Elica conica

r = 0.4 (slider from 0 to 5)
h = 0.4 (slider from 0 to 5)
θ2 = 22.4 (slider from 0 to (8 * π))
θ1 = 0 (slider from -25 to 0)
a = CurveCartesian(((r * t) * cos(t)), ((r * t) * sin(t)), (h * t), t, θ1, θ2)