# BALLOON
m_pl = 417.57  # payload mass in [kg]
m_film = 7.74  # mass balloon film in [kg]
m_gas = 5 * 74.98539754298822  # 1.60391061452  # lifting gas mass in [kg]
V_design = 334705  # maximum fillable balloon volume in [m^3]
L_goreDesign = 1.914 * V_design ** (1/3)

# THERMO-OPTICAL
alpha_VIS = 0.024
r_VIS = 0.06
tau_VIS = 0.916
epsilon = 0.1
alpha_IR = 0.1
tau_IR = 0.86
r_IR = 0.04

c_f = 2092  # [J/(kg*K)]

epsilon_ground = 0.9
Albedo = 0.1
T_ground = 273.15

# DRAG
c_d = 0.47       # drag coefficient balloon (spherical) [-]

c_virt = 0.37

# SIMULATION
t_end = 10000  #5000  # maximum simulation time in [s]
dt = 0.01  #0.01  # simulation time step in [s]
start_height = 0.0  # start altitude in [m]
start_lat = 39.9161  # start latitude in [deg]
start_lon = 9.6889  # start longitude in [deg]
start_utc = '2006-01-16 08:00:00.000'  # start date and time in UTC
p_0 = 101325  # sea-level pressure