- #1
Russell_B
- 15
- 0
Hi all,
I'm having trouble with the power required formula for steady level flight.
Here's the formula:
Preq = 4/3*W*sqrt(W/S*2/ρ*sqrt(3*CD0/(π*ε*A)))
I'm using this for a small indoor RC fixed wing. The values I'm using are as follows:
Weight, W = 0.3924N
Wing Area, S = 0.073 m^2
Density, ρ = 1.226 kg/m^3
Zero lift drag, CD0 = 0.03
Span efficiency, ε = 0.9
Aspect Ratio, A = 15
These values are giving me a power required of 0.051 W, which is almost exactly 1000 times less than what I know the electric motor uses, since it holds SLF at half throttle and the max power rating for the motor is 100W.
Where am I going wrong? I know I've gotten my units mixed up but I can't work out where. Help!
:/
I'm having trouble with the power required formula for steady level flight.
Here's the formula:
Preq = 4/3*W*sqrt(W/S*2/ρ*sqrt(3*CD0/(π*ε*A)))
I'm using this for a small indoor RC fixed wing. The values I'm using are as follows:
Weight, W = 0.3924N
Wing Area, S = 0.073 m^2
Density, ρ = 1.226 kg/m^3
Zero lift drag, CD0 = 0.03
Span efficiency, ε = 0.9
Aspect Ratio, A = 15
These values are giving me a power required of 0.051 W, which is almost exactly 1000 times less than what I know the electric motor uses, since it holds SLF at half throttle and the max power rating for the motor is 100W.
Where am I going wrong? I know I've gotten my units mixed up but I can't work out where. Help!
:/