I flew on UAL2086 last night which is a regularly scheduled flight from KIAH to KLAS, this particular plane was a 737-900 - N79402. We took off early and had no issues until we arrived in Arizona when ...
- 41
4
votes
0
answers
394
views
Why do ATR aircraft have a dedicated power management selector for each engine?
ATR aircraft have a split power management selector in order to allow both engines to be commanded seperately.
Source: Magnar Nordal
but what is the purpose of having this facility? do pilots ever ...
- 2,959
4
votes
0
answers
394
views
RR Ultrafan: Why the dramatic change of fan blade design?
The Rolls Royce Ultrafan prototype has been in development for a few years and has usually been seen in the media with very distinctive curved leading edge design as such:
However, this week (...
- 191
4
votes
0
answers
540
views
Why are there two different throttle designs for the 757 and 767?
There is this one, which seems to be the older version. Notice there is a big gap between each lever, except at the top.
And this one. Notice there is almost no gap between each lever, making it ...
- 1,657
4
votes
0
answers
202
views
Can one presently register a new flying car in the US as an aircraft and as an automobile?
Can one presently register a flying car in the US as an aircraft and as an automobile?
I understand there is a 1956 Taylor Aircar for sale which is registered and seems to have an automotive license ...
- 1,039
4
votes
0
answers
249
views
Is Airbus offering to retrofit older A350s with the new winglets?
I noticed that new winglets (sharklets?) on the A350 are extended as part of the PIP (Performance Improvement Package).
Are older A350s being retrofitted with the new sharklets? Does Airbus even offer ...
- 379
4
votes
0
answers
160
views
Anybody recognise the model of ADI on the XB-70?
Is this a model that was used on other aircrafts of the era, too? Looking for technical information about it and knowing the manufacturer and model number would make that easier.
The Interim Flight ...
- 746