quadrotor constant calculation..

Nasha

Nasha

New Member
Hi there,
i am totally new to RC, but i am interested in building a quadrotor for a research purpose and i have started reading related papers and articles and started to work on it, on my way, i found few problem when i was to calculate the quadrotor constants, upto now i have calculated the inertial moment but i need to calculate the thrust constant (k) and the drag constant (b) of a BLDC motor of 980kV , 0.55A/10V no load current, 11.1V lipo. can any one please explain me how to calculate this constants.
 
GJH105775

GJH105775

Off and on
Moderator
Nasha said:
Hi there,
i am totally new to RC, but i am interested in building a quadrotor for a research purpose and i have started reading related papers and articles and started to work on it, on my way, i found few problem when i was to calculate the quadrotor constants, upto now i have calculated the inertial moment but i need to calculate the thrust constant (k) and the drag constant (b) of a BLDC motor of 980kV , 0.55A/10V no load current, 11.1V lipo. can any one please explain me how to calculate this constants.
Click to expand...
Is english a second language for you? Can you try to reword that last sentence?
 
GJH105775

GJH105775

Off and on
Moderator
Nasha said:
yes, sorry about my english.
i need to find thrust constant and the drag constant. are there any equations for this ?
Click to expand...


Not that I know of for quadcopters as the drag depends in the frame's shape and style. I imagine that you could find out the drag using a traditional equation(D = Cd * A * .5 * r * V^2) provided you are able to calculate the reference area of whichever frame you are using.
 
Nasha

Nasha

New Member
tha
GJH105775 said:
Not that I know of for quadcopters as the drag depends in the frame's shape and style. I imagine that you could find out the drag using a traditional equation(D = Cd * A * .5 * r * V^2) provided you are able to calculate the reference area of whichever frame you are using.
Click to expand...
Thank you !!!
 
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