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ZERO LIFT ALPHA calculation

hervesors

hervesors

Messages
92
Country
france
Trying to figure out how FSX calculates ZERO LIFT ALPHA, I performed some calculations from 2 sets of Table 404 data and compared them with the ZERO LIFT ALPHA variable as provided by FS via SimConnect

From first table below, my calculation (by simple interpolation from the 2 points marked in red), I obtained a value of -0.019811 radians that is exactly the value reported by FS
-3.141600 0.000000
-2.748900 0.359900
-2.356200 0.430000
-1.963500 0.299900
-1.570800 0.000000
-1.178100 -0.283500
-0.785400 -0.576500
-0.195500 -1.000000
-0.029700 -0.061600
0.200000 1.369227
0.220000 0.862000
0.240000 0.852000
0.260000 0.842000
0.279300 0.832000
0.288900 0.822000
0.418900 0.731952
0.523600 0.646864
1.570800 0.040000
1.963500 -0.199900
2.356200 -0.300000
2.748900 -0.229900
3.141600 0.000000

However from the other table below (that is a bit more "non linear"), I calculated a value of -0.0317311 while FS reports a value of -0.030612 that is 4% lower, not so much but still significant for subsequent calculations performed from this variable
-3.141600 -0.050000
-2.739480 0.359900
-2.346780 0.500000
-1.954080 0.359900
-1.561380 -0.070000
-0.165080 -1.180000
-0.095300 -0.560000
-0.042940 -0.052000
-0.025480 0.029000
0.009420 0.223050
0.070000 0.550000
0.195000 1.260000
0.210130 1.270000
0.220600 1.220000
0.231950 1.153000
0.245040 1.030000
0.257260 1.000000
0.266860 0.975000
0.283440 0.940000
0.341040 0.900000
0.372450 0.889000
0.393400 0.882000
0.428300 0.871000
0.463210 0.855000
0.550480 0.830000
1.580220 -0.070000
2.365620 -0.310000
3.141600 -0.050000

Does anyone has an explanation for that or knows if FS calculates this variable by another process than a simple interpolation from Table 404 data?
 
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