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Questions tagged [quadcopter]

Questions about aircraft which use four rotors to provide lift.

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1answer
82 views

What's the smallest 3-blade propeller for this motor? [closed]

I've got a 15470 brushless 35kw motor from China How do I find the smallest 3-blade propeller I can use for this motor? Here are it's specs, Max Power: 35KW Max Amp: 400A Max RPM: 8500 Max Volt: 120v ...
1
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1answer
112 views

Quadcopter: would putting 3 blades on the same level and the other blade below the first three work?

Most quadcopters have their propeller blades all on the same level, or in some cases, a pair of blades placed a little above the other pair. However, I was wondering if three propellers of a ...
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0answers
27 views

Compute Thrust from RPM and Induced Velocity

I'm attempting to calculate the difference in thrust in a secondary propeller operating in the wake behind a primary propeller, in the context of a trailing quad-copter following a leading quad-copter ...
0
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1answer
158 views

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 ...
8
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2answers
326 views

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 ...
3
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1answer
183 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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3answers
256 views

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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3answers
176 views

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 ...
2
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1answer
75 views

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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2answers
189 views

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 ...
3
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1answer
235 views

Is the rotor described in this Kickstarter new?

A NewAtlas story linked to a Kickstarter for a the "Whisper Drone" that shows a CAD model of a rotor that the Kickstartee-aspirant has apparently 3D-printed and flown (four of) on a quadcopter. I ...
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1answer
870 views

What‘s the thrust of two stacked propellers?

Let‘s say that you have two identical propellers and each is powered by their own motor and together they produce a thrust of 1 kN. How does the thrust change if instead of operating them side on side ...
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1answer
274 views

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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2answers
224 views

Can quadcopters save energy by flying in formation?

If two or more quadcopters are aligned, would the effect of drag due to the lead quadcopter's slipstream lead to measurable energy savings? And if so, how would one determine the optimal distance ...
0
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1answer
293 views

Does the direction of rotation of the propeller affect the direction of the thrust generated?

Does changing the direction of rotation of the propeller from clockwise to anti-clockwise change the direction of thrust it generates?
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2answers
228 views

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. ...
3
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1answer
328 views

How is the flight of a tricopter controlled?

For a quadcopter, diagonally opposite rotors have the same speed and direction which causes it to hover, and adjusting the speed of the rotors give the three basic movements of a flying object, i.e. ...
2
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3answers
193 views

Could a quadrotor use a main gas powered rotor with small electric rotors for attitude control?

Here is my idea of heavy lifting quadcopter. (Although it is not a quad copter anymore because of the center rotor) Have a big coaxial fixed pitch rotor at the center. The rotor is gasoline fueled. ...
2
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2answers
3k views

How do I compute thrust of a rotor disk and the necessary power to drive it??

as it seems, this question has been asked a few times here so please forgive me for asking again. If I have 50 BHP shaft power available at 5000 RPM and 106 N.m torque, then can I convert it to 200 ...
7
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4answers
2k views

Can quadrotors be used for commercial passenger flights? [duplicate]

Recently, I have been conducting research on more efficient means for vertical lift transportation. One direction I was thrown in was the use of a quadrotor system with vector thrust and artificial ...
13
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4answers
5k views

Can a passenger drone perform auto-rotation?

(Source) The Dubai Drone is an Ehang passenger drone planned to start commercial services in July 2017. If there is a failure, can such an electric multi-copter auto-rotate a landing? I'm wondering,...
2
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0answers
169 views

Could this propeller work on a quadcopter and decrease the sound?

I came across a video yesterday that showcased a propeller design that looked very interesting. I am a regular drone flyer and I constantly look for exciting things to try out. Would this design in ...
2
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2answers
903 views

Could a tilt quadcopter use turbofan engines?

I was wondering whether having a quad tiltrotor would allow for the use of turbofan engine rather than turbo prop. I read on another question that the V-22 uses turbo prop as it is easier to balance, ...
3
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1answer
388 views

How can this single-prop drone maintain stable (rotating) attitude and position?

The short BBC news item and video The drone designed to fly on one propeller shows the flight of something that looks like quadcopter missing three of its propellors and motors. It continuously ...
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0answers
177 views

How is the required motor power calculated for a quadcopter?

I've been trying to find the required motor power for a quadcopter. I first calculated drag power and then I made a linear trend line for motor power against motor weight. I made the motor power 1.5 ...
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0answers
301 views

How to calculate optimal prop diameter, pitch, torque and power coefficient given required thrust?

this is my first post here, so bear with me if this isn't the right place. I'm coming here from Stack Overflow, and this seemed to be the most relevant Stack Exchange for my question. So, I'm ...
2
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1answer
1k views

Quadcopter propeller performance [closed]

Quadcopters use both direct and contra-rotating propellers to be able to turn and to balance the torque caused by the each of the propellers. Propeller performance measurement: When testing the ...
2
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0answers
289 views

Can quadcopter-like UAVs ever get significantly quieter? Any candidate technology?

The light weight quadcopter and hexacopter UAVs that can cary say 2kg to 20kg payloads for "delivery" produce enough noise that a steady stream of pizza and book deliveries might not be so welcome in ...
2
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1answer
167 views

What happens if one or more rotors are stopped during autorotation on a quadrotor?

I get the basics of autorotation when it comes to a helicopter in unpowered flight, but it's a bit unclear to me when it comes to quadrotors. My objective is to cover some directed horizontal ...
1
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1answer
240 views

How is propeller thrust vector accurately expressed for airplanes and multirotors? [closed]

For propellers, as the airspeed increases thrust decreases. Is the airspeed component taken as a vector quantity perpendicular to the propeller? If that's true, then it's quite easy to visualize in ...
5
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1answer
1k views

What is the weight of ballistic recovery systems?

How much does a Ballistic Recovery Systems parachute system weigh? I wouldn't want to use a personal quadcopter or jetpack without one. I wonder if they could be made small and light enough for a ...
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1answer
131 views

Just got a quadcopter, and not sure about a piece that came with it [closed]

My apologies if this is the wrong forum, but I have seen hot questions about drones/quad-copters from here in the past. I received a quadcopter recently (X5C Explorers), and it has a piece I can not ...
2
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1answer
214 views

Looking for the correct propeller shape to create a small copter [duplicate]

I am trying to create a mini flying quadrocopter using a Raspberry Pi (mini programmable computer). So far I have hooked up the RPi to 4 motors with controls to each. I'm pretty happy with that side ...
2
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1answer
693 views

Why is a model quadcopter 'better' than a helicopter? Why doesn't this scale up to the full-size versions? [duplicate]

EDIT Soon after I posted this, it was pointed out that a similar question exists. That other question answers most of mine. I shall leave this here as a stub. That way it provides a pointer to ...
7
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3answers
3k views

Do quadcopter propellers break the sound barrier?

I recently bought a quadcopter and noticed every time I fly it there is this weird buzzing noise. I have heard this noise on other quadcopters around the same size as mine(4in by 4in). On an airliner ...
0
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1answer
843 views

Is quadcopter design scalable? [duplicate]

I've been recently introduced to the world of mini aircraft, specifically, quadcopters - building them, flying them, calibrating them (apparently, it's such an important point that it deserves its own ...
15
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1answer
31k views

How to calculate the required motor power and rotor size with respect to the weight of quadcopter?

I want to build a quadcopter but don't have any idea about motor and rotor size selection. Is there a formula or equation to use? What are other things that need to be considered? Trial and error ...
3
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2answers
713 views

Is multi/quadcopter flight control similar to helicopters?

The wikipedia Quadcopter entry provides some details about its flight control: Hovering or altitude adjustement. Pitch or roll adjustment. Yaw adjustement. The following post "Quadcopter flight ...
79
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18answers
156k views

Why haven't quadcopters been scaled up yet?

Why are quadcopters not flown by human pilots yet? Wouldn't they be more stable and easier to control than helicopters?
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2answers
957 views

Does a quadcopter have flight modes beyond traditional aircraft?

Quadcopters, by virtue of software-piloting rather than human-piloting, are capable of new modes of flight. I've seen one in which the machine maintains altitude despite the loss of two rotors by ...