All Questions
23,495
questions
-2
votes
0
answers
33
views
Dust protection device in Mi-17 helicopter
Why Mi-17 helicopter Dust protection device is not effective above altitude of 3000 meters ?
- 431
0
votes
0
answers
19
views
Is there any authoritative source where I can find a list of companies producing Sustainable Aviation Fuel in the U.S?
Is there any authoritative source (website, directories, etc.) where I can find a list of companies producing Sustainable Aviation Fuel (SAF) in the U.S?
Based on media reports it seems that there are ...
- 1,291
0
votes
0
answers
17
views
How would I go about finding stall/loiter speed data?
I have a list of 6 fixed-wing and 2 tilt-rotor aircraft that I require the stall and loiter speeds for, however I have great trouble finding these. Is there a book or website that has an extensive ...
1
vote
0
answers
14
views
ADSB DF17 Altitude decoding
I develop ADSB DF17 messages decoding device.
I see that barometric height decoding differs between documents, describing the encoding standard:
https://mode-s.org/decode/content/ads-b/3-airborne-...
- 11
1
vote
1
answer
96
views
Why does an aircraft fly a looping when pulling the stick?
let's assume an aircraft flies in straight level flight in the direction of an x-axis with an angle of attack of 3°. When the pilot pulls the flight stick, an additional lift is produced which acts ...
- 11
3
votes
1
answer
986
views
Why don't piston engines feather on shut down?
When turboprops shut down, they feather the propellers. If piston aircraft did this, would it ruin the oil system? Also, why do pilots feather very quickly when doing the engine run-up?
- 3,552
1
vote
1
answer
19
views
How to determine the required twist in the Bell Shaped Lift Distribution (BSLD)
I'm doing a research about flying wings and BSLD and I'm having trouble to find the required twist. I'm using the equation L = ( 1 – x^2 )^3/2 to find the local load (Bowers, 2016). But how can I ...
- 11
4
votes
1
answer
83
views
Do the A220's controls have force feedback for dual pilot inputs?
Airbus's 3x0 series designs have often been criticized following incidents and accidents over the relative lack of haptic feedback on the control sticks. Dual input conditions give a visual (and aural?...
- 253
-3
votes
0
answers
146
views
A great action photo - but any details? [closed]
Any idea when or where this was taken? It looks like a Blériot about to fly.
- 7
1
vote
0
answers
43
views
aerodynamic forces on an engine cowling
In Mendenhall's book about the Gee Bee racers, he describes that on the Models Z, R-1, and R-2, there was a strong tendency for the engine cowl to get pulled forward and into the prop during races, ...
- 18.7k
1
vote
2
answers
66
views
Why does the FAA have a daily DOF and another that's only updated every 56 days?
The FAA has a Digital Obstacle File (DOF) which reports on tall objects that would be important for pilots which is updated every 56 days. https://www.faa.gov/air_traffic/flight_info/aeronav/...
- 111
1
vote
0
answers
59
views
Inconsistent ARINC 717 Barker Codes
I've been trying to decode a file that is (supposedly) ARINC 717. According to all the literature I've been able to find on ARINC 717, the data should be separated into 4 repeating, one second frames, ...
- 11
5
votes
1
answer
2k
views
Any ideas on what this aircraft is? The number 5964 is printed in the negative
Any ideas on what this aircraft is? The number 5964 is printed in the negative
- 51
0
votes
0
answers
115
views
How can I determine the fuel temperature in the tanks of an airbus a320 during climb? [closed]
For example during climb at 10000ft the outer temperature is around - 10 C. How can I calculate the fuel temperature in the tanks or are there any free data? In technical notes I find on the internet ...
- 23
2
votes
1
answer
198
views
What is the difference between DH and RA in Jeppesen charts?
In CAT II and CAT III Approach Charts, the Jeppesen version of charts depicts both the "DH" and the "RA".
And, I found out that they are somewhat different.
So, why do these ...
- 171
0
votes
1
answer
124
views
Does parasitic drag increase exponentially with velocity?
A deep dive into the Cessna 172 POH showed a remarkable linearity between rate of fuel consumption and velocity at various cruise power settings ranging from 55 to 75%. Originally a study of ...
- 16.7k
1
vote
1
answer
55
views
What is the Surface Management (SMAN) all about?
Like AMAN (Arrival Management) and DMAN (Departure Management), what is the SMAN (Surface Management) all about? Is SMAN a studied concepts, or is it a technical system ?
If the SMAN is rather a ...
- 19
2
votes
0
answers
39
views
Can someone under training of MPL(A) or CPL(A) attain a PPL(A)? That is, is it possible to attain multiple licenses simultaneously?
As the title says, is this possible according to EASA?
According to the Swedish authorities, EASA do not allow attaining a second license before completing the first. But I have a hard time finding ...
- 21
-4
votes
0
answers
57
views
Chat GPT's Formula for thrust may/may not be wrong [closed]
I was asking chat gpt questions and got this. It seems like 1 lb/f is way too low.
- 119
1
vote
1
answer
101
views
Could a Cessna Caravan be outfitted with Wi-Fi?
From what I understand, both ATG and satellite Wi-Fi require substantially large antennas to send and receive signals in large commercial airplanes.
Could a system like this be outfitted on a Cessna ...
- 1,543
1
vote
4
answers
173
views
Is it normal to fly or glide only one mile per hour above stall speed?
At one point, Through Gates of Splendor describes Nate Saint gliding in his Piper PA-14 Family Cruiser at 45 mph; the plane's stall speed is 44 mph. Earlier in the book, he flew at 45 mph. Is it ...
- 2,674
-1
votes
0
answers
87
views
What is this Boeing 777-9 flight operated by Boeing for?
What is the purpose of this flight? I assume it's a test flight of some type?
- 2,674
0
votes
0
answers
35
views
Calculating True Course, Magnetic Heading and Compass Heading when Wind, True Heading, Magnetic Course and Deviation is known
I came across another exercise while studying for my PPL(A) exam where I would need some help with some calculations.
The question sounds like this:
Given: WCA: -012°; TH: 125°; MC: 139°; DEV: 002°E ...
- 323
0
votes
0
answers
53
views
Low reynolds number in Helicopters [closed]
What are the problems related with limited (low) reynolds number in Helicopters?
2
votes
1
answer
89
views
Is more information available about missionary pilot Nate Saint's backup fuel system described in "Through Gates of Splendor"?
I'm currently reading the book Through Gates of Splendor, and at one point (pages 61-63 in the first edition, about halfway through Chapter 5), it describes a system invented by missionary pilot Nate ...
- 2,674
1
vote
0
answers
45
views
What are lateral boundaries? [duplicate]
In regard to:
103.17 OPERATIONS IN CERTAIN AIRSPACE No Person may operate an ultralight vehicle within Class A, Class B, Class C, or Class D airspace or within the lateral boundaries of the surface ...
- 21
1
vote
1
answer
113
views
Can a private pilot flying a passenger to a hospital use a MEDEVAC callsign?
Normal air ambulance flights in medical emergency situations use a callsign consisting of the word "MEDEVAC" followed by the registration number excluding the prefix (e.g. N912MF is "...
- 2,674
3
votes
1
answer
102
views
Was there any attempt on making a turbofan for mach 1-2 with a "decelerator" air intake?
What made me ask this question is the SR-71 hybrid engines and the efficiency difference between certain engines.
Here is an article from wikipedia showing the efficiency of the engines accordingly to ...
- 101
2
votes
1
answer
71
views
Faults on Gulfstream G550/C-37B repairable in < ~3hrs without aircraft specific tools or spares?
Endeavouring to meet your requirements for specificity. brevity, question as title, etc.
I am an author seeking a realistic fault/issue for a Gulfstream G550/C-37B meeting the following criteria:
1/ ...
- 121
1
vote
1
answer
63
views
Why DA40 got some aircraft variants with gust lock on the left seat and some on the right seat?
I noticed that the gust lock position differs for some DA40 aircraft..what are the reasons for such difference in mechanical design?
- 11
25
votes
7
answers
5k
views
Why is carb icing an issue in aircraft when it is not an issue in a land vehicle?
As far as I know, the mechanics and physics of an aircraft carburetor are the same as those of an automobile carb. (If I'm wrong, there is no basis for this question.) Aircraft carbs are provided with ...
- 15.5k
1
vote
3
answers
244
views
Why should the leading edge of the horizontal tail be lower than the trailing edge? [duplicate]
As mentioned in this answer: https://drones.stackexchange.com/a/2564/5088
The leading edge of the tail should be lower than its trailing edge, providing some "down force" in flight.
I am ...
- 113
12
votes
3
answers
6k
views
Is a broadhead arrow fired from a bow or crossbow a significant threat to the safety of a civilian helicopter?
Let us suppose that we have a civilian helicopter, such as an MD900, Bell 407, Robinson R44, Bell 47 or another common civilian design, hovering or flying slowly just above treetop level (50-70m).
If ...
- 483
25
votes
1
answer
6k
views
Why are there 6 airports that straddle the Canada–US border?
I read on the Wikipedia page for the Avey Field State/Laurier Airport:
Also known as Avey Field State/Laurier Airport, it is one of six airports that straddle the Canada–US border. The others are ...
1
vote
2
answers
102
views
What causes a slip/skid turn? [duplicate]
Is the rate of turn being too low/high for a given bank angle the cause of slip/skid turn? Or is it yawing too much inside/outside turn causing an imbalance in centripetal/fugal force and thus the ...
- 33
13
votes
3
answers
6k
views
Why do airspace shelves look like upside down wedding cakes?
Is it because the majority of traffic comes from higher altitude?
- 3,552
0
votes
0
answers
4
views
Tail sizing for small aircraft [Drones] [migrated]
hope you all are having a lovely day.
I am a novice designing a 3D printed, fixed wing drone as a personal project. The mission objective is maximum endurance (and a decent range too). It has a MTOW ...
- 1
-2
votes
0
answers
57
views
What are the twin engine propeller aircraft effects on the lift distribution?
What are the effects of twin engine propeller aircraft on the lift distribution of a wing?
0
votes
0
answers
13
views
How can I calculate the weight needed in the nose? [migrated]
I have built this plane:
But the nose cone is too light. I have tried adding different objects in the front but each thing was either too light or too heavy. How can I calculate the weight needed in ...
- 113
-2
votes
0
answers
33
views
Ducted multi-blade fan shaft consumed power calculation analysis
Input data:
Custom design multi-blade fan. Design created in Solidworks.
Fan diameter 300mm, blades qty 16. I used it as started point to understand how all this is working.
Investigation results.
...
- 1
0
votes
0
answers
42
views
What are the origins of velocity (V infinity) components? [closed]
A flying airplane has two velocity components, axial and tangential, what are the origins of these velocity components V(a) and V(t)?
1
vote
1
answer
89
views
Causes of yaw in slip/skid turn [closed]
Why does the plane yaw when the rate of turn is not suitable to bank angle in a turn? In a slipping/skidding turn, there is an imbalance of centripetal/ centrifugal force. How does that cause a yaw?
- 33
-1
votes
0
answers
33
views
Why elliptical wings are optimal for low induced drag? [duplicate]
It's believed that the main advantage of the elliptical wings is the low induced drag at very high altitudes. Can you prove this by the aid of a relevant equation?
11
votes
2
answers
2k
views
How can ice form in an OAT of +20°?
According to a question that I came across while studying for my EASA exam on Aircraft General Knowledge, "icing" is most likely to happen in an OAT between "Between -5°C and +20°C"...
- 323
0
votes
2
answers
119
views
Centrifugal force created by a 1045 propeller
I currently am creating a project in which I'm using a 1045 propeller with a BLDC motor that spins at ~16,000RPM. It is powering a single motor "rocket" that basically is configured to carry ...
- 59
1
vote
1
answer
55
views
What is the working principle of a dorsal fin? [duplicate]
In simple words could someone please explain the working principle of a dorsal fin in a two engined propelled airplane?
0
votes
0
answers
75
views
Why is the APU controller and ECB located aft without ventilation on Boeing and Airbus aircraft?
On Boeing and Airbus aircraft, the APU controller and electronic control box (ECB) is located aft. Why is it located here, where no ventilation is available?
Why it is isolated from different line-...
0
votes
1
answer
187
views
Why descend after a single engine failure in an Airbus?
The procedure says to descend to lrc ceiling. But, why do we need to descend?
The aircraft is still able to maintain speed even at higher altitudes,
at FL300, in FS2020, it was maintaining around 215-...
- 669
0
votes
1
answer
55
views
Would an Autogryro/Gyrocopter with wings be safer than a normal autogyro in a negative G situation?
Typically Autogyros experiencing "negative Gs" will crash.
I wonder if an Autogyro with wings would work as a fail safe for this situation? Would it allow the pilot to recover assuming this ...
0
votes
4
answers
252
views
Can commercial aircraft harvest CO2 usefully and economically inflight?
The principles involved in the. railcar-based method of Direct Air Capture (DAC) as explained in the July 20, 2022 Vol 6,Issue 7 of the. scientific. magazine Joule and now being developed. by Texas ...
- 19