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0
votes
1answer
22 views

What is effective airflow?

As I understood when relative airflow meets wing it changed and resulting flow is called effective airflow?
0
votes
0answers
24 views

What angle are front rotors of tandem helicopters tilted and why this value?

I've read that the front rotor of tandem helicopters are tilted forward so that you can get a forward velocity with no nose-down pitching of the fuselage, but what angle is used for this tilt and why ...
2
votes
1answer
33 views

Why would my transponder interfere with my ADF?

The ADF in my plane works very well until I switch the transponder to ALT. At that moment, the ADF needle is stuck in a random position and will not show the direction to the selected NDB anymore (the ...
-1
votes
0answers
41 views

If one cabin PA loudspeaker fails, do the rest get louder?

In an cabin intercommunication data system, if one loudspeaker fails do the rest get louder? Or does the volume stay the same without the failed speaker?
1
vote
1answer
45 views

Which instruments are assigned to Pilot Flying and Pilot Not Flying in the various flight stages?

Is there a document which highlights the responsibilities of the Pilot Flying and the Pilot Not Flying? Specifically, I want to find out what instruments are assigned to whom in all the stages of ...
5
votes
1answer
280 views

Is there a minimal approach speed for airliners during rush hour?

For busy airport, sequencing can be complexe. If the ATC put all aircraft in front of each other with the correct separation (which can be really small for busy airports) in final, if the airliners' ...
3
votes
2answers
66 views

What does “wraparound” mean in the context of flight controls?

In the references regarding the flight control (for example in F-16) I see the word "wraparound". For example "Rudder coil wraparound", "IBU pitch wraparound", "IBU lateral wraparound"or "AMUX bus ...
0
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0answers
48 views

Is the Mil Mi 2 still in production?

I have read conflicting reports that this Russian helicopter is out of production, yet others say otherwise. Could anyone confirm?
7
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0answers
49 views

Why does spoiler extension cause straight-wing Learjets to pitch down, rather than up, and why did it take so long to discover this?

Straight-wing Learjets (the 23, 24, 25, 35, and 36), the first generation of the popular business-jet series, are (especially when not equipped with any of the many first- and third-party wing ...
2
votes
1answer
78 views

Is there a minimal legal ground clearance to use an international airport?

The question arises while I was looking at the evolution of the B737 engines and the lower and lower space available between ground and engines. Then I realized that ground clearance is also low for ...
0
votes
1answer
68 views

How to match ATC requirements to work in EU?

My Brazilian boyfriend is finally planning to move into the EU zone (he actually got an Italian passport). He would be glad to keep his work as an Air Traffic Controller but despite his 10 years ...
3
votes
2answers
119 views

What is the explanation of this airfoil phenomenon? Why the air from below the leading edge's tip deflected up?

I have difficulties to understand this air phenomenon, why the air from below the leading edge's tip (from below the horizontal line) is deflected up and not just follow the bottom wing's surface? ...
4
votes
1answer
155 views

A commercial jet with rear tail-mounted engines and 3+3 seat pattern?

I have just spotted a cameo in one of the old CSI:NY episodes. External shot showed a commercial jet, rather big aircraft, with rear tail-mounted engines. While internal shots shown 3+3 seat rows ...
2
votes
1answer
125 views

Why Apollo 11 was launched in summer? (Performance question) [on hold]

The question could seems stupid, but i think that best moment to launch a rocket is when temperature is lowest in order to achieve the best performance in a reaction engine. I do not know if there is ...
2
votes
0answers
85 views

What role does this ground crew member fulfill?

At the Miramar airshow a couple of weeks ago I noticed that in addition to the crew chief of each Blue Angel there was one additional individual standing behind the crew chiefs between aircraft #3 and ...
0
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0answers
77 views

What replacement wings are available for old F-16's?

Eventually, material fatigue will force any aircraft to either be grounded or have its wings rebuilt, or replaced. And please, correct me if I'm wrong. For the F-16, if one were to replace its wings, ...
0
votes
2answers
155 views

What is the answer to this question about aircraft position based on an NDB?

An aircraft is intending to track from NDB ‘A’ to NDB ‘B’ on a track of 050° (T), heading 060° (T). If the RBI shows the relative bearing of ‘A’ to be 180° and the relative bearing of ‘B’ to be ...
0
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0answers
19 views

Is there a reason why it would be a good idea to log ATD and FTD time separately?

Historically, I have a column in my logbook that is "Ground trainer", which encompasses all flavors of flight simulators/legally recognized training devices. I encountered a student passed to me by ...
9
votes
2answers
685 views

Why are Krueger flaps called flaps and not slats?

I always thought that flaps are trailing edge high lift devices and slats are leading edge high lift devices. This is also confirmed by the accepted answer for What is the difference between flaps and ...
2
votes
1answer
101 views

Is the airspeed for the minimum the same for the theoretical power required curve as for the shaft power required curve?

I am aware that the efficiency of the propeller implies a difference in the values of the theoretical power required curve and the corresponding shaft power required, but does that efficiency ...
3
votes
2answers
116 views

How to artificially increase the Reynolds number in a wind tunnel?

I'm currently scaling down a model 64 times for a wind tunnel analysis, where I'm measuring drag force (for drag coefficient) and lift force (for lift coefficient). However, I read that scaling down ...
0
votes
0answers
37 views

What is the air/fuel mixture ratio in a turbojet engine?

How does it relates to stoichiometry ? What are the possible extinction accidents related to air/fuel mixture ratio ?
1
vote
2answers
122 views

Why did the DC-3 have a much higher cruise speed than the HP.42, despite their similar weight and power?

A review of the classic DC-3 and the Handley Page HP.42 yielded a surprisingly close match in empty and max gross take off weight at around 18,000 and 28,000 lbs for the HP.42 and 16,000 lbs and 25,...
1
vote
0answers
144 views

If an fighter jet that it have twin rudders, in use the angle of deployment it is not identical. Which is more deflected and why?

If an aircraft have two vertical tails then pilot push in the rudder pedal the rudders will not be deployed at the same angle.It is used throughout the all envelope of flight or is it possible only ...
3
votes
1answer
44 views

Under what circumstances is the Aircraft 'Stability-Axis' system used in either design or analysis of aircraft?

I understand the definition of aircraft 'Stability-Axis', but I am unsure as to the circumstances in which forces or moments would be expressed in this axis system. Is there a convention? What I do ...
-2
votes
1answer
132 views

Is the “Boom” project vaporware or really going to happen? [on hold]

Is this https://boomsupersonic.com viable or more vaporware? Any solid information?
1
vote
0answers
28 views

what is the physical explanation for additive drag?

from what i understand, additive drag is not really drag. it is a way to account for the variation of inlet condition due to conservation of mass. but i still don't get why it create drag(negative ...
4
votes
1answer
185 views

How do weapon pylons attach to a fighter's wings?

How do weapon pylons attach to a fighter's wings? I'm particularly interested in the inner structure.
1
vote
1answer
132 views

If you make up your own IFR waypoints, how does ATC know where they are?

If you make your own IFR waypoints, how does ATC know where they are? Just finished my IFR course in Canada. Was surprised to learn that you can make up your own IFR waypoints. If all IFR flights ...
4
votes
3answers
264 views

What is the difference between experimental and amateur built aircraft in the US?

What is the difference between experimental amateur and amateur built aircraft in the US, or are they the same? If not, is there a difference re specifications, inspections, engines, passengers, etc.?...
0
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0answers
108 views

“If it looks right, it flies right” Any examples of a beautiful plane which flew horrible? [on hold]

We find good-flying planes good-looking, mostly. Are there examples of beautiful planes which didn't fly well? EDIT:(Only technically, not if it didn't do well commercially). Well. Beside the ...
-1
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0answers
35 views

OnCondtion engines concept for PW5454B engines [on hold]

When we define the "On condition" concept to aircraft engines then do PW545B engine models come under this "On condition" concept?
0
votes
0answers
38 views

What is the relationship between ADS-B IN/OUT and different mode transponders?

What is the relationship between ADS-B IN/OUT system and different mode transponders? Can a aircraft with mode A or C transponder have the ADS-B in/out capability, that is getting more detailed ...
0
votes
1answer
66 views

Why do oblique-wing aircraft suffer from significant aerodynamic cross-coupling?

Oblique-winged aircraft (which have one long wing that pivots around a central point, so that the wing is straight at low speeds but strongly-swept - one side forwards, the other side back - at high ...
0
votes
1answer
47 views

How many tendencies are affected by Gyroscopic precession for single propeller airplane?

I have heard about LEFT turning tendency affected by gyroscopic precession of propeller (which is turning clockwise or counter clockwise if seen from front side). But I just watched a video on Youtube ...
15
votes
4answers
6k views

Is it allowed to let the engine of an aircraft idle without a pilot in the plane. (For both helicopters and aeroplanes)

Is it allowed to let the engine of an aircraft idle without a pilot in the plane. (For both helicopters and aircr). Would there be a difference between a C172 and a 737?
6
votes
2answers
102 views

In a helicopter does forward flight produce a rolling moment?

In forward flight the advancing blade will produce more lift than the retreating blade. It seems this would produce a rolling moment. If so, does the pilot have to move the cyclic to compensate for ...
-2
votes
0answers
70 views

Why don't the needles work on the VOR? [on hold]

The instrument has been bench checked ok and audio works but needles don't
34
votes
5answers
11k views

Why do military jets sometimes have elevators in a depressed position when parked?

Why do they have elevators in such a position as if the joystick is pushed forward, even though there's nobody inside the cockpit?
1
vote
0answers
58 views

Do most aircraft require a nose-up attitude for level flight? [duplicate]

I recently saw a picture of a HUD on a commercial plane, and I noticed the nose was level to the horizon but the flight path indicator is almost always under the horizon line no matter the speed, does ...
1
vote
2answers
124 views

A Twin made from two Cub J3s [on hold]

I plan to merge two Piper Cub models by shortening the port wing on one of them, and the starboard wing on the other. How much would I need to cut off to still have a similar climb out (using the ...
0
votes
0answers
82 views

In flat spin is rudder deflection used for recovery of the F16?

If the horizontal tails is used due MPO switch in recovery of the flat spin, is the rudder used for stopping the yaw of the F16 ? I know that for inverted flat spin is surely used, but I believe ...
0
votes
0answers
33 views

Wings and winglets [duplicate]

Wouldn't a wider wing center section be a better solution than adding winglets? Say adding 5% to the span by increasing the size of the wing box and center section. Like they did when they built that ...
1
vote
0answers
55 views

Is there any source or database from which we can find out the total number of military aircraft sold globally every year?

There are a few online databases that sheds light on the number of commercial jets that countries, airlines purchases every year. Is there any database that provides similar figures for military ...
0
votes
1answer
72 views

What requirements, standards or criteria are there for helicopters used in the oil and gas industry? [on hold]

I'm doing research about the best type of helicopters for the oil and gas industry. Is there any specific criteria for helicopters that the oil and gas industry usually looks for, like for example the ...
3
votes
1answer
128 views

What's the aisle width of long range business jet?

What's the average aisle width for long range business jet such as Gulfstream G500?
4
votes
1answer
206 views

Do wings on a plane need to be in the same plane horizontally, or can one wing root be 6" lower than the other?

Do wings on a plane need to be in the same plane horizontally, or can one wing root be 6" lower than the other? The proposed application would be for a ultralight with high mount folding wings, where ...
12
votes
4answers
6k views

How are Aircraft Noses Designed?

Look at the Learjet, Embraer and Boeing noses which are kinda pointy - drag efficiency aside, how do they come to the final design of the nose? I’m talking from an aesthetic point of view - how do ...
1
vote
1answer
77 views

What airfoils are used for the current generation of general aviation VTOL aircraft?

What airfoils are used for VTOL ultralights at 60-70 deg AOA without flaps or slats? An example of this would be the Blackfly with a takeoff distance of 3', about 25% of it's own length....!!!! I ...
0
votes
0answers
46 views

Old Jeppesen Charts - Where can I get specific airfields?

I'm interested in getting archived charts for historical comparison between databases. Is there a legitimate way to acquire specific airfield data from old Jepp' charts without purchasing an access ...

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