absolute velocity calculation
in BFC, tha absolute velocity is computed by STORE(VABS)
but in ground , i coded my own definition VABS= SQRT( UCRT**2 + VCRT**2 + WCRT**2)
i think the built in definition is the same. if i make the contour of the ratio of the 2 definition , it appears surprisingly not equal to 1 but between 0.8 and 1.2 ... i think the difference is very important
where does it come from?? it is the right definition of VABS ? such as coded in the built in option of phoenics?
i made the test on the case B551 ....
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