G-SP0T
29th Sep 2005, 20:16
just wondering what method people use for the "interpolation" of fuel figs in flt planning.
Eg if a ac suffers a 4% penalty for every 4000ft below it optimum, and 10% penalty at 8000ft, what would the penalty be at 5200ft below???
iv been trying to factor each one in a table eg
below by / penatly
4000 ...... 4
5000 ...... 6.5
5250 ...... 6.63
5500 ...... 6.75
6000 ...... 7
8000 ...... 10
but im not getting an accurate enough answer, is this the wrong method or just poor exicution of the correct one? any help would be appreciated.
Eg if a ac suffers a 4% penalty for every 4000ft below it optimum, and 10% penalty at 8000ft, what would the penalty be at 5200ft below???
iv been trying to factor each one in a table eg
below by / penatly
4000 ...... 4
5000 ...... 6.5
5250 ...... 6.63
5500 ...... 6.75
6000 ...... 7
8000 ...... 10
but im not getting an accurate enough answer, is this the wrong method or just poor exicution of the correct one? any help would be appreciated.