Easy learning needed

[Noah B]

Hi friends.
I am a high school student that was brought to help teach a class about multirotors at my school.
Unfortunately, I am terrible at speaking and cant get words across very easily which poses a problem in my situation. I was wondering if anybody on this forum knew of a easy multirotor explanation power point, Im not talking about a easy build step by step kinda thing, i am more interested in a explanation of how the wiring works, why it works, and general flight physics. If anybody can help me out here, that would be wonderful.
Thanks!

 

[holtneil]

Hi mate I can give you a basic to work from then you just need to put it into power point
So Noah to start we need the frame so lets go for the 450 flame wheel its a 450 due to the motor to motor centre is 450mm also as its square the frame is stable for the gyro to work on
Now we mount 4 motors ,one on each arm , the pairs of motors turn the same way on the axis across the frame ( so its front left paired with back right, front right with back left ) so now when you look at the quad from on top the 2 front motors turn in towards each other , and the back 2 motors turn away from each other by doing this with the motors this will let the quad balance on all its axis
Then we have the ESC (electronic speed controller ) This does a few things 1- it turns 2 phase DC ( battery Direct current) into 3 phase AC (alternating current) which the motor need to spin( timing) 2- take signal from throttle channel ( from receiver) so the ESC knows how fast to spin the motor. 3- gives out a 5v 5 amp to power the FCB( flight control board) and receiver
FCB this is the heart of the quad it has gyro and accelerometers one for each axis
When you power up the FCB with quad on the floor this will allow all the sensors to lock in to what is level , So now when we take off if the quad goes out of level the gyros will change the speed to the different motors to keep the quad level ( this can be over 2500 times a second depends on processor speed) we can over ride this with the transmitter , So as we tell the quad to say travel forward the transmitter will over ride the control loops of the gyros and not level the quad ( front motors slow, rear speed up this gives us forward flight)
So by controlling the motors speed we can make the quad hover/ turn flat on its axis ( yaw)/roll left or right or backwards or forwards
The height a quad can fly is due to its weight and how much weight can the air support the higher we go the finer the air so less weight it can support so we get to a point where the quad can not climb so it starts to drop but then the props gain lift again so we get a bobbing affect with in a few inches
Thats it really if you have any questions just ask

 

[Noah B]

Thank you so much!