I have a project to work on it (quadcopter or "drone") and for that I need to calculate the force that my system {motor+propeller} can provide in order to make the right "basement" mass .. i've searched for some few days and i couldn't really find any software or link that can give me a clue about the way i can calculate it, so i wanted to make a dynamometer by myself and then hook the motor with the the dynamometer and simply conclude the force generated .. yet i've found lately some informations about that. so i thought it could save me some time, and plus i would really know how to calculate the exact force because a dynamometer won't give me this but ll make it as near as possible to the theoretical value.

i've found this guy who nearly asked the same question Calculate quadrotor propeller torque due to aerodynamic drag

after i read his question/comment, i'd find out that he said that he was using the wrong formula, and then he corrected it like this

now i've found the same formula in this link :

http://aerotrash.over-blog.com/article-les-helices-pour-les-nuls-88886705.html

that gives the same last formula . this link was helpful to understand a big part of my question, but what rests is how would i calculate Ct ( lift coefficient ) because in this link, it says that's it's proposional to J (Progress Report) which is given by this formula J = V/n.D which is also propotional to the speed of movement ( speed of flight )

which lead me to another question, if my quadcopter is on ground ( not in the air ) and i want to lift it up, but according to what i just said, the $T = 0 N$ because $Ct$ would be also equals to zero according to these diagrams.

My question is how can i calculate the $Ct$ factor?

I have a project to work on it (quadcopter or "drone") and for that I need to calculate the force that my system {motor+propeller} can provide in order to make the right "basement" mass .. i've searched for some few days and i couldn't really find any software or link that can give me a clue about the way i can calculate it, so i wanted to make a dynamometer by myself and then hook the motor with the the dynamometer and simply conclude the force generated .. yet i've found lately some informations about that. so i thought it could save me some time, and plus i would really know how to calculate the exact force because a dynamometer won't give me this but ll make it as near as possible to the theoretical value.

i've found this guy who nearly asked the same question Calculate quadrotor propeller torque due to aerodynamic drag

after i read his question/comment, i'd find out that he said that he was using the wrong formula, and then he corrected it like this

now i've found the same formula in this link :

http://aerotrash.over-blog.com/article-les-helices-pour-les-nuls-88886705.html

that gives the same last formula . this link was helpful to understand a big part of my question, but what rests is how would i calculate Ct ( lift coefficient ) because in this link, it says that's it's proposional to J (Progress Report) which is given by this formula J = V/n.D which is also propotional to the speed of movement ( speed of flight )

which lead me to another question, if my quadcopter is on ground ( not in the air ) and i want to lift it up, but according to what i just said, the $T = 0 N$ because $Ct$ would be also equals to zero according to these diagrams.

My question is how can i calculate the $Ct$ factor?

I have a project to work on it (quadcopter or "drone") and for that I need to calculate the force that my system {motor+propeller} can provide in order to make the right "basement" mass .. i've searched for some few days and i couldn't really find any software or link that can give me a clue about the way i can calculate it, so i wanted to make a dynamometer by myself and then hook the motor with the the dynamometer and simply conclude the force generated .. yet i've found lately some informations about that. so i thought it could save me some time, and plus i would really know how to calculate the exact force because a dynamometer won't give me this but ll make it as near as possible to the theoretical value.

i've found this guy who nearly asked the same question Calculate quadrotor propeller torque due to aerodynamic drag

after i read his question/comment, i'd find out that he said that he was using the wrong formula, and then he corrected it like this

now i've found the same formula in this link :

http://aerotrash.over-blog.com/article-les-helices-pour-les-nuls-88886705.html

that gives the same last formula . this link was helpful to understand a big part of my question, but what rests is how would i calculate Ct ( lift coefficient ) because in this link, it says that's it's proposional to J (Progress Report) which is given by this formula J = V/n.D which is also propotional to the speed of movement ( speed of flight )

which lead me to another question, if my quadcopter is on ground ( not in the air ) and i want to lift it up, but according to what i just said, the T = 0 N because Ct would be also equals to zero according to these diagrams.

my question is how can i calculate the Ct factor ?

I have a project to work on it (quadcopter or "drone") and for that I need to calculate the force that my system {motor+propeller} can provide in order to make the right "basement" mass .. i've searched for some few days and i couldn't really find any software or link that can give me a clue about the way i can calculate it, so i wanted to make a dynamometer by myself and then hook the motor with the the dynamometer and simply conclude the force generated .. yet i've found lately some informations about that. so i thought it could save me some time, and plus i would really know how to calculate the exact force because a dynamometer won't give me this but ll make it as near as possible to the theoretical value.

i've found this guy who nearly asked the same question Calculate quadrotor propeller torque due to aerodynamic drag

after i read his question/comment, i'd find out that he said that he was using the wrong formula, and then he corrected it like this

now i've found the same formula in this link :

http://aerotrash.over-blog.com/article-les-helices-pour-les-nuls-88886705.html

that gives the same last formula . this link was helpful to understand a big part of my question, but what rests is how would i calculate Ct ( lift coefficient ) because in this link, it says that's it's proposional to J (Progress Report) which is given by this formula J = V/n.D which is also propotional to the speed of movement ( speed of flight )

which lead me to another question, if my quadcopter is on ground ( not in the air ) and i want to lift it up, but according to what i just said, the $T = 0 N$ because $Ct$ would be also equals to zero according to these diagrams.

My question is how can i calculate the $Ct$ factor?