# All Questions

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0answers
50 views

### What AOA is to maintained in an inverted flight?

When an aircraft is inverted, what would be the angle of attack to maintain level flight?
2answers
141 views

### Reference area in lift coefficient calculation

Does the reference area changes with angle of attack? Most sources says it is projected area. If it is projected area then it should depend on Angle of attack. I want to calculate Lift and drag ...
2answers
427 views

### Why are there no high wing Canard airplanes?

Just had a thought about canard airplanes while looking at the Tu-144 that features a canard surface on the top of its fuselage. Are there any high-wing aircraft with a top or bottom mounted canard? ...
0answers
62 views

### How to research the sale prices of aircraft

I'm doing a little market research on aircraft I'm interested in purchasing, and I'd like to know what aircraft of similar type are selling for. I pulled FAA registration records on a handful, but ...
4answers
2k views

### Does this fuel leak from the carburetor of a C172E need immediate maintenance?

I'm concerned with a fuel leak I've developed on my C172E in the past 3 weeks and appears to be coming from the carb. There is even some fuel in the air breather near the bottom. A&P said its ...
2answers
1k views

### How can an ultralight be slowed down for landing in a tailwind?

When flying an ultra light and I have a tail wind, and, with the engine at idle how do I slow down to land ?
1answer
128 views

### What is the best way to move a touring motor glider over a wet grass surface?

In a flight club we operate an SF-25C (about 480kg empty). In fall and winter the surface (grass) of our taxiways often gets to wet so if we would move the aircraft we would damage the field and we ...
0answers
17 views

### Are MPD tasks with FEC 6 or 9 mandatory to be included in the maintenance programme? Can they be ignored?

As per the title. FEC 6 or 9 is classified as non safety related. Can those tasks be excluded from the maintenance programme?
1answer
124 views

### What is the "mass growth factor" of an aircraft?

How to understand the aircraft mass growth factor? Which physical meaning does it hide? Which are the practical applications?
2answers
2k views

### By aircraft design, excluding engine power, how do you make planes that have a tight turn radius while maintaining speed?

What are all factors in design, excluding engine power and acceleration, thrust vectoring and flight computers, that makes a plane that have a real tight turning radius while maintaining speed? Like ...
1answer
2k views

### What are these paint patches on this 787-8?

What are these paint patches on this British Airways 787-8 (G-ZBJB)?
1answer
171 views

### Why did the NTSB issue a full report for this accident?

The NTSB issued a full aircraft accident report https://libraryonline.erau.edu/online-full-text/ntsb/aircraft-accident-reports/AAR73-10.pdf for what seems to me to be a small general aviation crash. ...
0answers
47 views

### Why are C17's horizontal stabilizer mounted so high? [duplicate]

The C17 has its horizontal stabilizer mounted at the top of the vertical stabilizer, way above the plane of the wing but most aircraft, including other large aircraft made by the same manufacturer (...
6answers
1k views

### Can induced drag be negative?

For an aircraft in straight and level flight, lift-induced drag is the horizontal component of the force perpendicular to the wing chord. Positively cambered aerofoils generate lift starting at small ...
0answers
127 views

### What rules exist that state what a competent authority do with a runaway drone?

In this AAIB accident investigation, published in 2021, a rather terrifying event is described in which a 3m long, 95 kg remote-control nearly-home-built drone is flown at speeds of up to 25 m/s below ...
2answers
102 views

### Is there much point to getting a sport pilot license if you don't intend to buy a Light Sport Aircraft? [closed]

It seems difficult, if not impossible to rent a Light Sport Aircraft, hence my question. Unless you had a friend with an LSA it wouldn't be much use to hold that license, would it?
0answers
89 views

### Assuming you could program a drone to fly around the world, how could you upload pictures to the internet when so far up and out overseas? [closed]

I see people post pictures of their planes flying and most are Remote controlled. What if you made an autonomous plane that could fly around the world (let's forget about international legalities for ...
0answers
65 views

### In terms of aerodynamics, what is a polar?

Many aerodynamics discussions (including several on this site) talk about "polars" without ever explaining what they actually are. As with any technical term common to a field, once the ...
4answers
426 views

### Viable to slip onto the center line?

One of the constant problems of aviation is drawing onto the center line on final. Either due to a bad rollout or due to crosswinds a pilot often finds that the aircraft is not on the center line for ...
0answers
69 views

### Why do fractional programs seem to have so few hours?

Fractional ownership programs I have seen often seem to have a relatively small hour allotment. For example, a typical arrangement might be a 16 way ownership with 50 hours each. So that is a total of ...
1answer
91 views

### Is temperature inversion good or bad?

When there is temperature inversion, I heard that convection is suppressed and hence the layer of air is stable. But I also see the following questions when studying for my PAR: A pilot can expect a ...
0answers
29 views

### What are the Responsibilities of Aerodrome Standards Division in this picture below?

Hi guys, What are the Responsibilities of Aerodrome Standards Division, most of manuals from ICAO talks about DASS and I know Aerodrome Standards Division focus on Planning and Design but are there ...
1answer
68 views

### VFR through Class C to land at Class D (located within Class C)

Student pilot (US) here prepping for long solo XC. I'll be landing at a Class D airport (KSCH) within Class C airspace (KALB). I have a few questions regarding procedure and what is appropriate for ...
1answer
68 views

### Log dual flight time and certificates which have been revoked due to enforcement action

As with the case of Martha Lunken, who had all of her pilot certificates and ratings revoked for dammed fool stunt where she intentionally flew under a bridge, The FAA does allow people to reapply for ...
1answer
74 views

### Questions about items on Jepp charts…

On a Jeppesen IFR low enroute chart, there's occasionally a different altitude below/next to the MEA with a "T" next to it. (For example: V16 between GACEB and SHAKY, there's a "2900T&...
2answers
161 views

### Lost Logbook, but have all flight information on ZuluLog

Good afternoon everyone. Back in 2013 / 2014 I did Part 61 training in WA State. I had to stop due to financial difficulties at that time. I moved to Phoenix 6 years ago, and now that I want to get ...
1answer
92 views

### What is a "polar front low" and what is its usual direction of movement?

As part of my learning to the meteorology exam for PPL I seen the following question - "What is the usual direction of movement of a polar front low?" the answer is - "Parallel to the ...
2answers
163 views

### What is a "fixed wing" aircraft?

I’ve been trying out different hobbies over the last year, and plane spotting is my current one. I’ve heard some terms being thrown around about planes like the ones at the Airport - what is a Fixed ...
0answers
71 views

### PPL H - Previously logged hours from the past towards CAA and EASA after Brexit

I have 50+ student hours in rotorcraft from about 8 years ago in the UK under the CAA. I am now looking to restart training in Europe for a dual EASA and CAA license. I've been told that because my ...
1answer
121 views

### Are Airbus A320 Cabin Door Exterior & Interior Levers Linked?

Was looking at this video on Airbus A320 Cabin door procedures and was wondering if the exterior door lever is mechanically linked to the interior lever? It seems as if the exterior lever will open ...
1answer
66 views

### Can I (FAA CPL / Korea CFI holder) log instructor time in the US?

I am a CFI in Korea, and I have FAA CPL. Can I log my logbook as instructor time? (FAR 61.41)
0answers
34 views

### What is the relationship between AoA and shock wave position in the transonic regime?

I am sure this is a simple relationship whereby as the AoA increase the shock wave moves forward along the upper surface of the aerofoil however I am struggling to find any studies to validate this, ...
1answer
70 views

### Is there a classification/group for UAVs with certain specs?

Is there a classification (like a name for UAVs that have max cruise velocity of 350km/hr) for UAVs please? So based on specs like range, velocity and altitude for example? Thanks, any resources with ...
1answer
198 views

### What is SVC CTC on a chart supplement?

The chart supplement for KSNA mentions the following AIRSPACE: CLASS C svc ctc APP CON svc 1415–0700Z‡ other times CLASS G. I know that SVC means service. I've gathered that KSNA is class C from ...
1answer
177 views

### Is Flight Service Station the same as En Route Flight Advisory Service?

As title suggests, is "Flight Service Station" the same as "En Route Flight Advisory Service?" In regards to VFR, I was told that if I get lost in flight and general lost ...
1answer
136 views

### How do I calculate the correct rotation speed for a given density altitude?

The Airlines calculate the rotation speed of every takeoff based off the weight given to them from their operations people and also the density altitude conditions. In General Aviation we don't ...
0answers
85 views

### Could anyone provide me with the performance charts for Boeing KC-135R Stratotanker?

I am looking for the Long Range Cruise Maximum Operating Altitude performance against the weight of the plane, all engines operating. Would be grateful if someone could point me the way.
1answer
107 views

### What is the name of the unequal lift distribution across a helicopter rotor blade?

A helicopter rotor blade will generate more lift at the fast-moving tip than at the slow-moving root, unless it is twisted or tapered. Wikipedia calls this "asymmetry of lift", however I ...
0answers
93 views

### How to estimate the time to intercept for homing missiles?

I have been reading the book Tactical and Strategic Missile Guidance by Zarchan, and a notice that he frequently uses the time to intercept $t_{go}$, and in his simulations he fixes the final time. My ...
0answers
94 views

### How to choose engine type for a MALE Unmanned aerial system?

I want to choose an engine type for a Medium-Altitude, Long-Endurance (MALE) drone which should survey permanently an area (500km*500km) located 800km from departure base. Given the following ...
1answer
40 views

### Can I do QAR files readouts locally? [closed]

I have access to Quick Access Recorder files (.dat, .rec binary files) from the Flight data recorder. I would like to make the readout locally if possible. There was an interesting question What is ...
1answer
88 views

### If I put two ductfans behind one another, would I got the sum of the rated thrust or other thrust values?

I am trying to design a VTOL system for a drone and I don't want to have extending motor arms that make it look like a quadcopter. I want to use duct fans and thrust vectoring nozzles. However, the ...
0answers
40 views

### Is the y+ value still meaningful for aerofoil in transonic flow? [closed]

I am trying to assess the validity of the results of an aerofoil in the transonic regime using CFD methods. I am wondering however, due to the presence of shock waves does this mean that the y+ ...
1answer
965 views

### How are control surface problems in wings having high bending dealt with?

In some aircraft which have large wing deflection due to bending, do ailerons or flaps not get stuck or bent themselves? In the case where hinging axis is also bent how do ailerons operate?
2answers
167 views

### Is V best endurance configuration the best way to save a heavily overloaded aircraft?

After reading this, we all agree "the experienced pilot takes over, lowers the nose, and the plane is saved". Not bad advice, but what speed offers the greatest amount of excess thrust ...
0answers
48 views

### Maneuvering Speed Discrepancy

In this page from the limitations section of the Extra Flugzeugbau 330SC, it states I’m curious as to the discrepancy between maneuvering speeds Va between operation in the Normal Category and the ...
1answer
539 views

### Is the pressure change due to volcanic activity a concern?

The recent eruption of the Hunga Tonga–Hunga Ha'apai sent a shockwave so massive that it got picked all over the world by weather stations. This is the pressure detected one in Italy (source), where ...
3answers
7k views

### Why is this plane struggling to gain altitude?

Here in this video, you can see an airplane trying hard to gain altitude (happens at 1 min 17 secs, original video): Plane Gets Struck By Lightning I am skeptical. Does it actually happen, or is the ...
1answer
121 views

### which is better for stability between the delta and rectangular wing designs? [closed]

building a minuscule version of an airplane and need to know between delta and rectangular designs which would be better. I don't need any other designs, just delta and rectangular. Tailless. Which ...
0answers
130 views

### Before certified GPS, how much did a full IFR panel cost?

Certified IFR GPS navigators are expensive, but the price of even used HSIs and DME seem to bring some perspective to that cost. How much did a full IFR upgrade cost back in the day before GPS?

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