Hi, Ive noticed that that indicated aispeed calucation is wrong when in a

slip/skid etc. The co-sine calculations are applied to the speed and not to

the dynamic pressure that the Pitot tube actually measures. Here you can see

the difference in indicated airspeeds.

```
(A:DYNAMIC PRESSURE, pascal) (>L:DYNAMIC PRESSURE1)
(L:DYNAMIC PRESSURE1) 2 * 1.225 / sqrt 1.943 * (A:INCIDENCE ALPHA, radians) cos (A:INCIDENCE BETA, radians) cos * * (>L:CALC_IAS)
(A:DYNAMIC PRESSURE, pascal) (A:INCIDENCE ALPHA, radians) cos (A:INCIDENCE BETA, radians) cos * * (>L:DYNAMIC PRESSURE2)
(L:DYNAMIC PRESSURE2) 2 * 1.225 / sqrt 1.943 * (>L:CALC_IAS2)
```

Here is the code so you can try yourself. -Tommy