#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # # Aircraft: # # ASW 20 # # File # asw20-v1-nl-uiuc # # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # # Authors: # # Michael Selig # http://www.uiuc.edu/~m-selig # # 2002/05/27 Initial workup # 2002/11/03 Many more refinements # 2002/11/08 Refinements before first release # 2003/06/08 More updates. See README.asw20.html for details. # # #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # # References: # # - Johnson, R.H., "A Flight Test Evaluation of the ASW 20," # Soaring Magazine, May 1978 # # - aero data from various sources and methods # # - Additional models and updates # http://www.aae.uiuc.edu/m-selig/apasim.html # #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # # Notes: # # Performace specs: # - Max L/D 41.7 @ approx 60 kts and 759 lbs w/ flaps at -6 deg # (flaps are not yet modeled) # # Todo items: # [] obtain control deflection limits for ASW 20, using ASW 27 for now. # [] include water ballast # [] change moments of inertia w/ water ballast # [] add in ground effect # [x] model flaps [/] flaps to raise/drop # [x] add in spoilers j/k spoilers to close/open # [x] include air sounds # [] include nonlinear Cn_beta for high side slip # [] stick to elevator throw is likely nonlinear, unlike what I have now # [] update included drag due to rudder deflection, aileron deflection, and side slip. #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # various "init" FGFS settings init use_V_rel_wind_2U init use_dyn_on_speed_curve1 init dyn_on_speed 2 init dyn_on_speed_zero 1 init use_Alpha_dot_on_speed 7 # [ft/sec] speed below which Alpha_dot is set to zero init use_gamma_horiz_on_speed 15 # [ft/sec] speed above which Gamma_horiz_deg is used in chase view [1] # downwash terms init downwashMode 100 init downwashCoef 0.0114 # [1/ft] see asw20 notes 021026 p 1 # geometry geometry bw 49.2 # [ft] [x] see asw20 notes 021011 geometry cbar 2.297 # [ft] [x] see asw20 notes 021011 geometry Sw 113 # [ft^2] [x] see asw20 notes 021011 # estimates for now, based partly on ASW 27 maintenance manual controlSurface de 25 22 # [deg] max/min: 22 deg (nose up), -20 (nose down) controlSurface da 25 25 # [deg] controlSurface dr 31 31 # [deg] controlSurface flap_max 40 # [deg] max flap deflection, positive down controlSurface flap_rate 10 # [deg/sec] rate of flap deflection movement once commanded to move controlSurface spoiler_max 90 # [deg] max spoiler deflection (vertical) controlSurface spoiler_rate 30 # [deg/sec] rate of spoiler deflection movement once commanded to move # mass and moment of inertia data mass Weight 728.736 # [lb] [x] see asw20 notes 021011 mass I_xx 950.478 # [slug-ft^2] [x] see asw20 notes 021011 mass I_yy 396.277 # [slug-ft^2] [x] see asw20 notes 021011 mass I_zz 1295.657 # [slug-ft^2] [x] see asw20 notes 021011 mass I_xz 0 # [slug-ft^2] [x] see asw20 notes 021011 # Apparent mass terms mass Mass_appMass_ratio 0.230 # [x] see asw20 notes 021011 mass I_xx_appMass_ratio 0.103 # [x] see asw20 notes 021011 mass I_yy_appMass_ratio 0.014 # [x] see asw20 notes 021011 # simulates tow plane line tension for aero tows engine simpleSingle 110 # [lb] # simulates spoilers on throttle #engine simpleSingle -100 # [lb] # for getting up in a hurry (unrealistic of course) #engine simpleSingle 780 # [lb] ###################### # Longitudinal terms # ###################### # Lift curve # wing and fuse CL for +-180 deg CL CLfa CLfa-01.dat 0 1 # CL CL_adot 0.347 # [/rad] [x] asw20 notes 021026 p 3 (see spreadsheet) CL CL_q 4.337 # [/rad] [x] asw20 notes 021026 p 1 (see spreadsheet) CL CL_de 0.195 # [/rad] [x] asw20 notes 021026 p 1 (see spreadsheet) CL CL_df 0.20 # [ ] lift due to flaps # parasite drag polar from +-180 deg for wing and tail CD CDfa CDfa-01.dat 0 1 # # base parasite drag coef CD CDo 0.0125 # [] placeholder ........ CD CD_de 0.0002 # [] placeholder ........ CD CD_dr 0.0004 # [] placeholder ........ CD CD_da 0.0003 # [] placeholder ........ CD CD_beta 0.0150 # [] placeholder ........ # Induced drag #CD CDK 0.0149 # [-] [x] asw20 notes 021026 p 3 (see spreadsheet) CD CDK 0.0152 # [-] [x] asw20 notes 021026 p 3 (see spreadsheet) # [x] includes all CL^2 components (approx), including profile CL^2 drag CD CLK .1 # offset in parabolic drag polar CD CD_ds .025 # [ ] spoiler drag # wing/fuse moment curve from +-180 deg Cm Cmfa Cmfa-01.dat 0 1 # [-] [x] Cmarc Cm Cmfade Cmfade-01.dat 0 1 1 # [-] [x] see spreadsheet Cm Cm_q -24.098 # [/rad] [x] asw20 notes 021026 p 1 (see spreadsheet) Cm Cm_adot -1.928 # [/rad] [x] asw20 notes 021026 p 1 (see spreadsheet) ########################### # Lateral Direction terms # ########################### # rudder dr terms CY CY_dr 0.158 # [/rad] [x] see asw20 notes 021026 p 4 (see spreadsheet) Cl Cl_dr 0.0065 # [/rad] [x] see asw20 notes 021026 p 4 (see spreadsheet) Cn Cn_dr -0.041 # [/rad] [x] see asw20 notes 021026 p 4 (see spreadsheet) # yaw rate r terms CY CY_r 0.164 # [/rad] [x] see asw20 notes 021026 p 4 (see spreadsheet) Cl Cl_r 0.1551 # [/rad] [x] Cmarc result, see asw20 notes 021030 p 3 (see spreadsheet) # [x] 0.0068 from vert fin, see asw20 notes 021026 p 4 (see spreadsheet) Cn Cn_r -0.05389 # [/rad] [x] Cmarc result, see asw20 notes 021030 p 2 (see spreadsheet) # [x] -.042 from vert fin, see asw20 notes 021026 p 4 (see spreadsheet) # beta terms CY CY_beta -0.316 # [/rad] [] Cmarc contribution # [x] -.316 vert fin contribution Cl Cl_beta -0.0693 # [/rad] [x] see asw20 notes 021030 p 4 Cn Cn_beta 0.1007 # [/rad] [x] -.0045 Cmarc contribution, see asw20 notes 021030 p 4 # [x] 0.082 vert fin contribution # Net is 0.0775, but this does not seem to provide # enough damping. Assume that the fuse produces # some Cn_beta (30%) --> 0.1007 # aileron da terms CY CY_da -.0456 # [/rad] [] placeholder Cl Cl_da -0.214 # [/rad] [] placeholder, see asw20 notes 021026 p 5 Cn Cn_da -0.017 # [/rad] [] placeholder # roll rate p terms #CY CY_p -0.2 # [/rad] Cl Cl_p -0.6843 # [/rad] [x] see asw20 notes 021030 p 1 Cn Cn_p -0.08591 # [/rad] [x] see asw20 notes 021030 p 1 # nose wheel (must be position 0 if present) gear Dx_gear 0 3.2 # x-offset from CG [ft] gear Dy_gear 0 0 # y-offset from CG [ft] gear Dz_gear 0 2.2 # z-offset from CG [ft] gear cgear 0 350 # damping [lbs/ft/sec] gear kgear 0 700 # springiness [lbs/ft] gear muGear 0 0.01 # rolling coefficient gear strutLength 0 -.5 # gear travel [ft] (not yet used) # right gear (must be position 1 if present) gear Dx_gear 1 0.2 # [ft] gear Dy_gear 1 0.05 # [ft] gear Dz_gear 1 3.10 # [ft] gear cgear 1 200 # [lbs/ft/sec] gear kgear 1 400 # [lbs/ft] gear muGear 1 0.01 # rolling coefficient gear strutLength 1 -.5 # gear travel [ft] (not yet used) # left gear (must be position 2 if present) gear Dx_gear 2 0.2 # [ft] gear Dy_gear 2 -0.05 # [ft] gear Dz_gear 2 3.10 # [ft] gear cgear 2 200 # [lbs/ft/sec] gear kgear 2 400 # [lbs/ft] gear muGear 2 0.01 # rolling coefficient gear strutLength 2 -.5 # gear travel [ft] (not yet used) # right wing gear Dx_gear 3 0 # [ft] gear Dy_gear 3 26 # [ft] gear Dz_gear 3 -1.7 # [ft] gear cgear 3 150 # [lbs/ft/sec] gear kgear 3 300 # [lbs/ft] gear muGear 3 0.01 # rolling coefficient gear strutLength 3 -.5 # gear travel [ft] (not yet used) # left wing gear Dx_gear 4 0 # [ft] gear Dy_gear 4 -26 # [ft] gear Dz_gear 4 -1.7 # [ft] gear cgear 4 150 # [lbs/ft/sec] gear kgear 4 300 # [lbs/ft] gear muGear 4 0.02 # rolling coefficient gear strutLength 4 -.5 # gear travel [ft] (not yet used) # tail gear Dx_gear 5 -10 # [ft] gear Dy_gear 5 0 # [ft] gear Dz_gear 5 1.3 # [ft] gear cgear 5 400 # [lbs/ft/sec] gear kgear 5 800 # [lbs/ft] gear muGear 5 0.02 # rolling coefficient gear strutLength 5 -.5 # gear travel [ft] (not yet used) # ahead gear Dx_gear 6 5 # [ft] gear Dy_gear 6 0 # [ft] gear Dz_gear 6 2.6 # [ft] gear cgear 6 25 # [lbs/ft/sec] gear kgear 6 50 # [lbs/ft] gear muGear 6 0.0 # rolling coefficient gear strutLength 6 -.5 # gear travel [ft] (not yet used) # way ahead gear Dx_gear 7 10 # [ft] gear Dy_gear 7 0 # [ft] gear Dz_gear 7 0.3 # [ft] gear cgear 7 25 # [lbs/ft/sec] gear kgear 7 50 # [lbs/ft] gear muGear 7 0.0 # rolling coefficient gear strutLength 7 -.5 # gear travel [ft] (not yet used) *