Parametrized Helicoid plot becomes a cone + "Arrow=True" is not working for 3-D

General Usage
2

using Plots;
gr()

function helicoid(r)   
    n = 100
    θ = range(-2pi, 2π; length = n)
    u = range(-10, 10; length = n)
    x = r*u*cos.(θ)'
    y = r*u*sin.(θ)'
    z = ones(size(u))*θ'
    return x, y, z
end
my_cg = cgrad([:red,:blue])
surface(helicoid(3),  label="helicoid")
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