A little bit of theory: How do Quadcopters fly?

How do Quadcopters fly?


Quadcopeters as the name suggests use four motors to fly. Two motors rotates in clockwise direction and another two in counterclockwise direction. In this way their are balancing quadcopters rotation. When four clockwise motors would be used on the copter, it will start rotating always in clockwise direction and if only four counterclockwise motors copter would be rotating in counterclockwise direction. Having two pairs of contrary motors cause Quadcopters to stay in place. Peacefully hovering above ground. When speed on all motors equally increases or decreases drone will vertically take-off from the ground or

Good to know: lift, drag and thrust.



Quadcopter or any other copter, airplane or object can be rotated around three axis, they are called roll, pitch and yaw.

  • Rotation around the front-to-back axis is called roll.
  • Rotation around the side-to-side axis is called pitch.
  • Rotation around the vertical axis is called yaw.

Airplanes use ailerons, rudder and elevator to rotate around one or another axis. However copters doesn’t have them instead use four motors with propellers. Airplanes are more intuitive to understand but quadcopters are not as complex as they look.


Roll, Pitch & Yaw

Always to rotate drone through one or another axis two motors on one side need to speed up and other two motors on opposite side must be inversely changed.

Roll axis


To lean drone to right both left motors speed need to be increased and speed of both right motors decreased. To lean to left both right motors speed should be increased and left decreased.

Pitch axis



Rotating a drone thought pitch axis requires speed change of back and front motors. To lean forward speed of ‘front’ motors need to be decreased and speed of ‘back’ should be increased. To lean backward speed of ‘front’ need to be increased and ‘back’ should be decreased.

Yaw axis



Yaw axis full move explanation is a little bit more complex then other two axis. I would like to explain the basics here but if you would like to know more, just google it. Also good thing is that all flight controllers have this knowledge injected to their ‘brain’. In the nutshell, to turn drone left or right two diagonally across motors must speed up and second two should slow down.

Investigation of adequate drone. #Part 2: Drone parts – my build.

Last week I started “Investigation of adequate drone” series. I will share my whole Do-It-Yourself drone experience. Today we will go through quickly through elements quadcopter drone is build from.



Quadcopter is a great type of drone to start with. Is more agile then hexacopter or octacopter as it’s smaller which makes it more easier to control and safer then it’s other bigger or more complicated brothers with doubled propellers.

It is good to remember that propellers are like little knifes which can hurt, so be careful!

Finally quadcopter I think is the cheapest look-like-popular-drones copter overall starting from frame price to number of propellers.

All my future blog posts will be related to quadcopter drone as that’s the drone I bought.


Drone elements


Below I would like to list all parts I think are necessary to build a proper drone. Also giving you name of element I have bought as I know now how hard it is to build your own drone. I was strangling, comparing, thinking and planning all week to finally order this what is in below table.

When I was ordering my quadcopter I was really close to skip couple elements like e.g. power distribution board or very useful mounting foam and other little but sometimes critical elements. Unfortunately, other blogs I have read about building a drone doesn’t include such as ‘not importans’ elements. Which I think is wrong as without them assembling the drone still will be possible but much harder to do.

Below is the table from my excel file which contains my drone elements. Actually it contains everything related to my very first drone assembly including threadlocker and heat sink tubes.

Table of my drone elements

Elements type What I bought
Multicopter frame F450 Quadcopter Frame with integrated PDB
Motors MT 2216 810Kv Muticopter Motor
Propellers 9443 Self-locking Propeller Pack
Propellers 10×45 Propeller Set Carbon Fiber (discount)
GPS Mount Foldable GPS Mast Mount
LiPo battery Tattu 1300mAh 14.8V 45C 4S1P Lipo Battery Pack
LiPo battery GENS ACE 3300MAH 11.1V 25C 3S1P LIPO
Wiring Navio Wire pack for Navio2
Flight Controller board Navio2
GPS Antenna GPS/GNSS antenna MCX for Navio
Propellers guard 5″ PROPELLER GUARD PACK
Cables Male XT60 wire – 10cm
Cables Female XT60 wire – 10cm
T-plug cable MALE DEANS / T-PLUG WIRE – 10CM
Adaptor Male T plug to Female XT60 Adaptor
SD  16GB microSD

As you can see I didn’t add any gps antenna and microsd card as I had them at home, but you can easily look for them at any shop. Also I haven’t ordered threadlocker blue, battery holder and heat shrink tubes as I bought them in local store.

Some parts could be unavailable in store you will be buying from, then I would recommend to find similar elements but from other manufactures. Trust me it is hard to find a copters related store which will have everything you want. Most of the time it is a hunting for the best equipped store which have as much items you need.

My order

I order everything from Unmannedtech as they had elements all really wanted plus some others in decent price. In my case I was looking for store which will have F450 Quadcopter Frame, not to expensive carbor fiber propellers, navio2 board in good price and decent cheap transmitters. Which I all found there. But as I live in Ireland it was a priority for me to order from one shop from Ireland or UK. If you leave in UK or another in EU where you have more diy shops or you have couple weeks to wait for an order you will be might be able to lower the costs by ordering from couples different stores