import numpy as np
import atmospheric_model as atmos

M = 400
D = 0.1
alpha = np.radians(40)
g = 9.81
a = 30*g
alt = 5000
v = 600

N = M*a
S_ref = np.pi * (D/2)**2
Q = atmos.dynamic_pressure(alt, v)

C_N = N/(Q*S_ref)
C_N_alpha = C_N/alpha

print(C_N_alpha)