Drone drops when I yaw (Sky hero Anakin)

[ian1981]

Hi all,

I am trying to get some advice, I have been taking my drone out a fair bit recently, however it is a long time since I tried to do anything software wise on it, so I am now looking for some advice on a couple of issues I have.

1. When I Yaw left or right, the drone seems to drop sharply... Not sure why, I can maintain it's altitude quite well with the controller that I have but as soon as I Yaw, that's it, it becomes very hard to control. Does anyone have any recommendations on where to start with which software I should be using and what the best flight controller is for stopping this from happening? (I am quite new to building and modifying a racing drone so please forgive my ignorance, if there is something else I need to look at, (even the pilot!) then please let me know.

which brings me on to my next question!

2. To get more used to using this Drone, I am using the original flight controller that came with it, which is a Sky Hero CC3D controller. Is there a flight controller where I can bring the stick back to the centre and it will remain at the altitude I took it up to to help me learn more about how to control the drone with better ease and accuracy?

Thanks in advance for your help.

Ian

[Cheredanine]

Lol ok let’s see what we can do.

A quad has 4 motors, 2spining in one direction, two spinning in the other. In theory when it is hovering all motors are spinning at the same speed (over simplification but it will do for now)

When you command it to yaw it spins up two motors and spins down the other two, this produced toque, forcing it to turn on the yaw axis but keeps it stable on the other two axis.

In order to manage this the quad uses its gyro to sense changes in aspect, it doesn’t have any understanding of altitude inherent in this, and it is particularly prone to changing altitude when doing this sort of manoeuvre.

Racing quads don’t usually use any sort of altitude hold, that is usually done by the pilot with practice.

If you want to do it, you need to have a sensor that can measure altitude, typically a barometer, these are not generally included in flight controllers for racing quads nowerdays but a few have them, they are generally on delux models.

I don’t think the basic CC3D had one, but then the F.C. is so old I don’t recall well enough to be certain.

So in order to achieve point 2, you need an FC with a barometer on it, you need to have the barometer turned on and calibrated and it needs to be in altitude hold mode

Also note, as described above, without further sensors (compas and GPS) although the quad will hold altitude it won’t hold position but will happily drift off, I think what you are after is likely to be more the phantom style of flight than a racing quad, in which case you want to look at the unavoidable software and compatible flight controllers

[Two-Six]

I was just about to post this but you beat me to it!

Hi Ian
Your quad drops because in order for a quad to yaw two of the four motors need to be slowed down so reducing their torque effect and causing the yaw.  This causes loss of lift.  With a bit more practice you will probably learn to compensate for this automatically and not even notice that you are doing it

The other thing that might well be happening which makes things worse is that you are putting in a bit of down or up stick as you put in yaw.  I find it very hard not to do this.  Its a very normal thing to do and it takes a lot of practice to not mix up your control inputs a bit.  That's how people who fly aerobatic models in competitions get high scores because they don't inadvertently mix control inputs.

As far as setting the throttle stick so the quad will hold its altitude need at least a flight controller with a barometric sensor.  However these barometric devices aren't  that great so for a super stable altitude hold you will need GPS.

Practically, this means if you want this degree of altitude stability you are looking at a DJI product as building your own could be quite expensive and complicated.

[ian1981]

Hi both,

I have to admit, the suggestion about mixing up my controls is probably what I am doing wrong, the lift and yaw are on the same stick, so I might experiment in changing the controls around a bit, I expected the motors to power up and drop respectively but not to the point the drone drops so sharply, I'll get practising with the controls and start working on my stability!

I want to avoid a new flight controller with barometer at the moment as I know that negates the point of any kind of racing drone, it was more for me to get used to the other controls while it stabilises...

Thanks again for the suggestions, I will get working on my lack of skills! lol

Ian

[Two-Six]

Don't mix your controls about!   Most people usually stick with mode 2 that is throttle up/down on the left stick and rudder L/R then elevator/nose up/down and aileron/roll/left right on the right stick. 

The other popular way of doing things is mode 1 but that's just too weird so you don't want to go there lol.

What you can practice it trying to not mix in up down with left right etc and a sim is very good for that, especially if you fly other aircraft other than a multi-rotor sometimes.  I just can hardly ever do a loop with my planes or helicopters in AccuRC without putting in roll too. In a sim you can show your stick positions and often record your flights so you can see how you are cross-controlling things.

In fact with all multi-rotors you will need to constantly adjust your throttle, as the angle of the MR changes the lift changes too.  After a while you won't notice and you will get used to changing your throttle position to hold a steady height.

Do you fly it FPV? (First Person View(with goggles/screen))

[mo_miah]

on my old flysky tx that i started with i tighten up the throttle stick so i dont change throttle too much when i yaw