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.
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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
2
votes
1
answer
134
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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 ...
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?
- 31.6k
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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….
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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.
...
- 1,047
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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
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 ...
- 11.8k
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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.
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- 233
12
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4
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2k
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How does a helicopter rotor keep spinning in the same direction when autorotating without reversing the pitch
I have read that if helicopter's engine fails, you set the pitch to minimum but not reverse pitch. The rotor would have to be tilted back to provide an angle of attack on the blades so it glides like ...
- 313
3
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3
answers
1k
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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 ...
- 2,251
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 ...
- 229k
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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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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
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2
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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 ...
- 24.8k
5
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2
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3k
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How can I get flying again after FAA medical rejection for anxiety two years ago?
Post Military Service I was diagnosed with Generalized Anxiety Disorder and put on Zoloft (Sertraline). I had taken it for a while but had not refilled my prescription, and was off the meds with the ...
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1
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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.
- 49.8k
6
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2
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1k
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Are solar / geomagnetic storms real risks for commercial aviation?
Background
Solar storms/flares are solar events sending particles in space that are potentially dangerous on Earth. From Wikipedia:
Solar flares strongly influence the local space weather in the
...
- 1,802
3
votes
1
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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?...
- 100k
47
votes
4
answers
13k
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What is this aircraft with elaborate folding wings?
I noticed this plane in the background of this car advert. Can anyone identify it? I'm assuming that may have been used on an aircraft carrier, hence the elaborate folding wings?
- 70.9k
3
votes
4
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1k
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What causes lift?
Now this seems to be the question of the ages, and various questions on this site regards it.
The often told description of lift is that it is due to air traveling faster over the wing than under it, ...
- 229k
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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
30
votes
4
answers
17k
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Why shouldn't you inflate your life vest until you're outside the airplane?
On commercial flights, in part of the pre-flight safety demonstration, you're told in the event of a crash, not to inflate your life vest until you're outside the airplane — why is this?
- 2,099
7
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1
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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 ...
- 9,489
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1
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101
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Yawing during turns
This is a question about aeronautics. Does an airplane yaw while it is turning?
- 21.8k
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 ...
- 82.8k
4
votes
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?
- 514
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1
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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 ...
- 9,489
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1
answer
111
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Question about ILS approach categories
I was reading about FAAs ILS approach categories minimums and have a question!
Category II. DH 100 feet and RVR 1,200 feet (with autoland or HUD to touchdown and noted on authorization, RVR 1,000 feet)...
CommunityBot
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1
answer
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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 ...
- 12k
19
votes
3
answers
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/...
- 189
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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?
- 189
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2
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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 ...
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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 ...
- 7,568
1
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1
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255
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Is this method to calculate a biplane's center of gravity using 57% of the biplane's gap and 23% of each wing's MAC correct?
Once you have the MAC for both wings and the CG balance point as a percentage of the MAC. connect the two CG positions with a line. Measure up between the wing Gap distance and place your center of ...
CommunityBot
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0
answers
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?
- 24.8k
40
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11
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18k
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Why do new jet engines cost billions to design?
This question might come off as crude because it involves people's salaries, but I do not understand why new designs of large turbofans cost many billions of dollars to design. For example, the Pratt &...
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14
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2
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3k
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Why did the Boeing 787 switch back to separate IRS systems?
The Boeing 737 uses two independent IRS systems (see also Why are there two IRS switches on the 737NG?):
(source: 737 NG FCOMv2 (11.10.21 - Flight Management, Navigation - Controls and Indicators))
...
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3
votes
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?
- 3,157
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1
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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 ...
- 7,194
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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 ...
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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 ...
- 6,537
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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2
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674
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Can a certified mechanic ground my airplane?
The courtesy (under-wing) lighting and the rear seat overhead map light were on the same switch. I didn't like having the bright outside light on while my passenger read his magazine, so I separated ...
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3
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26k
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What is the difference between Assumed Temperature and Derate takeoff thrust?
Airlines like to avoid a full thrust takeoff as it increases the wear on the engine. There are two methods to achieve this: Assumed Temperature and Derate.
In the Assumed Temperature method, the ...
- 4,233
2
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2
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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 ...
- 21.8k
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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 ...
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