# Car construction

Thread Starter

#### Furkanyildiz

Joined Jan 13, 2023
14
Hello, if I connect 4 wheels to this drone, will it move like a car ?

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#### atferrari

Joined Jan 6, 2004
4,746
Your problem would be the software controlling those wheels. It will behave quite differently from what you seem yo expect.

Thread Starter

#### Furkanyildiz

Joined Jan 13, 2023
14
Your problem would be the software controlling those wheels. It will behave quite differently from what you seem yo expect.
[/ALINTI]
If I attach 4 wheels to this circuit, what could be the problems and how can I fix the problems that may occur?

#### Tonyr1084

Joined Sep 24, 2015
7,756
Those motors spin at high rates of speed. The "Power" they produce is proportional to the diameter of the props and the amount of air they move. Two prop motors spin clockwise and the other two spin counterclockwise (anti-clockwise). You'd have a car that wants to go in two different directions VERY fast. But given the "Power" available, the weight of spinning those tires along with moving the craft will likely over tax the motors and cause them to burn out.

To get the motors all spinning in the same direction you'd have to rewire two of them (reverse their polarity by cutting and splicing the wires back opposite of what they were originally wired). It's doable but impractical. And likely going to waste the motors. They're designed for high speed, not high power or torque. Wheels are torque based whereas props are RPM based (among other things).

Thread Starter

#### Furkanyildiz

Joined Jan 13, 2023
14
Those motors spin at high rates of speed. The "Power" they produce is proportional to the diameter of the props and the amount of air they move. Two prop motors spin clockwise and the other two spin counterclockwise (anti-clockwise). You'd have a car that wants to go in two different directions VERY fast. But given the "Power" available, the weight of spinning those tires along with moving the craft will likely over tax the motors and cause them to burn out.

To get the motors all spinning in the same direction you'd have to rewire two of them (reverse their polarity by cutting and splicing the wires back opposite of what they were originally wired). It's doable but impractical. And likely going to waste the motors. They're designed for high speed, not high power or torque. Wheels are torque based whereas props are RPM based (among other things).
Thanks for the answer. Can I use this circuit in a different way?

#### Audioguru again

Joined Oct 21, 2019
6,604
Those coreless motors are VERY cheap with brushes that wear out and burn out soon.
My RC model airplanes use brushless outrunner motors that are small, light and powerful. They last forever.

#### schmitt trigger

Joined Jul 12, 2010
836
Thanks for the answer. Can I use this circuit in a different way?
The problem is not an electrical one, but rather a mechanical one as explained previously.
But nobody is stopping you from experimenting with the device you have got. If you attach tiny diameter wheels to the motors to solve the high-RPM, low torque characteristics, perhaps it could work.
Go ahead, show us.

#### Audioguru again

Joined Oct 21, 2019
6,604
Make the drone look like a car and let it fly.

#### atferrari

Joined Jan 6, 2004
4,746
@Furkanyildiz

Have ever noted how the propellers spin in a drone?

For starters, wheels will run always in one direction, thus not all in the same sense (albeit, at variable speeds). Just imagine what even a single mobile thing like that would do.

You should reconsider your intention and design a very basic car that could, at least, move back and forward.

Rewriting from scratch the code of a drone? More

Last edited:

#### Ian0

Joined Aug 7, 2020
9,434
Those motors spin at high rates of speed. The "Power" they produce is proportional to the diameter of the props and the amount of air they move. Two prop motors spin clockwise and the other two spin counterclockwise (anti-clockwise). You'd have a car that wants to go in two different directions VERY fast. But given the "Power" available, the weight of spinning those tires along with moving the craft will likely over tax the motors and cause them to burn out.

To get the motors all spinning in the same direction you'd have to rewire two of them (reverse their polarity by cutting and splicing the wires back opposite of what they were originally wired). It's doable but impractical. And likely going to waste the motors. They're designed for high speed, not high power or torque. Wheels are torque based whereas props are RPM based (among other things).
A car has two wheels that rotate clockwise and two that rotate anticlockwise.

#### KeithWalker

Joined Jul 10, 2017
3,017
Those motors spin at high rates of speed. The "Power" they produce is proportional to the diameter of the props and the amount of air they move. Two prop motors spin clockwise and the other two spin counterclockwise (anti-clockwise). You'd have a car that wants to go in two different directions VERY fast. But given the "Power" available, the weight of spinning those tires along with moving the craft will likely over tax the motors and cause them to burn out.

To get the motors all spinning in the same direction you'd have to rewire two of them (reverse their polarity by cutting and splicing the wires back opposite of what they were originally wired). It's doable but impractical. And likely going to waste the motors. They're designed for high speed, not high power or torque. Wheels are torque based whereas props are RPM based (among other things).
If the four motors use reduction gears to drive wheels, and they are mounted in a four-wheel drive chassis, They will perform quite well but you would have no reverse. You don't need to re-wire the motors. You WILL need the left wheels to rotate in the opposite direction to the right wheels when going forward, or it would just go round in circles.

#### Audioguru again

Joined Oct 21, 2019
6,604
RC model airplanes that use those cheap coreless motors use gears to drive the much larger propellers than drones use. Then the drone motors do not need gears.

#### Tonyr1084

Joined Sep 24, 2015
7,756
A car has two wheels that rotate clockwise and two that rotate anticlockwise.
Depends on your perspective. Looking at a car from the right hand side - the rear wheels rolling forward rotate clockwise. So do the front wheels. If you look at a car from the left hand side - the rear wheels rolling forward are rotating counter-clockwise. So are the front wheels. If you stand inside the car and look at the wheels; left side rolling forward they rotate clockwise. Turn around and change your perspective, looking at the right wheels, the car is rolling forward the wheels rotate counter clockwise. It all depends on perspective.

Now that this has been pointed out - yes, two motors spinning clockwise with the motors mounted inboard of the wheels will spin clockwise while the other two wheels, mounted inboard of the wheels will spin counter clockwise. So I have to admit - @Ian0 - you are correct. No need to rewire the motors.

#### shortbus

Joined Sep 30, 2009
10,044
Why even think he wants to drive the wheels with the motors? A 4 or 3 wheel chassis was made and the motors and blades mounted parallel to the ground, not like the drone but blowing horizontally, the airflow could be used to move a "car". Like an air boat with wheels.

#### MisterBill2

Joined Jan 23, 2018
17,736
Certainly if you had an adequate reduction scheme so that the motors could drive the four wheels at a speed that will be reasonable for a model car, and if all four wheels were allowed to swivel like castors, then it could drive on the ground and be steerable. But it will not steer like a car, but sort of like a tracked vehicle.But there will be no stopping it because vertical lift aircraft do not stop the blades while in flight.
The speed reduction for the wheels driven from the motors will be about 250 to one. (250::1), which is a really serious reduction ratio.

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