Mig-21-Flight Model - Check six

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Mig-21-FM-Identification-Rev. 14 If we assume that incidence angle is so small that we can also consider Thrust being along horizontal (sin(AoA) = 1.0), formula become: There is also a relation between acceleration and Extra Specific Power (or instantaneous climb rate) (V true air speed in m/s, Ps and Vz in m/s, g = 9.81 m/s 2 ), or that give the global equation system (3.3) Page - 6
Mach Number Mach Number Mach Number Mig-21-FM-Identification-Rev. 14 For each altitude, we can first build the curve: table in fitting the Mach(t) interpolated 1.000 67 0.95 0.900 51.5 0.85 40.5 0.800 0.75 30.5 0.700 0.65 22 0.600 0.55 12.5 0.500 0.45 2 0.400 0.35 0.300 0.200 0.100 0.000 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 Time (s) Extracted Sampled Mach V(TAS) dV/dt Ps Ps m/s (m/s**2) (m/s) (ft/s) 0.40 135 3.22 44 146 0.50 169 3.56 61 202 0.60 203 3.98 82 270 0.70 237 3.38 82 268 0.80 271 3.08 85 278 0.90 305 2.18 68 222 Fig 6.1 (altitude 500m / 1,640ft ; Gross weight 8,000kg / 17,660 lbs ; Drag Index 12) 1.10 82.5 1.05 58.5 1.00 0.95 44.5 0.90 0.85 35 0.80 0.75 26.5 0.70 0.65 17 0.60 0.55 6.5 0.50 0.45 0.40 0.30 0.20 0.10 0.00 0 10 20 30 40 50 60 70 80 90 Time (s) Extracted Sampled Mach V(TAS) dV/dt Ps Ps m/s (m/s**2) (m/s) (ft/s) 0.40 131 2.99 40 131 0.50 164 3.13 52 172 0.60 197 3.46 70 228 0.70 230 3.87 91 297 0.80 263 3.46 93 304 0.90 296 2.35 71 232 1.00 329 1.37 46 150 Fig 6.2 (altitude 3,000m / 9,843ft ; Gross weight 8,000kg / 17,660 lbs ; Drag Index 12) 1.200 129 1.15 73 1.100 1.05 55 1.000 0.95 43 0.900 0.85 33.5 0.800 0.75 24 0.700 0.65 13 0.600 0.55 1 0.500 0.45 0.400 0.300 0.200 0.100 0.000 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 Time (s) Extracted Sampled Mach V(TAS) dV/dt Ps Ps m/s (m/s**2) (m/s) (ft/s) 0.40 128 0.50 160 2.67 44 143 0.60 192 2.91 57 187 0.70 224 3.37 77 253 0.80 256 3.37 88 289 0.90 288 2.67 79 258 1.00 321 1.78 58 191 1.10 353 0.57 21 67 Fig 6.3 (altitude 5,000m / 16,404ft ; Gross weight 8,000kg / 17,660 lbs ; Drag Index 12) Page - 7
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Page 19 and 20: Mach Number Mach Number Mig-21-FM-I
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Mig-21-Flight Model - Check six

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