Originally Posted by
DaveReidUK
I believe rotation was at approximately the 05:38:47 datapoint (certainly before the next point at 05:38:50).
OK so it is not until 17 or 20 secs later that you reckon the VS figures begin to read true? And given the airfield elevation 7625' you are deducting how many feet for the QNH1029 correction to convert the 1013hPa 8or 1013.25hPa or 29.92inHg as you will) ADS-B figures to AAL?
1050' AAL (8150' ADS-B altitude) was achieved by 05:39:50.
That implies you may have converted thus: 8150'-7625'+525'=1050'. Are you using 1029-1013.25=15.75 and 15.75hPa x 33.3'/hPa=525'? Because I would use 1029-1013.25=15.75 and 15.75hPa x 27.3'/hPa=430' and conclude that at the 05:39:50 datapoint ET302 was around 950' some odd AAL, but then I may have it all wrong if I am to adjust the rate up from 27.3 to 33.3 because we are well above sea level - if so, I missed it at school
