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29 views

Trouble with Valveless PulseJet

My friend and I are working on building a valveless pulsejet out of sheet metal. We initially built a small one (a few feet in length) using the below dimensions: The issue was that we were unable to ...
2
votes
1answer
56 views

How is take-off power defined?

In a recent post it could be read that by definition, turbofans do not produce power in the static case (at velocity zero). The statement could be a bit confusing since turbofans and propeller engines ...
1
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1answer
31 views

Difference between fuel control unit and fuel flow meter (transmitter)?

Hello can someone explain the difference between the fcu and fuel flow transmitter and how they work together alongside the fuel pump?
-6
votes
2answers
156 views

Would building an airport at 30,000 ft save money? [on hold]

So... this would obviously cost a ton of money initially, but long-term, I believe the savings both environmentally and financially would be returned many times over. If a building can already be ...
4
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0answers
126 views

What is Snowbird flapping mechanism?

Reading this question and the great answer to it talking about Snowbird sustained human powered flight visible here, I was wondering and still cannot find nor figure out how power is converted from ...
2
votes
2answers
202 views

Are exoskeleton wings technically possible?

While there have been a robot simulating a bird, could be there also an exoskeleton wing system for a human? Main design considerations: a) only human powered b) using an additional, or exclusive ...
0
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1answer
50 views

What is the definition of “blade scatter” in gas turbine compressor dynamic balancing?

Can someone help me define “blade scatter” gas turbine compressor dynamic balancing?
5
votes
1answer
166 views

Are there any plans to make the QF-16 into a drone for actual combat missions, or a fully autonomous fighter?

It appears to a naive layman like myself that the QF-16 is an excellent platform to use for remote controlled missions akin to that of other drones. Except that the F-16 appears to have a broader ...
2
votes
1answer
79 views

Do you need to fill out the MedXPress form every time you renew your medical?

In the US, to get a 3rd-class medical certificate I know that you have to fill out this form on the FAA's website, get a confirmation number, then take that confirmation number to the medical examiner....
25
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3answers
7k views

Why can't an Airbus A330 dump fuel in an emergency?

It was reported recently that the Swiss flight LX18 from Zurich to New York had detected an engine issue shortly after take-off and decided to land back in Zurich. Apparently, the Airbus A330-343 ...
8
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1answer
402 views

What's that rattling noise from parked jets? [duplicate]

While walking around the airport on a windy day I occasionally hear a tingling or rattling noise from the engines of the parked jets. You can see the fans rotating in the breeze. What’s causing the ...
4
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0answers
109 views

Why do they tell you to tie your lifevest on the left side during safety briefings?

This might be UK specific, given I have only been flying internally recently. During the safety briefings, when describing how to inflate the lifevest the instructions are always: "Wrap the lines ...
2
votes
1answer
41 views

What is the drag optimized wing form for given lift and bending moment?

I am trying to build a passive hydrofoil board. Something like this: I want to use wood and i am coming to the conclusion that i want to optimize drag for a given ...
0
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0answers
67 views

“Snowglobe”-type attitude indicator [duplicate]

I'm an aviation enthusiast (I do not, nor have I ever worked in the industry), and after researching several various emergencies (reading text documents, reviewing CVR transcripts and watching ...
8
votes
2answers
490 views

Are thrust levers synchronized by default when pushed/pulled? [duplicate]

When I watched this video about the last flight of Juergen "J.R." Raps from SFO to FRA in an A380 (before his retirement) I noticed he lines up or synchronizes the four thrust levers as shown between ...
3
votes
1answer
169 views

Is an F-16 able to fire any of its weapons while on the ground? [duplicate]

I can recall at least one Hollywood movie, where this takes place (although not an F-16 in the movie). Is this at all possible? Can the F-16 fire its M61 while taxiing on the ground? What about other ...
35
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2answers
7k views

Can you feel passing through the sound barrier in an F-16?

Is it possible for the pilot to feel passing through the sound barrier in an F-16? What about other modern aircraft, will you feel anything? Do you need to go back to really dated designs before you ...
4
votes
2answers
115 views

What are advantages and disadvantages of flaperons?

What are some advantages and disadvantages of flaperons? Do they cause some issues or are they top-notch reliable?
1
vote
1answer
100 views

What is the difference between autopilot and autoflight?

Can you please give me some explanations about autopilot and autoflight system?
1
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0answers
68 views

Where can I place an engine in a twist morphing wing?

I am designing an electric aircraft with a wing that is completely based on the idea of biomimicry, whereas the wing has multiple winglets and can also morph by twisting. It is more like an experiment ...
2
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0answers
60 views

How did the Caproni Ca.60 electrical communication system work?

On the wikipedia page for the Ca.60 it says: The two nacelles also housed a cockpit for one flight engineer each, who controlled the power output of the engines in response to the orders given by ...
1
vote
2answers
76 views

Shouldn't the upwash on an airfoil increase the effective angle of attack?

From what I understand, induced drag comes from a reduction of the effective angle seen by the airfoil. However, from wind tunnel smoke visualization, we can see that the streamlines at the leading ...
1
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0answers
35 views

KJAC VORDME Rwy 19 Initial Approach Fix

See the attached KJAC VOR/DME Rwy 19 approach. QUESTION: Why is the JAC VOR an IAF for this approach? There isn't a procedure turn to use this VOR as a functional IAF, and the twin peaks (13,770' ...
2
votes
1answer
215 views

What DAL are Humans?

I am no expert at the Development Assurance Process, but hypothetically speaking what Design Assurance Level (DAL) would a human pilot receive if they were classified as one (i.e. DAL A, B, C, D, E). ...
1
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1answer
92 views

What date and time definition is used for the second leg of a flight?

Let's take flight BA0015, from London to Syndney, via Singapore. This is data from FlightStats. The first leg has this data: ...
0
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0answers
95 views

Has automatic all-seat reclining been tested?

Seat reclining in modern economy-class seats is a problem when person in front of you reclines, but you are still in vertical position. Has there been a consideration of simultaneous reclining of all ...
2
votes
1answer
134 views

What are the maximum possible stabilizer and elevator deflections for the A320?

For research purposes I would like to know the maximum deflection angles (in both positive and negative direction) of the A320-200's stabilizer and elevator. I am trying to analyse what flight ...
5
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0answers
83 views

When were checkerboard fiducial markers first used in aircraft development?

It's common to put checkerboard fiducial markers on aircraft to help analyze rates and orientations from photographs and film. When was this practice first used on aircraft? Flight test versions ...
18
votes
4answers
3k views

How does turbine efficiency compare with internal combustion engines if all the turbine power is converted to mechanical energy?

It is widely know that early turbojets guzzled fuel and created thrust simply by spewing accelerated matter out the back. Modern jets have come a long way in earning a better reputation with ...
0
votes
1answer
113 views

Do Airbus avionics give good deadstick landing outcomes? [on hold]

We have recently had a second good outcome, in Russia, of a no power landing of an Airbus aircraft. The first was the "miracle on the Hudson". It appears to me that the avionics of this aircraft are ...
0
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0answers
65 views

How do you design a NACA intake?

What are the construction guidelines to geometrically build a NACA intake (submerged intake) for aircrafts? The relationships between the aerodynamic performance parameters (ram recovery, drag, and ...
2
votes
0answers
37 views

Are speed limits used for departure turns imposed also on the rest of the procedure?

ICAO's PANS-OPS manual 8168 ("Aircraft Operations") defines turing departures as described below: 2.4 Turning Departures. When a departure route requires a turn of more than 15°, it is called a ...
7
votes
2answers
2k views

Did the twin engined Lazair ultralight have a throttle for each engine?

Did the twin engined Lazair ultralight have a throttle for each engine? I know larger aircraft have dual throttles. What about the smaller aircraft like ultralights? It would be so much easier just ...
4
votes
0answers
218 views

What is the highest indicated airspeed ever achieved in a traditional aircraft?

It is fairly well known that the SR-71 holds the record for highest speed for a traditional aircraft (not a rocket/able to land and takeoff under its own power). However since the SR-71 flies much ...
7
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3answers
1k views

How do slats reduce stall speed?

I've read in PHAK that slats reduce stall speed, but in what way? Is it because of the increase in surface area?
-3
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0answers
96 views

What would happen if you were to chain a helicopter down by the landing gear (or hard point on fuselage) and turn the throttle up? [on hold]

What would happen if you were to chain a helicopter down by the landing gear or fuselage and turn the throttle up? Would the effect be drastically different for larger or military vs civilian ...
2
votes
1answer
212 views

Are there different sub-types of a mayday call and do pilots use them when declaring emergencies?

I was reading this pilot's quote from the Northwest Airlines Flight 85 incident: "This was a classic application of CRM. We were blessed and lucky that we had full flight crew augmentation. We ...
4
votes
2answers
94 views

What sort of sensors are used for sensing the positions of the control surfaces for the ECAM F/CTL page on Airbus aircraft?

During the pre-flight flight-controls-check how does the ECAM F/CTL page report on the actual positions of the control surfaces? What sort of sensors are these? Is it a proximity sensor? This is ...
2
votes
2answers
170 views

Can military officers change occupation to become pilots?

From what I have read, the paths to become a fixed-wing pilot in the Air Force, Navy, and Marines, are to go to a military academy, enroll in ROTC in college, or go to an officer training school after ...
11
votes
2answers
2k views

Could sidesticks be linked?

A sidestick is spring-loaded to the centre position. If there were servos under the stick, connected to the other side stick, so instead of being spring-loaded to centre, it was spring-loaded to the ...
4
votes
2answers
93 views

What is the function of cross bracing of interplane strut?

Pic 1 is the top and lower wing of a biplane called Bloop Ultralight,what is the function of the cross bracing between the interplane struts as seen in pic 1(I'm not talking about landing and flying ...
18
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1answer
4k views

Are there any legal requirements concerning airline pilots and their watches?

Are there any legal requirements concerning airline pilots and their watches? Do they have to be of any particular kind and are pilots required to wear one at all?
5
votes
1answer
3k views

What are these protruding elements from SU-27's tail?

I recently saw in person SU-27 belonging to the Ukrainian Air Force. I spotted some protruding elements from its tail and I'm wondering what are they called and what do they do?
3
votes
1answer
104 views

With an EASA PPL, can I invoice my mother's company for airplane rental to fly her to a convention, with no other renumeration?

My mother who owns a private company asked me if I could fly her to a convention. She asked if it was possible if the costs of the plane rental could be invoiced to her company. Since I only posses a ...
2
votes
1answer
66 views

How can I get 'lead point' for aircraft to intercept final course?

As controller, I always wonder when should I instruct aircraft to turn. The aircraft does not turn at right angles as soon as instructed, but rather has turning radius. So, I tried to find the formula ...
4
votes
1answer
308 views

Testing control surfaces pre flight; what feedback does pilot recieve?

During taxi / pre-take off I see a lot of commercial airliners test the deflections of their various control surfaces like the rudder, ailerons etc. What's the feedback received in this operation i....
1
vote
1answer
46 views

Can the back tail of an airplane move the center oft lift backwards?

I´m currently in the process of designing a prototype aircraft and since I don't have very much experience with this I have the following question: I know that the center of gravity of an airplane ...
-2
votes
1answer
312 views

What happens to thrust and drag in a straight and level flight?

Straight and level flight means when an aircraft is flying at a constant speed without changing its attitude. Its lift is equal to the weight of the aircraft. It is flying at a constant altitude. Then ...
2
votes
2answers
89 views

Why are propeller driven aircraft commonly built with a higher wing aspect ratio and a straighter wing angle?

Why do propeller driven aircraft (especially smaller ones like fighters) tend to have a narrower wing with a higher aspect ratio and a more perpendicular wing angle in relation to the body, whereas ...
2
votes
2answers
84 views

Does the explanation of why slower airfoils are more efficient involve less energy loss from heating or compression of the working fluid?

We read time and time again, how more efficient slower airfoils such as helicopter rotors, props, and sailplane wings are compared with rapidly rotating fan blades or faster (still subsonic wings). ...

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