Hello , i am new and currently working on my end course projet which is my first FPV.
 
Okay here is my setup: I am working with a MatekF405-STD flight controller  and the my ESC are "[b]cyclone 45A 2-6s BLHeli[/b]", a " RADIOLINK R8EF" receiver and a "Radiolink T8FB" transmitter, i also have the "AIR gear 2213/kv920"  motors with somme 9.5" propellers.
The fpv is about 1.9kg and 17.7"/12.5"

When it's armed the motor are spinning correctly and and i can adjust the motors speed at will.But it is not taking off at all and makes a lot of noise (like really a lot).I first thought it was a betaflight configuration (I am using a Dshot600 protocol by the way) issue so i desabled AIRMODE and try a different PID configuration but i had the same result.

I am really confused because i can not figure out what's the issue here.

Can you guys please help me out?

(sorry for my poor english by the way, i'm not used to it).

What kind of battery are you flying it on?

Have a look at the motor test sheet in images for this listing: https://www.getfpv.com/tiger-motor-air-g...-escs.html

Based on the motor test sheet in that listing, at 4s voltage each motor can only produce 1.084 kg of thrust at 100% throttle.

If the rig’s all up weight including lipo is 1.9kg, I am assuming that you are using a 4s lipo, then you are at a 2:1 thrust to weight ratio at 100% throttle.

You should plan for atleast a 2:1 thrust to weight ratio to allow your drone to hover at just half or 50% throttle.

You will need even more thrust to make the quad maneuverable.

Have you looked at eCalc to work out if your quadcopter configuration makes sense:
https://www.ecalc.ch/xcoptercalc_mobile.php

(15-Jun-2021, 12:54 PM)kafie1980 Wrote: What kind of battery are you flying it on?

Have a look at the motor test sheet in images for this listing: https://www.getfpv.com/tiger-motor-air-g...-escs.html

Based on the motor test sheet in that listing, at 4s voltage each motor can only produce 1.084 kg of thrust at 100% throttle.

If the rig’s all up weight including lipo is 1.9kg, I am assuming that you are using a 4s lipo, then you are at a 2:1 thrust to weight ratio at 100% throttle.

You should plan for atleast a 2:1 thrust to weight ratio to allow your drone to hover at just half or 50% throttle.

You will need even more thrust to make the quad maneuverable.

Have you looked at eCalc to work out if your quadcopter configuration makes sense:
https://www.ecalc.ch/xcoptercalc_mobile.php

Hello sir, i am using a 3s 3000mAH lipo, i just tried the calculator but i can not find the same componant ,espécially the ESC parameters.

You can try and follow this video on using eCalc:



Just from working the numbers in my head, with all things setup correctly I doubt the bird can take off on 3s voltage as it is unable to produce the required thrust looking at the motor test sheet:

(16-Jun-2021, 03:52 AM)kafie1980 Wrote: You can try and follow this video on using eCalc:



Just from working the numbers in my head, with all things setup correctly I doubt the bird can take off on 3s voltage as it is unable to produce the required thrust looking at the motor test sheet:

Hi sir, after some tests it seems like i have to change the lipo and even the motors in order to be safe about it. Looks like i can take a 4s 6000mAh 45c lipo at least and switch to some 2814/16 kv1000 motors to raise the trust/weight ratio to 2.5:1 in order to be able to fly smoothly (i guess). 

Now i have a more precise idea about the direction i have to take.

Thank you for the precious help Sir.

Might be dumb, but are you 100 percent sure your props are on correctly and the motors are spinning in the correct direction? I’ve seen lots of pilots put props on wrong or forget to set the motor direction when setting up a new quad.

(06-Jul-2021, 11:43 PM)clone2002 Wrote: Might be dumb, but are you 100 percent sure your props are on correctly and the motors are spinning in the correct direction? I’ve seen lots of pilots put props on wrong or forget to set the motor direction when setting up a new quad.

on a 9inch blade, incorrect motor or blade direction would be pretty expensive, that shouldnt be his issue