# Jeff Scott
# DHC-6 Twin Otter
# small twin turboprop engine commuter aircraft
# This model was developed by Devesh Pokhariyal of the Smart Icing 
# Systems Aerodynamics group (Prof. Michael Bragg, head) at the 
# University of Illinois.  The aircraft data is from:
#       Pokhariyal, Devesh and Merret, Jason.  FDC flight simulator
#         Twin Otter input file (version5_bat), 5/23/00.
# 05-23-2000    file creation

geometry bw   65.0      # [ft]
geometry cbar  6.5      # [ft]
geometry Sw  420.0      # [ft^2]

controlSurface de 20 20 # [deg]       guess for now
controlSurface da 20 20 # [deg]       guess for now
controlSurface dr 20 20 # [deg]       guess for now

#controlSurface set_Long_trim_deg -3.0
#controlSurface elevator_input Aircraft-uiuc/TwinOtter/deft.dat 1 0 700

mass Weight  10141      # [lb]
mass I_xx    16039.3    # [slug-ft^2]
mass I_yy    22841.6    # [slug-ft^2]
mass I_zz    35807.4    # [slug-ft^2]
mass I_xz     1102.8    # [slug-ft^2]


# aircraft specs: 2 engines of 462 kW each
#                             ~2000 lb static thrust each
engine simpleSingle 2000  # [lb]


CL CZo      -0.360      # []
CL CZ_a     -5.660      # [/rad]
#CL CZ_a2     0.0        # [/rad]
#CL CZ_a3     0.0        # [/rad]
CL CZ_q    -19.97       # [/rad]
CL CZ_de    -0.608      # [/rad]
#CL CZ_deb2   0.0        # [/rad]
#CL CZ_df     0.0        # [/rad]
#CL CZ_adf    0.0        # [/rad]

CD CXo      -0.0488     # []
CD CX_a      0.223      # [/rad]
CD CX_a2     1.659      # [/rad]
#CD CX_a3     0.0        # [/rad]
#CD CX_q      0.0        # [/rad]
#CD CX_de     0.0        # [/rad]
#CD CX_dr     0.0        # [/rad]
#CD CX_df     0.0        # [/rad]
#CD CX_adf    0.0        # [/rad]

Cm Cmo       0.040      # []
Cm Cm_a     -1.310      # [/rad]
#Cm Cm_a2     0.0        # [/rad]
Cm Cm_q    -34.2        # [/rad]
Cm Cm_de    -1.740      # [/rad]
#Cm Cm_b2     0.0        # [/rad]
#Cm Cm_r      0.0        # [/rad]
#Cm Cm_df     0.0        # [/rad]

#CY CYo       0.0        # []
CY CY_beta  -0.6        # [/rad]
CY CY_p     -0.2        # [/rad]
CY CY_r      0.4        # [/rad]
#CY CY_da     0.0        # [/rad]
CY CY_dr     0.15       # [/rad]
#CY CY_dra    0.0        # [/rad]
#CY CY_bdot   0.0       # [/rad]

#Cl Clo       0.0       # []
Cl Cl_beta  -0.08       # [/rad]
Cl Cl_p     -0.5        # [/rad]
Cl Cl_r      0.06       # [/rad]
Cl Cl_da    -0.15       # [/rad]
Cl Cl_dr     0.015      # [/rad]
#Cl Cl_daa    0.0        # [/rad]

#Cn Cno       0.0        # [/rad]
Cn Cn_beta   0.1        # [/rad]
Cn Cn_p     -0.06       # [/rad]
Cn Cn_r     -0.18       # [/rad]
Cn Cn_da    -0.001      # [/rad]
Cn Cn_dr    -0.125      # [/rad]
#Cn Cn_q      0.0        # [/rad]
#Cn Cn_b3     0.0        # [/rad]