All Questions

Filter by
Sorted by
Tagged with
-9
votes
1answer
159 views

What programming language(s) is Boeing's MCAS written in? [closed]

What language is Boeing's MCAS written in? Thanks
6
votes
2answers
398 views

How did pilots maintain the Vomit Comet's parabolic trajectory?

How did the Vomit Comet maintain its free-fall trajectory? Careful trimming? Custom autopilot software? Or just good stick and rudder technique? Wikipedia, citing references but without ...
1
vote
3answers
163 views

Wing vs wall to wall wing,total drag comparation at same AoA?

Compare total drag of wall to wall wing vs wing(open tips) in wind tunnel,AT SAME AoA. My first intuition is that wall to wall wing has higher pressure drag at outward parts of wing,because side-walls ...
3
votes
2answers
48 views

What do we mean by taking the lowest of ZFW; TOW and LW to determine the maximum takeoff weight of the day?

Firstly, I understand that the maximum permissible takeoff weight can be limited by landing weight because landing weight plus trip fuel gives us one take off weight. We obviously do not want to be ...
9
votes
2answers
2k views

What radial is the aircraft crossing?

I'm working through the ASA Private Pilot 2020 Test Prep questions and there's a question I don't understand the answer for. 3579 (Refer to Figure 28, illustration 5) The VOR receiver has the ...
5
votes
1answer
2k views

Why will the 777X be tested for crosswind handling with wingtips raised?

Wikipedia says: As existing regulations do not cover the folding wingtips, the FAA issued special conditions, including proving their load-carrying limits, demonstrating their handling qualities in a ...
2
votes
2answers
152 views

Is it legal to fly without a transponder?

Everything is legal / airworthy. Except: Transponder is installed. It does work. It has NOT been inspected in any time frame that would show it is properly maintained. Flight is Golf, Echo, Delta &...
2
votes
3answers
191 views

Could gliders be a clean, practical alternative to other forms of transport?

Would it be possible to use pure gliders as an eco-friendly mode of transport? From what I have read so far, gliders can travel at a speed of 100-170 km/h. That would not be able to compete with a jet ...
5
votes
2answers
78 views

What RNP level is required for an RNP approach if the chart does not specify a value?

RNP (Required Navigational Performance) approaches require the aircraft to monitor the navigation accuracy within a specified limit, called RNP level: There are several different levels of RNP. ...
0
votes
2answers
184 views

What could I do to a give a plane an emergency boost of power for takeoff?

For some reason the pilot has to take off in an emergency or is on a runway too short or maybe they just want more places they can land and takeoff. The single engine plane is already light on fuel ...
-3
votes
2answers
108 views

Can I check my density altitude with my brakes?

The same way one would apply the brake and accelerator, the more torque the more break is needed to hold the car, can a plane use this same technique to check the plane thrust and air density before ...
15
votes
5answers
5k views

How do missiles steer (mainly air to surface)?

How do missiles steer in the air? What techniques do they use?
-4
votes
3answers
187 views

Would this quadrilateral-shaped airfoil produce lift with a zero angle of attack?

I have been recently studying the shapes and characteristics of different high-lift airfoils that have been used for VTOL aircrafts. While studying these different designs today, a particular ...
1
vote
3answers
176 views

Has anyone built an aircraft with a flat ring wing?

When I try to search for circular wing aircraft, everything I find has the wing loop up over the top of the craft. What I want to see, however, is basically an Aerobie Flying Ring, but with a ...
2
votes
2answers
80 views

Does dihedral improve roll stability in gusty conditions?

Against roll instability, should I add more dihedral/a high wing? I'm trying to build an RC plane that can handle windy conditions. For that I want extraordinary aerodynamic stability. For ...
0
votes
3answers
151 views

How do I know which airports have ILS and for which runways?

I have been into flying for years but something I can't figure out is how do I, as a pilot, know if an airport I am going to has ILS, which runways would have it and why do only some have it but the ...
3
votes
0answers
103 views

I have a PPL in Australia and own a plane. I am wondering if I am legally allowed to hire my plane out to other pilots and make money?

I have found multiple answers that state I can lease to a school and things like that but I need to know if I can hire my plane out privately to other pilots (I.e mates) And actually make a profit ...
6
votes
2answers
798 views

Diamond DA42 - Do you need the electric master on to extend landing gear?

For the Diamond DA42 (TDI) Learning my electric fire emergencies. Would it be wise to extend the landing gear before electric master is turned off? Does the (hydraulic) gear power pack require the ...
33
votes
2answers
3k views

Starting on the left magneto only - why?

I had been flying a PA-28 Archer III for quite a few months before I sat down to properly read through the POH. Something stood out to me about the starting procedure (emphasis mine) Open the ...
2
votes
2answers
115 views

Simple explanation for static and dynamic pressure?

From what I understand, static pressure is just the pressure of still air and acts perpendicular to the airflow and surface. An airplane will feel static pressure regardless of whether it is moving or ...
2
votes
2answers
122 views

What forward airspeed produces maximum rate-of-climb in helicopters?

Lift in a helicopter increases with airspeed (from zero IAS up to some Vmax). But in contrast to fixed-wing aircraft a helicopter can generate lift at zero airspeed. Is there a formula for the ...
3
votes
2answers
130 views

How to distinguish the induced drag of a lift-producing wing from its pressure drag?

Quote John Anderson Fundamentals of Aerodynamics: "The three-dimensional flow simply alters the pressure distribution on the finite wingin such a fashion that a net pressure imbalance exists in the ...
13
votes
1answer
1k views

Why are true headings followed above 73N in the northern hemisphere, whereas in the southern hemisphere the change is made at 60S?

The question is in regards to the asymmetry of the changeover latitudes and NOT about why it needs to be changed.
1
vote
0answers
63 views

What medications for depression are approved by the FAA? [duplicate]

I understand that there may be additional medications on the approval list.
8
votes
3answers
2k views

If I buy my own aircraft in which to earn my PPL, does my instructor need to be certified to fly the type of aircraft I own/am training in?

It seems the most cost-effective way to earn my PPL is to purchase my own plane (with the intention to keep it for quite some time). I believe I would therefore need to find a CFI that is certified ...
-2
votes
1answer
143 views

What is this aircraft doing?

I spotted this aircraft on FlightRadar24 flying a strange route. What is it doing?
2
votes
1answer
130 views

Does anyone know more about the 1958 Heinkel-211 project?

Industria Aeronáutica Argentina worked in the 50s in a Jet airliner, Kurt Tank design, the IA-36, 'Cóndor', with simmilarities to 1958 Heinkel-211 project, turbines intake aspirating fuselage boundary ...
0
votes
1answer
125 views

Does ducted fan require more engine torque than unducted-fan,at same RPM?

Two identical fans, one is unducted and other is ducted,both operate at same RPM. •Does ducted fan require more engine torque than unducted-fan ,measured both at same fan RPM? power=torque x RPM so ...
2
votes
1answer
37 views

Is there an official English version of LTF-UL?

I have found the German version of the ultralight regulations under Germany airworthiness authority, but I have not found a link for English version of that. is there any?
1
vote
0answers
67 views

Does skin friction change with AoA?

Does skin friction change with AoA or stay constant during change in angle of attack? I think that local airflow velocity change with AoA so this must affect skin friction .. But what definiton tells?
1
vote
1answer
52 views

Does total aerodynamic force include skin friction/shear streses contribution?

Does total aerodynamic force by definition include skin friction/shear streses contribution or this only represent overall intergration of static pressure(normal to surface) around wing/airfoil?
0
votes
3answers
355 views

What is the reason Light Sport Aircraft (LSA) minimum speed is limited? [closed]

I saw an explanation about Icon A5 Light Sport Airplane (LSA), it is said that according to FAA regulation, its stall speed NOT LESS than 45 miles per hour (mph) or around 39.1 knots or around 72 km ...
2
votes
0answers
74 views

KSEE LOC-D conundrum

Consider the LOC-D at KSEE and note the Alternate Minimums criteria. 99.9% of the time, the winds strongly favor 27R; The tower closes at 1900 PT currently (usually at 2100 PT non COVID times); LOC-D ...
4
votes
1answer
77 views

Why this inertial regulator of dragonfly wing pitch reduces self-excited coupled flapping and feathering vibrations and improves gliding flight speed

The pterostigma of insect wings an inertial regulator of wing pitch is linked in this answer to Why do dragonflies have these special little spots on their wings? (open access copy here) The Summary ...
1
vote
1answer
78 views

Is it possible to give an endorsement via text message or email?

Is it possible to give an endorsement to student pilot via email or text message? For example, I gave an endorsement to my student for a XC. However, he stuck at the destination airport after the ...
2
votes
3answers
138 views

Are there any GA trainer aircraft without toe brakes?

I'm a student pilot, and I've built about 20 hours on a Cessna 172. I also have an old ankle injury that makes it hard to bend my left ankle, and I'll probably be getting an ankle fusion later this ...
2
votes
1answer
350 views

Can a non-IFR rated pilot accept an IFR clearance, provided the operation occurs in VMC only?

According to this FAA ruling a pilot can operate an aircraft under an IFR flight plan even if the aircraft is not IFR certified, provided the operation occurs in VMC. What the ruling doesn't ...
0
votes
0answers
21 views

In actuator disk theory, why does changing the inertial reference frame work for Bernoulli's equation?

I was reading this website: https://web.mit.edu/16.unified/www/FALL/thermodynamics/notes/node86.html, which goes over actuator disk theory, and it discusses using Bernoulli's equation in a frame of ...
2
votes
0answers
39 views

Why are holding patterns clockwise by default? [duplicate]

PANS-OPS (Doc 8168), Procedures for Air Navigation Services, volume 2, section 4, chapter 1: "If no operational considerations prevail, right turns holding patterns should be established." ...
2
votes
1answer
85 views

Garmin 530: What is NXRG telling me?

I have a Garmin 530 in a Cessna 550. It has a constant display of NXRG:x:xx in the upper right corner of a map page. It changes color (yellow and green are common) ...
1
vote
1answer
136 views

What is the problem if the temperature of the oil and heads of cylinders is too high?

What is the problem if the temperature of the oil and heads of cylinders is too high? What's the fault in piston engines?
0
votes
1answer
116 views

Is designing a small GA airplane with a wing loading of 20-25 lbs/sq ft a bad idea, or is that wing loading too high? [duplicate]

Is designing a small GA plane like the following a bad idea? This question is not the same asking if a an airplane with a traditional design is safer with a lower wing loading. This question ...
1
vote
1answer
96 views

Can I measure induced drag with a simple wind tunnel test?

Device can measures total drag force and lift of wing for given AoA and airflow speed. Wing both wingtips are far away from side walls. Airflow speed is constant all the time:50m/s TOTAL DRAG=...
-1
votes
0answers
24 views

How do you ask a specific user a question about a previous question they asked [migrated]

A user on here asked a question and in it he provided some insight as to what he was creating. What he was creating is very similar to what I am trying to figure out. How do I ask him about this in ...
0
votes
1answer
36 views

Why is tangential velocity a loss of kinetic energy in a turbine section?

While researching turbine engines I came across a statement The mass of airflow naturally does not change in the transfer of energy to the rotor system, but the velocity of mass flow being slowed ...
0
votes
1answer
79 views

Why do most authors use wingtips vortices as reason for 3D flow around wing?

Quote John Anderson Fundamentals of Aerodynamics: The three-dimensional flow induced by the wing-tip vortices shown in Figures 5.4 and 5.5 simply alters the pressure distribution on the finite wingin ...
1
vote
3answers
158 views

Pros and cons of a thin cambered wing?

What are the pros and cons of a thin cambered wing? Does a thin cambered wing suffer from a flow separation bubble on the lower side, at cruising speed/low AoA? Very roundy leading edge, can air ...
0
votes
1answer
73 views

Why is the ILS16 approach at KSKF not available in my Garmin 430W?

I am doing flight instruction on the San Antonio area (Texas) and I've been shooting different approches on the vecinity airports. One of the approaches I usually execute is the ILS 16 at KSKF, which ...
0
votes
1answer
56 views

How to calculate the radius of a turn as a function of speed, bank, wing-loading, and Cl?

Although the question of how to calculate the radius of a turn of an aircraft has been answered before using only the speed and the bank angle, the reality is that 2 aircraft with the same speed and ...
-4
votes
2answers
102 views

What happen if the glide slope beacon removed for maintenance? [closed]

it about aircraft navigation system (ILS), when the aircraft about to landing but unfortunately the glideslope beacon being removed.

15 30 50 per page