Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>Mig</strong>-<strong>21</strong>-FM-Identification-Rev. 14<br />
Level <strong>Flight</strong> Acceleration tables.<br />
The flight model identification start by level flight acceleration analysis, because it allows to define<br />
the relation between the engine thrust law (installed thrust) and the null lift drag coefficient (even at<br />
low speed, level flight acceleration involve low incidence profile where drag is very close to null lift<br />
drag)<br />
The acceleration performance are given in the L-15 Manual by graphics, one page per altitude, where<br />
curves give the time needed to reach a given Indicated Air Speed (in Km/h) form an initial one. The<br />
curves display the variation of this time depending on the Drag Index, the solid one is related to<br />
standard atmosphere (ISA), the dotted one to ISA+10°C.<br />
Let’s start by the figures extracted from L-15 flight manual for Full A/B at 500m (1,640 ft).<br />
m<br />
ft<br />
Alt 500 1640<br />
Full A/B<br />
Vcas Vcas<br />
(Km/h) (Kts)<br />
Mach t-isa (s) t+10 (s)<br />
400 <strong>21</strong>6 0.336 0.00 0.00<br />
450 243 0.378 5.20 5.50<br />
500 270 0.420 9.50 10.50<br />
550 297 0.461 13.50 15.00<br />
600 324 0.503 18.00 19.50<br />
650 351 0.545 <strong>21</strong>.50 23.00<br />
700 378 0.587 25.50 27.50<br />
750 405 0.629 28.50 31.50<br />
800 432 0.671 32.50 35.00<br />
850 459 0.713 36.50 39.00<br />
900 486 0.755 41.00 43.00<br />
950 513 0.797 45.00 48.00<br />
1000 540 0.839 50.00 53.50<br />
1050 567 0.881 56.00 65.00<br />
Then the one related to 3,000m (9,843 ft).<br />
Figure 1<br />
m<br />
ft<br />
Alt 3000 9843<br />
Full A/B<br />
Vcas Vcas<br />
(Km/h) (Kts)<br />
Mach t-isa (s) t+10 (s)<br />
400 <strong>21</strong>6 0.39 0.0 0.0<br />
450 243 0.44 5.3 5.6<br />
500 270 0.49 10.9 11.7<br />
550 297 0.54 15.7 17.0<br />
600 324 0.59 20.7 22.0<br />
650 351 0.63 25.3 26.9<br />
700 378 0.68 29.2 30.9<br />
750 405 0.73 33.3 35.2<br />
800 432 0.78 37.7 40.4<br />
850 459 0.83 42.4 45.4<br />
900 486 0.87 47.0 50.8<br />
950 513 0.92 52.7 56.9<br />
1000 540 0.97 64.6 73.3<br />
1050 567 1.02 75.0 75.0<br />
Figure 2<br />
The one related to 5,000m (16,404 ft).<br />
Figure 3<br />
m<br />
ft<br />
Alt 5,000 16,404<br />
Full A/B<br />
Vcas Vcas<br />
(Km/h) (Kts)<br />
Mach t-isa (s) t+10 (s)<br />
400 <strong>21</strong>6 0.442 0 0<br />
450 243 0.497 7 9<br />
500 270 0.548 13 14<br />
550 297 0.600 18 20<br />
600 324 0.651 24 26<br />
650 351 0.702 29 30<br />
700 378 0.754 34 36<br />
750 405 0.805 39 41<br />
800 432 0.856 43 46<br />
850 459 0.908 48 51<br />
900 486 0.959 56 60<br />
950 513 1.013 65 69<br />
1000 540 1.071 79 90<br />
1050 567 1.127 115 150<br />
Page - 4
Change language