Time (s) <strong>Mig</strong>-<strong>21</strong>-FM-Identification-Rev. 14 180 165 150 135 120 105 3,281 9,843 16,404 22,966 RL 1,000m RL 3,000m RL 5,000m RL 7,000m Level <strong>Flight</strong> Acceleration 90 75 60 45 30 15 0 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60 Mach Fig.14 Page - 24
Mach Number <strong>Mig</strong>-<strong>21</strong>-FM-Identification-Rev. 14 Special After Burner Thrust Law identification. The Special regime is available from sea-level to 4,000m (13,123 ft), and L-17 Performance manual give Level flight acceleration schedule at 1000 and 3000m, and Sustained Load Factor at 1,000, 2,000 and 3,000m. I shall start by defining Thrust curve at 3,000m (thrust in lbs for each mach number value) using level flight acceleration schedule, then do the same with manual figure related to 1,000m. Altitude of 3,000m / 9,843ft 1.300 74 1.25 1.200 55 1.15 1.100 43 1.05 33 1.000 0.95 26 0.900 0.85 19 0.800 0.75 12 0.700 0.65 5 0.600 0.55 0.500 0.400 0.300 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 Time (s) Extracted Sampled Mach V(TAS) dV/dt Ps Ps Thrust m/s (m/s**2) (m/s) (ft/s) (lbs) 0.50 164 4.11 69 226 10,811 0.60 197 4.69 94 309 11,114 0.70 230 4.69 110 361 11,124 0.80 263 4.69 126 413 13,284 0.90 296 4.69 141 464 14,576 1.00 329 3.29 110 361 16,387 1.10 361 2.74 101 331 18,266 1.20 394 1.73 70 228 18,266 At this altitude, one can note that there is no significant difference between “maximum after burner” and “Special Regime” for mach number lower than 0.9. Altitude of 1,000m / 3,281ft Page - 25