All Questions
24,972
questions
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Exhaust temperature of CFM56 engines range (Nozzle downstream temp)?
EGT is available but not the temp of the exhaust nozzle in the CFM56 series.
- 1
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0
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2
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Exhaust temperature of CFM56 engines range (Nozzle downstream temp)?
EGT is available but not the temp of the exhaust nozzle in the CFM56 series.
- 1
0
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0
answers
17
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what is the difference between RVR 200m and R 200m (LVO jeppesen landing minima)
sometimes JEPPESEN approach chart shows low visibility landing minima as RVR in meter or sometimes just R in meter. What is difference….
- 101
2
votes
1
answer
135
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Why isn't the rudder below the tail?
Most airplanes have a rudder on top of the tail. When it is turned to the left, it causes the plane to yaw to the left. But it also puts a roll force to the right, because it is usually above the ...
- 21
1
vote
0
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23
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MAP in profile view of approach plate
I understand that the start of the dotted arrow on the profile view of an approach plate shows the MAP for the precision approach on a plate if the plate combines more than 1 (for example, a plate ...
- 121
1
vote
0
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73
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Why is spanwise flow more prevalent in the boundary layer?
Spanwise flow is stronger in the boundary layer, but to me it's kind of counterintuitive because the BL flow is slowed down by friction, experiencing less of a pressure gradient over the wing, ...
- 435
2
votes
0
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65
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767 fuel line issue
Recently flew a 767 that needed to turn back after about 45 minutes b/c, according to the pilot, fuel was only being pumped from one tank, which could lead to an imbalance if left to continue.
...
- 233
0
votes
1
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32
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What's the most cost-effective way to get a group to get their Junior HPR Level 1 certification?
I'm apart of Civil Air Patrol and trying to get other cadets to get their Advanced Rocketry certificates, but the Challenger (Stage V) phase requires a completion of a NAR Junior HPR L1 certification.
...
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0
answers
38
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IFF Planar Array [closed]
I'm trying to develop a new IFF planar array for ATC. Anyone can suggest design calculations, factor and antenna type which is suitable for it?
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1
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0
answers
33
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Data for mapping a past flight?
Is there a website that shows past flight tracks of a few days back? tells how to use FlightAware to see a past flight on a map. But is there any public source of times/coordinates for past flights?
...
- 243
0
votes
2
answers
124
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What authority does the owner of an aircraft have as a passenger?
If Alice, who owns an aircraft and may or may not be a certificated pilot, flies in her plane as a passenger with her friend Bob as PIC, what authority, if any, does Alice have over the flight that an ...
- 6,564
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1
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39
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ILS Frequency Assignment In Dual Nav Radio Setup
With a dual Nav radio setup (On autopilot panel) does the ILS frequency of the runway you're about touch down on need to be entered into both radios or just one? Cheers.
3
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1
answer
303
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Did SR-71s have a switch for seat height adjustment for the pilot or were there strict height requirements in order to fly it?
I've realized that nowadays there are switches present on most modern aircraft which electrically adjust the height of the seating position, and I was wonder if that mechanism was present on the SR-71?...
- 115
2
votes
1
answer
139
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If I own land, can I create a private helicopter landing spot for my personal use?
If I own land(in the U.S.), can I create a private helicopter landing spot for my personal use? Would I have to register with the FAA or some other government agency?
3
votes
3
answers
1k
views
What is the effect of wind on altimeter reading?
I am wondering is there any effect from wind on the altimeter reading?
I think when the wind is blowing, the static pressure around the aircraft in flight will somehow change and this can impact the ...
- 109
5
votes
2
answers
357
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What is the heaviest Single Engine Prop Plane that has been flown?
What is the heaviest single engine propeller-driven fixed-wing aircraft that's been produced & actually flown?
Experimental and one-of-a-kind aircraft count, as long as it has actually flown.
The ...
- 49.8k
-1
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0
answers
42
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Design Airbrakes Area (or choose) for Sailplane
I'm trying evaluate what airbrakes shape (area) need a sailplane to flight into thermal in minimun sink or approach.
The main idea was to iterate adding drag with different flat plates (or more ...
- 113
7
votes
1
answer
2k
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How big would a single propeller need to be on a 737?
If you wanted a 737 to have the same design as a single prop light aircraft (i.e. just one prop on the nose, no turbines, APUs or other engines) - how big (and how fast) would the propeller have to be ...
- 12.5k
0
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1
answer
101
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Yawing during turns
This is a question about aeronautics. Does an airplane yaw while it is turning?
0
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1
answer
192
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Does the air in the region of pressure recovery over a wing decelerate in the vertical axis?
In this answer, it states that the deceleration of air in the region of pressure rise over a wing acts in a direction perpendicular to the lines of relative chord, explaining spanwise flow.
To be ...
- 435
3
votes
3
answers
662
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Minimum Sink Rate in Sailplane
How do gliders ascend (either with an engine or thermal) at best rate of climb if it is very close to stall? Or they move up by sacrificing that best Rate of Climb. In image the best CL^3/CD is ...
- 113
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2
answers
78
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What does the FAA define as an "Aeronautical feat"?
I got interested about 49 U.S.C. § 44724, which arose following the death of a 7-year-old pilot attempting to set a record. The new law says:
... the individual is attempting to set a record or ...
- 4,893
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1
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66
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Entry to back-side of power curve
When entering slow flight, when do we enter the back side of the power curve? Is it when we reduce the throttle or when the airspeed decreases to just above 5 knots from the stall speed?
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19
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3
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6k
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90 minute youth activity, what to do?
This is a bit of an open ended question.
Every year or so, one of the youth groups associated with local churches will want me to come and do some evening youth activity with them about aviation/...
- 693
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60
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What is 1950 Military Aircraft Blueprint to Aluminum Sheet Metal Process Called?
I have sections of vintage aluminum sheetmetal with aircraft 'blueprints' stenciled, what is this process called?
One plane is identified as a F9 Cougar (plane outline shown), others have earlier font ...
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1
answer
55
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Flying your own trips part 91 if your jet is on a part 135 certificate
If an individual owns a business jet and places it in an LLC, then in turn places it on a part 135 operator’s certificate, can that individual fly his own trips under part 91?
4
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1
answer
826
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What is ACS on a magneto switch?
I was looking at a magneto switch and the text ACS below attracted my attention. What is its meaning and function?
- 109
1
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1
answer
103
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How long can a foreign registry glider stay in the US before having to change the register to N or having to leave the country?
This is a qualification on a previous question, specifically for gliders.
Here is the link to the answer to the more generic question. Juan Jimenez thanks for the answer there.
As other sources ...
1
vote
0
answers
39
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Gulfstream IV-SP Not Sending POS INIT to IRS 3
After powering up and starting up EFIS/ICAS, starting up both FMS’s, I try to POS INIT the IRS’s, but the IRS in position 3 does not receive a position. It’s like it’s on and waiting for it, but it ...
- 11
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1
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36
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Are there any sources that contain information on the airfoils of the Boeing 737-500 and 737NG Aircraft?
I have found some information about this on airfoiltools.com (http://airfoiltools.com/airfoil/details?airfoil=b737a-il) but it doesn't specify the exact version of the aircraft, as the generations ...
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4
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1k
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Could the folding wingtips of a plane (ex. F-35C) be used as a vertical stabilizer?
In the rare event of the vertical stabilizers being ripped off and the rest of the plane surviving, could folding wingtips (given they are far enough behind the CoM to create a stabilizing moment) be ...
- 435
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2
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477
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Why does the nose pitch up during power reduction in a T-tail with rear mounted engines?
For the CRJ700 for example, reducing thrust causes a pitch up. Why is that?
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2
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1k
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How diesel fuel is injected into the cylinder of a diesel engine?
I am wondering how is diesel fuel injected into the cylinder of a diesel engine. Despite the difficulties of detonation, I think maybe a gradual injection of fuel during the power stroke will be ...
- 109
1
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0
answers
23
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Greek EASA part 66 basic license issue
Okay so I have been issued EASA part 66 B2 basic aircraft maintenance license by Hellenic Aviation that is Greece. Unfortunately it is not accepted by a lot many EU states. I am currently based out of ...
2
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0
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46
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Program to make glider polars
I was using flow5 to make some speed polars for a glider with real dimensions, however I read about PGEN (polar generation software) that could simulate the thermal effect, but apparently it is an ...
- 113
2
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2
answers
164
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Is the GPS ground track true or magnetic?
This question arises from the Garmin GPS units (eg. GNS530 or GTN750), but the term ground track appears in a general context of GPS units so my question is also general.
Is the ground track (TRK in ...
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0
answers
23
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What are the main changes in CAP437 rev 9 from a Helideck Monitoring perspective?
CAP437 rev 9 was first published Edition 9 February 2023. In particular, what should a Heliops operator conducting operations on a "moving" helideck be made aware of. What training would an ...
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11
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1
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677
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What is "Accident" on a VFR sectional?
Seen on the map just north of 2G4 (Garrett Country Airport) is a dot labeled "Accident".
(Direct link to map.)
I never noticed something like that before, and didn't fly close enough to ...
- 4,893
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0
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107
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Why does the F/A-18 use external aileron and flap hinges?
As seen in the picture, the legacy Hornet uses ailerons and flaps with external hinges, and I was wondering what were the advantages of external hinges compared to flush hinges in the land-based ...
- 11
2
votes
2
answers
459
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Different Engine/Prop Sizes on Same Wing/Single Craft?
On a four propeller/engine wing, I’m wondering if theoretically at least, you could have a larger engine near the root of the wing with smaller engine(s) further out on the span..?.. If you could have ...
- 21
2
votes
1
answer
172
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A transfer function relating jet engine thrust to pitch angle during a phugoid motion
Crossposted on Mathematics SE
I am doing a school project that requires me to find a transfer function that relates the thrust of a jet engine (which could change with time in one way or another) and ...
- 603
1
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0
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114
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Go Around After High Speed Landing [closed]
Is an aborted landing that was caused by the plane going too fast reportable. The plane touched down at a high speed then took off again.
- 11
1
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2
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169
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Is this "separation" caused by the boundary layer?
I was wondering if the void seen in this picture (on top of airfoil, not the wake from the airfoil) is from the boundary layer thickening, or from the fact that as you go further back on an airfoil, ...
- 435
3
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1
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385
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How can I determine the level of clouds of operational significance in METAR?
Considering that
Minimum sector altitude of the airport = 10500 feet
Airport elevation from MSL = 2500 feet
What is the level of clouds of operational significance in METAR for this airport? Should we ...
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0
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19
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How Low pressure moves across land [migrated]
I understand that low pressure systems ( like hurricane ) , can move across ocean since they are constantly fed by warm air from below .
But what is it that enables it to move across land ? Especially ...
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79
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Interference Fit load [closed]
How do you calculate Interference fit load using rigid body dynamics, an example would be really helpful.
I also know that we can set up analysis to find th same, but I am interested in finding the ...
- 19
0
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0
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35
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Finding airport charges information; landing, nav, pax etc [closed]
I've built a platform that passes a flight through a logic flow diagram to arrive at the correct cost. Sometimes it's very simple,
Sometimes it's more complex
Most of the time, here in the UK (and ...
- 135
2
votes
1
answer
114
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Does the pressure recovery on the rear side of an airfoil recover all of the pressure?
I was wondering if all of the low pressure created by the airfoil gets recovered on the rear side of the wing. (I know during a stall or flow separation, this doesn’t happen, I think)
My main question ...
- 435
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1
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186
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What is the history life of Cessna 172 airplane?
How can i find manufacture date of cessna 172P knowing serial number?
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2
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3
answers
481
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How do you find the center of gravity of an Anthropomorphic Test Device
In regards to the aircraft seat testing process in which the occupant's center of gravity is required, I am quite interested to know how people calculate the C.G. of an Anthropomorphic Test Device (...
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