Questions tagged [quadcopters]

A drone which uses four motors to fly.

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17
votes
3answers
297 views

How does a quadcopter yaw?

I've always wondered how a quadcopter actually yaws, when all propellers are horizontal. I know that two of the motors spins faster, but I don't understand how that generates thrust in the horizontal ...
16
votes
3answers
4k views

Why are quadcopters inherently unstable?

I have heard it mentioned that quadcopters are inherently unstable and only become stable due to control. What does inherently unstable mean in this context, and why are quadcopters inherently ...
12
votes
5answers
4k views

Why do most drones have upward facing motors?

Most freestyle quadcopters I have seen are specifically designed to fly with the motors facing upward and have the arms of the drone underneath the propellers like this: As you can see in the picture ...
12
votes
2answers
183 views

Freshly built quadcopter/drone flips on takeoff

I just finished building my first quadcopter/drone and it flips when I try to take off. What could be wrong? What troubleshooting steps should I take to fix it?
10
votes
5answers
165 views

How to clean a drone?

I was just flying my drone when I crashed in some tall grass and there are now a bunch of grass bits all over the drone. How can I clean the drone without damaging it?
10
votes
4answers
230 views

Why did a quadcopter in vertical descent appear to lose thrust and descend rapidly?

Towards the end of a flight with a quadcopter, I started a vertical descent to come in and land. There was no wind on that particular day so I just came straight down. Shortly after starting to ...
9
votes
5answers
125 views

New Prebuilt Drone flipping on takeoff

I have a small quadcopter drone, immediately on takeoff it flips upside down, this happens all the time. What could be a potential problem? Edit: It is prebuilt and bought from a shop and has never ...
9
votes
2answers
122 views

Can I configure Betaflight in the field without using a laptop?

I often find myself wanting to make adjustments to the settings on my quadcopter in the field, especially when tuning PID settings and rate profiles. I currently bring a laptop with me wherever I go ...
9
votes
1answer
60 views

Quadcopter return to home function not working

I have a small S49 quadcopter. Whenever I am flying it and initiate Return to Home on the controller, it always returns to the wrong location compared to where it launched from. Sometimes maybe 5/10 ...
9
votes
2answers
536 views

What are the advantages and disadvantages of a “plus” and “cross” quadcopter configuration? Is one preferred over another?

I'm not really an expert when it comes to quadcopters, I heard about the "plus" and "cross" configurations and that the "cross" configuration provides more stability. I ...
9
votes
2answers
147 views

Why do a quadcopter's opposite rotors spin in the same direction?

All the quadcopters I've seen have four motors, arranged in a square-like shape. Two of these rotors spin one way, and two of them spin the other way so that the main body of the quadcopter doesn't ...
8
votes
4answers
607 views

How does frame stiffness affect a quadcopter?

When choosing a frame for a drone, something I hear mentioned occasionally is how flexible the carbon fiber is. It seems that the general opinion is: more flex in a frame is worse. How would having a ...
8
votes
3answers
140 views

What process should I use to ensure my motors are spinning the correct direction when using Betaflight

I heard that a lot of problems occur due to one or more motors spinning the wrong direction. What process should I take to ensure that all my motors are spinning the correct direction if I'm using ...
8
votes
2answers
91 views

Vertical Flight Paths

I've been searching around for software to allow a vertical flight plan. For example I want to flight 50m across a building at 20m AGL. Then drop 1m and fly back 50m. So on and so forth. I've read a ...
8
votes
2answers
86 views

Is it a good practice to use a throttle limit of 90% for racing builds?

I had read somewhere that it's a good idea to set a throttle limit of 90% for racing. The reason given was that, in the last 10% of the throttle, the cost/benefit ratio for power to thrust would not ...
7
votes
3answers
190 views

How to determine the lowest safe ESC current rating for a drone build?

I was planning to build a quadcopter and was wondering how I should decide what ESC to get. I'm asking about ESC current ratings. I am building a 7 inch drone using 4s with 2306 1900Kv motors. I have ...
7
votes
2answers
165 views

How does a quadcopter flip without falling very much?

I have a quadcopter and it has a flip function (as do many other quadcopters). I was wondering how this works. Say I am flipping it right (clockwise), I assume the motors on the left spin much faster ...
7
votes
2answers
77 views

What are the benefits to different types of frame arrangements?

When looking at different frames, there are lots of descriptions for different ways the arms are set up. Are there objective descriptions of how these arrangement change the flight characteristics ...
7
votes
1answer
75 views

Which settings in Betaflight allows me to do flips and rolls?

I see a lot of people flipping and rolling their quads, but on my last attempt, it fell out of the sky. What are the settings in Betaflight that allow them to do this without stopping the motors?
7
votes
2answers
93 views

How to pick parts for a quadcopter flying on Mars?

So let's say I wish to build a quad to fly a GoPro around in Mars. How should I go about planning the build (target AUW [all-up weight], motor to motor distance, propulsion & power system, etc.)? ...
6
votes
3answers
46 views

Keep quadcopter steady when taking a video

Whenever I take a video on my small quadcopter, it’s never steady. It always bounces up and down a bit rather than keeping level. How can this be stopped/prevented?
6
votes
1answer
208 views

Visual references when driving a Quad Copter through gates

I am a complete beginner, starting to learn to fly. So far I managed to control the altitude and do some basic turns, I can also do figure eights if the flags are well far from each other. I realised ...
6
votes
1answer
31 views

Quadcopter Stability Modelling

We know software like XFLR5 to model fixed-wing aircraft to determine aircraft dynamics and stability. Is there any software which we can model our quadcopter geometry in so we can know it's CoG, ...
6
votes
2answers
74 views

Are these methods of Drone Localization Techniques for a dark environment plausible?

I am working on a project where I need a quadcopter to accurately know its location relative to a starting point in a GPS denied environment in the dark. A quick overview of the project: The drone ...
6
votes
1answer
49 views

How to clean dirt out of my miniquad motors?

I accidentally crashed my 250 class quadcopter into the dirt today and got dirt all over it, including into the motors. I managed to clean the dirt off of the frame and electronics, but I have no idea ...
6
votes
1answer
282 views

What mission planner should I be using for INav?

I'm new to the quadcopter community and am looking to plan my first mission for my drone. As far as I can tell, the recommended mission planner is an Android app? I am hoping there is a good ...
6
votes
1answer
105 views

Quadcopter rotates too slow

When I flew my drone yesterday, all the manoeuvres I did felt really slow. I then went into the OSD and changed the rates a bit. The drone then acted as it should, but when I then changed back it ...
6
votes
1answer
40 views

DJI F450 ESC calibration fail

everyone. I am building a DJI F450 clone. I've got everything attached except for the propellers. The Pixhawk connects to my mission planner via USB. The remote controller is paired with the drone. ...
5
votes
1answer
97 views

Finding a ready-to-fly Taranis compatible, Eachine compatible, S4 compatible under 200€ drone

The question I'm looking for a drone under 200€, preferably 5" (as that's what I'm used to) but other sizes are ok, that can be purchased/delivered to France, is compatible with a Taranis X7 and ...
5
votes
2answers
102 views

What impact does a shroud have on the torque produced by the prop(s) of a multirotor that incorporates a properly designed shouded propeller?

Based on the research presented here: "Hover and wind-tunnel testing of shrouded rotors for improved micro air vehicle design" and other reading that translates similarly well-designed shroud and ...
5
votes
1answer
148 views

What's the purpose of airmode and idle up?

What are airmode and idle up and what do they do improve my freestyle flights?
5
votes
1answer
124 views

Why don't solutions exist for a 3-axis helicopter flight controller?

So I've been searching around for a 3-axis flight controller for my 450-size helicopter. It seems that nearly every flight controller which is sold today is configured for solely the control of quad/...
5
votes
2answers
613 views

Will this set up fry my components?

Frame: Carbon fiber 250mm Motors: 2300Kv 2204 Power board: Matek built in BEC’s 12V + 5V FC: CC3D ESCs: HLGRC 30A opto (no BEC) Battery: Turnigy Graphene 14V 75C 4S Receiver: Turnigy iA6B My question ...
5
votes
1answer
1k views

How does the center of gravity affect a quadcopter?

I have heard a lot about center of gravity for fixed wings, but very little about the CG in quadcopters. How does moving the CG forward or backward impact the flight characteristics of a quadcopter? ...
5
votes
1answer
89 views

Is WiFi drone control protocol standardized?

I'm searching for an app to control a Zerotech Doby drone. The official app "DoFun" is no more available, but surprisingly it works with another Chinese app "FlightGo". I wonder if ...
5
votes
1answer
43 views

What is RPM filtering in Betaflight?

I've seen a lot of buzz lately about the supposed advantages of using the RPM filtering option introduced in Betaflight 4.1. What is it and how does it improve inflight smoothness?
5
votes
1answer
78 views

What is a good 3'' BNF that can be used indoors and outdoors?

I am looking to get a new quadcopter that will work in a variety of places. I want it to be a 3'' drone so that I can fly it both outside and inside. I would prefer if it had prop guards or ducts of ...
5
votes
1answer
44 views

Kk2.1.6 falling in mid air and losing control

I am recently flying my DIY quadcopter built with lightweight aluminum bars and a kk2.1.6. It was a very good experience until it suddenly started losing control and it fell midair. It tried to gain ...
5
votes
1answer
55 views

Accessing the video feed of a cheap FPV drone

A while ago, I bought a small and cheap WIFI FPV drone to fly in the office and at home (not outside). It's very funny (It's my first drone ever) and now I would like to access the video stream ...
5
votes
1answer
167 views

Betaflight with Mamba F405 MK2 stack 40A ESC's and XING-E 2207 motors problem

I build a quad using Mamba F405 MK2 stack 40A ESC's and XING-E 2207 motors. Here are some pictures of my configurations on Betaflight and BLHeli Configurator: https://imgur.com/a/mFLDiVp Also video of ...
4
votes
2answers
75 views

Quadcopter getting hot after a flight

I have a small quadcopter and after around a 10 minute flight, I can feel it gets very hot. Is this normal?
4
votes
1answer
64 views

Suitable ready-to-fly micro copter for a beginner

I read several docs on the ardupilot website, in particular about building a copter. It was suggested that total newbies (like me) should buy a small inexpensive copter first and learn how to fly/use ...
4
votes
1answer
57 views

How do you use the PID controller to compensate for a higher weight?

How should you adjust the PID values if you add weight to a quadcopter (For example a GoPro), so that the flight characteristics stay as close as possible to how they were before? I assume that the ...
4
votes
1answer
38 views

If AUW is 90 grams, will 4500Kv motors be better than 7500Kv?

I have a build that is 90 grams and runs great with 7600Kv motors. My question is, if everything stays the same and I put on 1204 4500Kv motors on it, would I get more flight time? More power or ...
4
votes
1answer
35 views

Flight controller or ESCs on Eachine Viswhoop not booting properly

After last flight my Eachine Viswhoop stopped booting properly and arming (link to gfycat with sound). When connecting battery to drone I can hear FC beeping but don't get second set of "beeps&...
4
votes
1answer
130 views

Serial Communication Not working in APM 2.8

I have being trying to establish Serial Communication connection between APM 2.8 and Raspberry Pi Board. But the connection is not being recognized in the Raspberry Terminal Console. Configuration ...
4
votes
1answer
41 views

Vibrating like a jelly when takeoff

I have Kotleta 20 UAVCAN ESCs. When I trying to increase throttle, motors are vibrating like a jelly. How can I configure my ESCs via development port? What are best options for non vibrated flight? ...
4
votes
0answers
22 views

What is the frame system defined for Orientations comptutation using Quaternions [Madgwick filter/ Mahony filter]?

I am working with MPU9250 and I have implemented attitude & heading reference system based on Madgwick/Mahony filter. I capture the raw data [accel, gyro, mag] and pass to the Madgwick filter in ...
3
votes
5answers
241 views

How to determine the largest LiPo I can use in a quadcopter?

Multirotors can usually operate with a larger battery than recommended for longer flight times but slightly less performance. However, there is a point of diminishing returns at which increasing the ...
3
votes
3answers
59 views

Wired drone using very high voltage?

For those of you who don't know: electricity can be "stepped up" to carry the same amount of power over a thinner wire, over much longer distances with minimal losses. Once the power reaches the ...