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Questions tagged [unmanned-aerial-vehicle]

An unmanned aerial vehicle (UAV), commonly known as drone, is an aircraft without a human pilot on board. Its flight is controlled either autonomously by computers in the vehicle or under the remote control of a pilot on the ground or in another vehicle.

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How to implement an intelligent control technique for a quadcopter [on hold]

I have a drone weighing less than 250g. The position of the drone is continuously monitored using an overhead camera having a refresh rate of 30Hz and the drone has a marker attached to it for ...
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What disadvantages does flying a drone close under a ceiling have?

If I want a drone (quadcopter) to be flying always under a surface and close to this surface (i.e: under a table 5cm away from the surface), which are the disadvantages this would have in the lift ...
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What are the failure mode(s) for flying cars in case of power loss?

There seem to be lots of plans (and even some working prototypes) for various autonomous flying cars and flying taxis. Most of these seem to be based on vertical take-off using some variety of an ...
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Are there any photos or videos of the drones at Gatwick?

The Gatwick Airport drone incident from 19-21 December 2018 involved "67 reports of drone sightings close to the runway" (Wikipedia). However, police stated there were no photos or videos of the ...
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How does scaling of UAV size impact range?

Lets say you have two autonomous small aircraft, one with a wingspan of 200 cm and one with 400 cm. Both have the same general design. They are both optimized for travel distance on one full tank (gas ...
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What would be a safe minimum vertical separation distance between passenger-carrying multicopter aircraft?

There is increasing talk about employing passenger-carrying multicopters ("taxi drones") to extend urban mobility into the third dimension. These aircraft will have MTOMs in the range of several ...
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Could a quadcopter fly if its propellers were encased in cylindrical tubes?

Picture a standard quadcopter, with regular old propeller guards, which are generally just circles around the propellers. Now, take the propeller guards and stretch them so that they're cylinders ...
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Why hasn't anyone tried making two propellers facing upwards and the other two facing downwards? [closed]

Within a quadcopter, I know usually it's all the propellers facing upwards or all of them facing downwards. Why hasn't anyone tried making two propellers facing upwards and the other two facing ...
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Can quadcopters still fly with propellers at an angle?

Can quadcopters still fly with propellers at an angle? By this I mean like the whole motor mounts will be situated along a certain slope (so as to be neither horizontal nor vertical). UPDATE I meant ...
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quadcopters — should the propellers/motors all be at the same height

In quadcopters (or in any other drones), must the propellers/motors all be at the same height, or can there be symmetric height differences (like for eg, two of the motors at the "back" are elevated ...
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Why do drones look different from common airplanes? [duplicate]

In this video is shown Top 5 Military Drone. As we may see, the shape looks different than usual airplanes. My concern is especially with the tail. Normally we know that the tail is vertical. But from ...
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What were DJI drones spying on? What data did they capture? [closed]

In late 2017, it was claimed that DJI (a very popular Chinese drone company) was working with the Chinese government to spy on the United States via their drones, or their drone controllers, which are ...
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What are some of the fastest UAVs? How do the pilots ensure that their controls are being transmitted to actions?

I would clarify that the drones I refer to are UAVs that were piloted using a control station. I know many military projects include such capabilities but I want to know how pilots work on such ...
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Must quadcopters have the same propeller sizes?

I was flying quads today and it just suddenly popped up into my mind — do the propellers all have to be the same size in quadcopters? Mine are, but What if two propellers were larger and the other two ...
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What is the feasibility of solar powered drones?

What is the feasibility of solar powered drones? From my understanding, solar panels are becoming more and more efficient, in terms of weight vs energy captured, and in terms of surface area vs energy ...
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Can “a drone” damage the wing of “an aeroplane” to the extent it actually threatens its ability to fly?

I stumbled across this video by the University of Dayton, showcasing the amount of damage a certain type of drone can do to a wing, and they wrote a whole article about it. While most of said article ...
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Where is V15 and how do I find it?

My question: Where is V15 and how do I find it? The question referred to in the practice test: Refer to the figure 21, area 2 below: What is the floor of controlled airspace along V15? The ...
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What kind of cameras are onboard high altitude UAVs that aid in its control?

I ask this question in the context of people flying their drones much higher than the usual hobby planes. Satellite based GPS navigated Autopilots using photogrammetry and/ or military drones. What ...
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Is there any fixed-wing UAV common research model available?

Is there any source of structural specifications data available for a particular fixed-wing UAV, that can be used for comparison with a resulting structure, obtained by a structural optimization ...
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How does the number of blades affect the static thrust of a propeller? [duplicate]

Since I couldn‘t find an answer to this question I thought I‘d ask you guys! By which factor does the thrust of a propeller increase if I double the number of blades, the motor being powerful enough ...
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1answer
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How do I properly report sighting a drone or hobby UAV to ATC?

How would one go about reporting a drone (hobby UAV) sighted in the airspace of an airport on frequency, specifically to Tower? For example: I am doing patterns around the airport when to the ...
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How to fly a drone in Class D in Italy?

I am traveling for a wedding which will take place in Monza Park, Italy. According to Italian Airspace Pro, the location I would like to fly, the southern half of the park, is technically in Class D ...
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Are there any situations in which drones may legaly fly higher than 400ft?

FAA FAR 107 states, "The maximum allowable altitude is 400 feet above the ground, and higher if your drone remains within 400 feet of a structure." Are there any exceptions to this rule that ...
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Are there any aviation vehicles for Internet service?

Facebook announced on Wednesday (2018.06.27) that it is ending its Aquila drone program after four years of development. Aquila was a high-altitude platform station (HAPS) system designed to deliver ...
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Calculating the maximum altitude of a drone [duplicate]

Is there an equation to find the maximum altitude that a drone or quadcopter can fly to ?
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Is a ground station radio license required for UAS operations in the US?

When conducting UAS operations would a PIC or Spotter be considered a ground station or an air station? The communications would concern a sUAS in the air, but the radio is physically on the ground. ...
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Has the United States started a drone crop spraying program for farmers?

On "NHK World" (2018.06.01), a news segment showed Chinese farmers being taught to use drones to spray chemicals on their crops. The Chinese Government hopes to train all the farmers in an entire ...
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1answer
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Could an amateur build a full-scale UAV?

FAA section 333 provides permission to fly in the NAS with an airworthiness certificate. Obviously, the design would need to be perfect with extremely redundant control schemes. Going through the red ...
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3answers
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Are piezoelectric energy harvesters too expensive to be used commercially as a power source in drones or small aircraft?

Piezoelectric energy harvesters can draw energy from the mechanical loads and the vibrations in the fuselage/wings/blades of aircraft. What are the disadvantages of such a system being used as an ...
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2answers
150 views

Why do we not have autonomous helicopters? [closed]

We see a lot of fixed wing autonomous UAVs. What is preventing this in the case of helicopters? I know the helicopter flight dynamics are complicated. But what exactly is the complication in this ...
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2answers
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How is notification of UAV flight handled in an area with multiple heliports?

I'm trying to get up to speed on drone licensing and regulation. I'm in central Houston, well away from either of our major airports; but there are literally 50 heliports listed on B4UFLY as being in ...
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1answer
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Consumer Drones with multi-blade (more than 2) propellers

Maybe unusual question but it's related to Aviation world, even if is more directly related to Drones one. Why almost all consumer drones like DJI's and Yuneec's ones (but it's true also for other ...
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What are the FAA regulations on operating UAVs in class E airspace above FL600?

What are the regulations on flying UAVs (commercial or experimental) above FL600, i.e. in class E airspace above class A? I want to make a HAPS (High Altitude Pseudo Satellite) and operate it in the ...
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Does the ICAO definition of an “aircraft” include a minimum altitude capability?

The German air law includes in their legal definition of a "Luftfahrzeug", which is the equivalent of an aircraft, other devices intended to operate in the airspace if they are capable of being ...
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Precipitation Static on Drone

I read a bit about Precipitation Static buildup on the outside of aircraft flying through dust, rain, or snow. Can this also happen on a small drone and if so, could it interfere with controlling it? ...
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How did Northrop Grumman propose to make the Global Hawk nuclear powered?

Reading further after receiving this answer, I saw the section on nuclear power in the Wikipedia article on the Northrop Grumman RQ-4 Global Hawk: Nuclear power Sandia National Laboratories ...
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What is this NASA UAV, and what is its function?

For the question What's up with the “What's Up at Wallops” app? I was reviewing the What's up at Wallops website and drifted to the launch photos page where I saw this aircraft. I did not find a ...
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How would a low-airspeed fixed-wing drone be designed to reduce effects from gusts and wind shear?

In a story I am working on, the characters need a fixed-wing drone that can rendezvous with a blimp, where by "rendezvous" I mean "come within a very short distance at low relative airspeed". The ...
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If the Quadcopter is a MIMO Nonlinear System, How Can it be Controlled using PID? [closed]

I know that it is very common to control quadcopters using PID algorithms. I'm just wondering if it isn't a problem that the system is highly nonlinear as well as having multiple inputs and outputs. ...
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How do small unmanned fixed wing aircraft protect themselves against lightning strikes?

I'm asking this question after doing a small research project to see if a small UAS can fly through thunderstorm and trigger lightning strikes. I've googled a bit, and all I've seen are large aircraft ...
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1answer
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Is it practical to use wires to stiffen rotor arms?

(Related to my last question on ducting.) Wires have been used in the past to stabilize wings with a very low weight cost. Could something similar be use to stabilize the arms for a UAV's rotors? ...
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2answers
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Can an ultrasonic sensor mounted on a drone pick up another drone strongly enough to sense and avoid?

I am asking this question to see if mid-air collisions of drones can be prevented using simple analog sensors. Can an ultrasonic sensor mounted on a drone pick up another drone strongly enough to ...
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Does ducting help to stabilise heavy lift drones?

I'm looking to build a UAV that is extremely stable. It doesn't have to be fast, it doesn't have to be agile, but it will have to carry up to 50lbs (agriculture focused UAV that has to operate for at ...
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3answers
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Can I fly a UAS that weighs more than 55lbs if I'm on private property?

Can I fly a UAS that weighs more than 55 pounds within my own private property if I stay below say, 200 feet? I do not have 333 exemption
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1answer
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How exactly am I supposed to notify ATC when I fly my drone? (UAS)

I recently registered my new 250 class Quadcopter with the FAA under the Part 107 sUAS code. I want to fly within the regulations, and the only one that I'm really unsure about how to abide by is the "...
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1answer
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Are there regulatory bodies for investigating UAV accidents?

Is there an international regulatory body for investigating UAV accidents? Does it exist on any national level?
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How do engineers make sure UAV don't land on their front propeller?

Take, for instance, the following UAV: and suppose you have a payload with a very big volume that fits exactly in the fuselage (and there is no more space), but is extremely light. Thus, the heaviest ...
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1answer
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Does a LSA or better license count for drone use?

I have a FAA private pilot license. Does that allow me the same flight privileges while flying a drone, as a FAA certified drone pilot?
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1answer
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Does it make sense to use a canard in combination with a conventional aft elevator control surface?

I am designing a UAV and have settled on a canard design. However, I’m curious whether it would be helpful to have a typical horizontal stabilizer behind the wing as well as a canard wing in front of ...
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Is there a recommended self-study syllabus or set of books for UAV design? [closed]

I'm junior software engineer (C/C++/Assembly) in a UAV project. After working there for some months I decided that it would be very interesting to start my own project. So, my goal is to design my own ...