May Drones Auto-Rotate Like A Helicopter?

May Drones Auto-Rotate Like A Helicopter? Drone Tips
May Drones Auto-Rotate Like A Helicopter?

I had been flying my drone the other day, and as I used to be looking up at it, I wondered what would happen if it instantly lost power? Would it be able to auto-rotate and land safely? Nicely, I did some study and here’ t what I found!

Drones that are offered on the market have a fixed-pitch rotor design, meaning they are not capable of auto-rotation. For a drone to be capable of auto-rotation, its rotors would need to possess a variable pitch design like a helicopter, although some drones do have this particular design and are capable of auto-rotation.

To find out more about the technicians of auto-rotation and exactly how it would focus on a drone, continue reading!

What Exactly Is Auto-Rotation?

Auto-rotation is a state of air travel where the primary disc system of a heli-copter or an airplane similar to it, such as a drone, turns by air moving up through the rotor rather than utilizing the engine power to drive the rotor.

The movement associated with air upwards allows the blades to turn or rotate automatically without the assistance of the motor. This is possible because of the design of the rotors. In order for this to be possible the aircraft needs to have variable pitch propellers. Video can’ t be loaded because JavaScript is disabled: Full straight down autorotation with MD-500E from Hungarian Surroundings Police, Siófok-Kiliti (

Movie showing helicopter getting using autorotation

Why is it essential?

Many helicopters have this sort of design for their rotors, as it would be devastating if a helicopter were to lose power up without the ability to land! This is important because it provides the pilot the ability to control a glide down to the ground if a good engine happens to fall short.

Engine failure in a helicopter is the most common reason for this feature. Another reason why it is essential to have auto-rotation is that a quadcopter that is capable of auto-rotating is less likely to be damaged in a crash.

This is mainly a possibility because the pilot that is operating the particular quadcopter will have more options for bringing the quadcopter to the ground lightly if something goes wrong, whereas a quadcopter without this particular ability is most likely just going to drop out of the sky and crash into the ground. Video can’ t be loaded because JavaScript is certainly disabled: 4K drone loses power and crashes (

Drone a crash out of the sky abruptly.

Common Errors Whenever Auto-Rotating

Listed below are just a few of the main errors pilots make whenever in an emergency plus attempting to auto-rotate:

  • Lowering the nose of the airplane suddenly when you reduce power.
  • Not being able to maintain the Rotor Revolutions For each Minute(RRPM) during the ancestry.
  • Flaring or rounding out at the wrong height, either too early or too late.
  • Failing to level out the airplane before touch lower.
  • Whenever flaring, do not do it too aggressively.

Why Can’ t Drone Propellers Auto-Rotate?

To ensure that a quadcopter to be able to rise into the skies, it needs force to become created. This pressure needs to either the same or exceed the force of the law of gravity.

The spinning of the quadcopters propeller blades pushes surroundings downwards. As the propellers push air down to the ground there is an the same but opposite response force(Newtons Third Law).

At these times the air pushes the rotor up and then the drone is lifted up, this force created is called drive. The faster the particular rotor and propellers spin, the greater the lift created. The drones thrust it creates must be more than the weight of the drone in order for it to really take off.

Having a propellers a drone can do 3 things:

Hover Still   In order for the particular drone to hover, the net thrust of the rotors pushing the drone up should be exactly equal to the particular gravitational force tugging it down.

Ascension – This really is done by increasing the amount of thrust created by the drone brake discs so that the upward force is greater than the weight of the drone as well as the pull of the law of gravity. When this happens, the drone starts climbing.

Vertical Descend  – For the drone to come back down, it would require the pilot to carry out the exact opposite of ascension. By lowering the rotor swiftness, so the thrust created by the rotors is reduced.

May a Passenger Drone Auto-Rotate?

Probably the best passenger drone that exists at the moment is the Ehang 184. The Ehang 184 is a fully automatic drone that will transportation its passengers from point A in order to point B with no passenger needing to control anything!

It is truly the next step within human transportation. But , what happens if there is some sort of motor failure? Are these claims passenger drone capable of auto-rotation?

The Ehang 184 is an X-8 multi-rotor drone, and this implies that it has 4 points creating thrust, and each of these points contains 2 motor-propellers. This means that if one of the engines were to fail or die mid-air, the particular drone would not just flip over and arrive crashing down to the floor.

The problem is based on the fact that, like most customer drones on the market, Ehang 184 has a fixed-pitch rotor that has been enhanced for creating thrust due to the heavyweight it needs to transport and it is not designed for auto-rotation.

Passenger drones are still becoming developed and fine-tuning is definitely still being conducted by the companies involved in making these types of drones!

Can a Drone Along with Fixed-Pitch Rotors Auto-rotate?

It is actually almost impossible for a drone without having fixed-pitch rotors to undertake an autorotation landing. But , notice could said nearly! It is possible for a drone to have auto-rotation landing as long as some very specific factors are met:

  • Firstly, you need to have a forward center of gravity or even CG.
  • Secondly, you need to be facing into the wind for it to work.

To meet the center of the law of gravity requirements, you need your own battery to eject itself out of the drone, which would also describe why you lost power in the first place.

When this happens, it fills the requirements needed for the center of gravity condition, and this is required for the proper ahead speed from when you are just hovering.

In terms of wind path, there is literally nothing you can do to control this particular! All you can do can be hope in the event that you will do lose power, you are lucky enough to be dealing with the wind.

If these circumstances are met, then the drone propellers may indeed auto-rotate, and the drone might survive the landing!

Why Aren’ t Presently there More Variable-Pitch Propeller Drones?

Should you do your research or you have read the rest of this post, then you probably possess realized that a variable-pitch propeller system style seems to be superior.

A quadcopter with a low RPM(Revolutions For each Minute) will usually spend less energy upon air drag so the drone will perform more efficiently.

There’ s also the truth that if drones would be to be developed with a variable-pitch rotor, they might be capable of auto-rotation and be able to land safely if the motor were to stop working suddenly or this loses power while in the air.

With the research I’ ve done, There are seen a few quadcopters that have variable-pitch brake discs but they seem to be mainly in the development stage. The main reason why smaller quadcopters and drones don’t have a variable-pitch disc is that this system is extremely complicated.


Basically, the look of a quadcopter or even drone is different from that of a heli-copter, and the main difference is that drones have a fixed-pitch rotor, and helicopters have a variable-pitch rotor. Because of this, drones are unable to auto-rotate whilst in the air in order to land safely if a problem were to occur up.

If your motor were to suddenly cease working in the sky then your drone is most likely dropping like a brick! In terms of battery power, life drones don’ t usually simply fall out of the sky, so you do not have to worry about this happening!

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