youness fouqani
New Member
Hi there !
I am trying to build my own quadcopter from A to Z. I mean I will build everything myself except for the engines.
So far, by using newton laws, I got these equations :
(notice : I am totally neglecting air drag but not sure if that right at quad speed range).
By plugging these equations into an arduino, we could control each engine force (Fe) , then converting that force into required RPM ??
1. reach a vertical speed :
Fe = m/4((v-v0)/t) + g)
m: quad mass
v : actual speed
v0 : velocity to reach
t : time to reach v0
2. Hover
Fe = 1/4 * (m . g)
g : gravity
3. Displacement
Fe = 0.25 * (m/sin(O)) *((v-v0)/t + g)
where O = tan-1(( ((v-v0)/t) + g) / ((v-vs)/t2 + g) )
v : actual speed
v0 : vertical velocity to reach
vs : speed to reach
t : time to reach v0
t2 : time to reach vs
O : angle of tilt
I have the following questions :
Is these equations right ?
Could I control engines without ESC ?
Should I neglect air drag ?
How to convert Fe to RPM based on engine and props specs ?
thanks for reading and replying.
I am trying to build my own quadcopter from A to Z. I mean I will build everything myself except for the engines.
So far, by using newton laws, I got these equations :
(notice : I am totally neglecting air drag but not sure if that right at quad speed range).
By plugging these equations into an arduino, we could control each engine force (Fe) , then converting that force into required RPM ??
1. reach a vertical speed :
Fe = m/4((v-v0)/t) + g)
m: quad mass
v : actual speed
v0 : velocity to reach
t : time to reach v0
2. Hover
Fe = 1/4 * (m . g)
g : gravity
3. Displacement
Fe = 0.25 * (m/sin(O)) *((v-v0)/t + g)
where O = tan-1(( ((v-v0)/t) + g) / ((v-vs)/t2 + g) )
v : actual speed
v0 : vertical velocity to reach
vs : speed to reach
t : time to reach v0
t2 : time to reach vs
O : angle of tilt
I have the following questions :
Is these equations right ?
Could I control engines without ESC ?
Should I neglect air drag ?
How to convert Fe to RPM based on engine and props specs ?
thanks for reading and replying.