# 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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### 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....
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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 ...
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### 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
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### 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 ...
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### 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.)
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### 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 ...
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### 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 ...
1 vote
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### 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 ...
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### 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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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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-...
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### 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, ...
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### 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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### 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 ...
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### 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 ...
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### 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 ...
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1 vote
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### 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 ...
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### 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
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### 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 ...
1 vote
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### 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 ...
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### 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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### 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 ...
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### 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 ...
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### 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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### 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 ...
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### 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, ...
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### 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?
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### 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, ...
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### 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 ...
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### 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).
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### 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 ...
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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 ...
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### 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 ...
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### 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 ...
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### 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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### 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.
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### How is pitch changed and lift generated in QNET VTOL (Vertical Take off & Landing)?

I am confused how QNET VTOL (Vertical Take off & Landing) works, especially how pitch is changed and lift is generated. I share a link of a relevant YouTube video and I am also sharing snaps of ...
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### 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 ...
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### Countries that have unmanned and manned fighter teaming projects [closed]

I have been wondering what countries currently have military programs related to teams of manned and unmanned fighter aircraft? For instance, I know that the US has several programs related to this ...
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### Can you put a propeller on the back of a plane, and have it go forward?

So, I was thinking about how drones work, and I can't figure out how drones with propellers at the rear of the drone can still go forward. I'm not that experienced in aviation so if this is a basic ...
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### Drone regulations - understanding how to figure out

I'll preface my question by mentioning that, while this might not be the strictly on-topic, I think this community is the best that can explain the flight zones and the flight regulations. I own a ...
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I'm thinking about light solar drones, and started wondering if you could hover while not using any power by flying downwind. Something similar to how prey birds hover while tracking the ground. It ...
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### Could ducted propellers improve efficiency in small drones?

I have seen that a new electric airplane design has decided to a choose ducted propeller design somewhat similar to the one of jet engines, explaining this design choice with the fact the ducted ...
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### 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, ...
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### Why do so many UAVS use a V-tail configuration?

How different is V-tail from a conventional tail in the perspective of aerodynamics & flight dynamics of aircraft? I have seen that many UAVs, like the General Atomics MQ1 Predator, LSI Amber, ...