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Questions tagged [unmanned-aerial-vehicle]

An unmanned aerial vehicle (UAV), commonly known as a 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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3 answers
165 views

VTOL Propeller Sizing and Executing a transition from VTOL to Forward Flight mission profile

Hi I am an engineering student, currently in the process of designing a compound UAV drone capable of both vertical and forward flight. I've made significant progress, having completed initial gross ...
3 votes
2 answers
186 views

Engineless Blimp Navigation System

I understand wind direction can vary in a column of air? With only altitude control on a blimp to navigate for long flights, a blimp in theory could navigate without engines. In order to take real ...
-1 votes
0 answers
46 views

What happened to the SkyTote UAV?

The SkyTote UAV is a tail sitter VTOL UAV, which looks like the Convair XFY-1 Pogo (without the delta wing). I want to know whether this design ever transitioned successfully from hover to cruise mode....
-1 votes
1 answer
78 views

Can we use leaf shutter mechanism as a drone dropping mechansim for payload weight of 3lbs?

I'm considering implementing a drone payload drop mechanism capable of handling payloads weighing up to 3lbs. I'm intrigued by the idea of using a leaf shutter mechanism for this purpose, but I haven'...
1 vote
3 answers
153 views

Could an air-breathing electric propulsion (ABEP) or other form of ion propelled aircraft fly on Mars?

I'm currently in a class for aircraft propulsion and I became interested in Ion propulsion. It seems there hasn't been many developments for a few years as far as viable aircraft utilizing the ...
2 votes
2 answers
183 views

Does object mass have a significant bearing on wind interference?

I'm learning to fly RC quadcopters, and before I go outside with an expensive, possibly dangerous (if it were out of control and hit something) large unit, I've decided to practice flying for a while ...
1 vote
0 answers
52 views

Estimate the drag caused by wind on a free falling body

I'm trying to solve the following problem for my masters thesis: Estimate the drag caused by wind on a free falling body from H altitude. H is in range of 300-1000 meters. What would be the best way ...
0 votes
1 answer
135 views

Picking a NACA airfoil for a new propeller on a DJI drone?

The idea is to design a fairly simple propeller using Fusion software program that has a CONSTANT airfoil throughout (but that twists or changes in scale as it spans). I want a large coefficient of ...
0 votes
1 answer
66 views

How I determine numerically the pitch rate of an aircraft?

I have done aerodynamic analysis on a UAV. Is it possible to calculate pitch rate and yaw rate of my UAV depending on design parameters? (I have aerodynamic analysis of the wing, CL, CD, MAC, W, etc.)
1 vote
3 answers
224 views

What is the feasibility of using drones that can fly at 360kmh as anti aircraft?

What is the feasibility of using drones that can fly at 360kmh as anti aircraft? Linked under is a similar thread. However, with the prevalence of more advanced drones such as linked below wouldn't a ...
2 votes
1 answer
314 views

Practically, what should a pilot do to safely transit a UAS Operating NOTAM area when they must go through it?

Practically speaking, what should a pilot of a GA aircraft be doing differently when (if?) they have to fly through an area with a sUAS NOTAM? I have flown (while in PPL training with a CFI) in a ...
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1 answer
78 views

Portable VTOL Startup [closed]

I am Alessandro and I am currently developing a new portable electric VTOL that can be carried by car without a trailer and allows a flight time of around 15 min carrying one person. The expected ...
15 votes
9 answers
7k views

Why are there still fighter pilots in cockpits?

Way back in 2010, Elon Musk said, The fighter jet era has passed. And he seems to have a point. Although fully autonomous fighter planes are some way off (see above linked article), why doesn't ...
3 votes
4 answers
521 views

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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1 answer
90 views

Hexacopter Vn diagram/ flight envelope/ operational envelope

I am currently intern at a company. They are making agriculture hexacopter, now there is a confusion that does the hexacopter or multicopter have a V n diagram if yes how to make one what's the ...
1 vote
1 answer
130 views

Can a tail-sitter drone like the XFY-1 Pogo aircraft have any advantage over a classic quadrocopter

I looked at a few rc models of the xfy-1 pogo plane and wondered why there weren't more drones in this setup, some seemed very agile. I think this concept can be refined. of course, the contra-...
9 votes
6 answers
1k views

Have there been any cases of collision/airprox of small drones with manned aircraft?

Small civilian mini-drones such as the DJI Phantom or professional surveying drones are becoming increasingly widespread, raising concerns about the potential collision/airprox with manned aircraft (...
1 vote
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59 views

Which type of wing would be a better option for fixed-wing UAV? Mid or low?

In the context of VTOL hybrid Fixed-wing tiltrotor UAV, for the operation that would require low weight and more maneuverability for agricultural crop surveying, which option would be a good choice, ...
9 votes
2 answers
2k views

How AeroVironment's Switchblades steer their flight?

I'm very intrigued with how AeroVironment Switchblades: SW-300, and SW-600, steer their flight. There are plenty of images and animations and to my observation, none of the Switchblades have ailerons, ...
2 votes
0 answers
64 views

How do AeroVironment's Switchblades steer their flight? [duplicate]

I've recently been to a defense expo and saw a previewed Switchblade 300 at the AeroVironment booth. It got me questioning how the Swtichblade, and similar fold-out drones steer their flight. The ...
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0 answers
102 views

Deriving Accurate Exit air velocity of rotor

My goal is to derive the equation for exit air velocity as a function of: Pitch angle RPM Rotor Radius Constants like ρ Assumptions: Vc is relative velocity of air upstream, and is = 0 Inflow is ...
11 votes
3 answers
3k views

With existing tech and knowledge of meteorology, can aircraft be designed to reliably improve their range or loiter using updrafts to gain altitude?

Just what the question says. I want to know if aircrafts' range, loiter time, or other measures of merit can be dramatically and reliably increased using our current understanding of meteorology and ...
2 votes
2 answers
762 views

Finding longitude/latitude of a aircraft

I have been scratching my head for a long time on this one so any help is apperciated. How would I find longitude and latitude points of a UAV given this: True Airspeed Roll rate, pitch rate, and yaw ...
1 vote
1 answer
77 views

How to calculate the amount of differential cable delay between a four port directional antenna and a single port Omni directional antenna in TCAS II?

I want to select the amount of differential cable delay between the top (4-port directional) antenna and the bottom (1-port Omni-directional) antenna in the TCAS II RBP-7G connector pin. In the ACSS ...
-1 votes
1 answer
70 views

How to calculate the Traffic Advisory (TA) range limit above the maximum altitude limit (take 16000 ft) of an aircraft?

Let us consider an aircraft(A) with 16000 ft maximum altitude limit. Above which it cannot achieve 0.25 G vertical acceleration with 1500 FPM. Now, my question is if there is an aircraft(B) flying in ...
1 vote
2 answers
148 views

Telling an unmanned aircraft from its flight path

I'm not a hardcore fan of aircraft - I just like to know what is flying overhead and why... Some days I hear this loud annoying droning sound coming from the sky - it's usually a military unmanned ...
60 votes
5 answers
11k views

Why would a fighter drop fuel into a drone? [closed]

According to the BBC: A feed from a camera fitted under the fuselage of the surveillance drone shows a Russian SU-27 making two extremely close passes while releasing, what appears to be, fuel as it ...
1 vote
1 answer
88 views

What are the key differentiating factors between the flight control systems employed in unmanned drones and those utilized in piloted aerial vehicles?

"I've come across open-source projects like ArduPilot that are commonly used with microcontrollers like Pixhawk for unmanned aircraft. However, I'm unsure whether these systems can be adapted for ...
0 votes
2 answers
86 views

Are there equations to match power required to mass for rotorcraft?

Is there an equation (or table or whatever) to determine what power is required to fly certain mass? Probably there will be a bunch of nuances, but at least some sort of rule of thumb probably exists.
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1 answer
265 views

Has putting car tires over wings ever been used to protect the aircraft from airborne attack?

Recently Ukrainian bloggers have published videos, where Russians have placed the car tires on the wings of they parked strategic bombers (Tu-95), most likely to provide some protection against drones ...
4 votes
2 answers
572 views

Can you track drones online?

You can tracks planes, automobiles and boats on Internet, but does tracking technology exist for drones and if so, can you follow them online?
89 votes
6 answers
26k views

Why do we still use pilots to fly airplanes?

With the recent advances in drone and remote control technology, why are there still commercial and military pilots? I understand that there can be some serious tactical advantages to human pilots in ...
3 votes
0 answers
130 views

How long does it take the Predator UAV to reach cruise altitude?

For applications such as UAVs, especially military ones like the Predators and Reapers, do the same regulations as light aircraft apply due to their structure? Or, does the absence of a human operator ...
3 votes
1 answer
259 views

What would the effect be of flap deployment on a UAV such as the Reaper or Predator?

I've read answers that said that the climb performance is usually worse with flaps extended, and the pilots would, if they could, just retract them and get into a clean config as soon as possible. ...
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0 answers
82 views

How to find the equations used in an N2 diagram?

I am currently pursuing my research internship whose aim is to validate the airframe design estimation by FastUAV, an optimization framework (written in OpenMDAO) specifically tailored to unmanned ...
2 votes
0 answers
60 views

Unmanned aerial vehicles communication link: frequency/spectrum?

I am studying airborne platform: HAP - high altitude platform LAP- low altitude platform UAV - unmanned aerial vehicle ITU gives frequency allocation bands for link between ground and HAP/LAP/UAV, ...
8 votes
2 answers
2k views

In case of a drone strike with an airplane below 400 feet, who is at fault?

If a plane is flying VFR (see and avoid) below 400 ft, and the pilot collides with a drone due to not seeing the drone until it's too late to take evasive action, then would the pilot be at-fault for ...
0 votes
1 answer
251 views

What are this sensor especially those at tips?

This is an image of an RQ-7 B UAV what are those sensors marked in red circles.
0 votes
2 answers
192 views

Why was US-made Reaper drone downed but not Byraktar TB2?

Russian Su-27s used fuel dumping techniques on US-made MQ-9 Reaper (YouTube) and Turkish Byraktar TB2 (YouTube). MQ-9 Reaper plunged into the Black Sea, but TB2 didn't. Why was that?
1 vote
3 answers
2k views

Why is there no video of the drone propellor strike by Russia

I've seen lots of videos of the Russian aircraft flying near the US drone, but I've yet to see a video of the reported collision with the drone's propellor. Is there no video of the strike? If not, ...
0 votes
2 answers
172 views

Would I need a drone license if the drone is flown by ai and not a remote?

I heard of some AI flown UAV's and was wondering. if I made my own AI flown drone/plane would I need a drone license? (Assuming I would use it for commercial purposes and not just for fun).
0 votes
1 answer
456 views

Why aren't we using drone blimp/hybird airship for delivery? [duplicate]

Currently, the heaviest weight a commercial drone (the type that delivers Amazon package, not the type that delivers tons of stuff) can lift is 4.5kg with a 30-45 minute battery life. A drone blimp/...
3 votes
2 answers
230 views

Why does the V-Bat not counter-rotate?

V-Bat is a VTOL aircraft built by a company called Martin UAV. It seems to have a single pusher propeller. But then why does it not counter-rotate to balance the rotation of the propeller? Any clear ...
6 votes
2 answers
3k views

Should people flying UAVs be called "Operators" or "Pilots"?

I'm wondering if there is any formal/official definition* pertaining to the title given to people controlling Unmanned Aerial Vehicles? Are they "more" correctly titled Operators or Pilots? *As set ...
10 votes
2 answers
2k views

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 ...
3 votes
1 answer
148 views

Payload capacity of a quadcopter/helicopter with increasing altitude

I am trying to create a simplified model of a heavy-lift drone payload at different altitude during hover mode. I tried to derive it simply by considering that the thrust, $T$ is equal to the weight ...
0 votes
2 answers
239 views

Why does the P-175 polecat have two separate air intakes instead of 1 like most other UAVs?

I understand that the P-175 polecat has two engines which normally would mean one air intake for each engine, however other aircraft have used 1 air intake structure for two separate engines such as ...
19 votes
4 answers
7k views

What is the largest aircraft ever successfully flown and landed with no pilot on board?

I'm not sure if this belongs here or on the drone site. What is the largest aircraft (not spacecraft) that has completed an entire flight, including takeoff and no- or minimal-damage landing, either ...
7 votes
3 answers
1k views

Expected behaviour in Linkloss scenarios - UAVs

Imagine a remoted piloted aircraft like MQ-9 being controlled by pilot on the ground. I was wondering what is the expected behaviour of the aircraft when the connection with the pilot is lost? Does ...
2 votes
1 answer
199 views

Does a non-current private pilot need to renew his license to obtain a Part 107 (Remote Pilot) certification?

I am a non current private pilot (haven't flown for about 15 years) that need a 107 license for work to fly DJI drones. my employer is not going to pay around $1,000 to get me current again (it's been ...

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