with winglets
Same Weight=65,000 KG LONG RANGE CRUISE
FL 370=1162
FL 350=1166 Kg/hr/eng
FL 330=1180
FL 290=1186
1000NM
FL 310=4900
FL 330=4700
FL 350=4600
FL 370=4500
did a double check for the 1000NM and that is what the book shows. fuel higher for the winglets but the times are shorter!
without winglets 1000 nm
FL 290=4700KG 2:45
FL 310=4600KG 2:42
FL 330=4400KG 2:37
FL 350=4300KG 2:32
with winglets 1000 nm
FL 290=5100KG 2:38
FL 310=4900KG 2:33
FL 330=4700KG 2:28
FL 350=4600KG 2:24
i must admit that i get bored very quickly doing these type of activities. perhaps later i will look into the subject further. but that is what the QRH book gives for the winglets and wingletless aircraft at ryanair.
anyhow, with a new flight crew notice that requires us to maintain at least a 1.45G manuever margin, we are always at least 2000 feet lower than usual. so the fuel savings forecast by the winglet sales department is seldom approached.
but regardless of fuel factors-- they do look good and we all know how important good looks are!
Last edited by stator vane; 10th September 2006 at 11:58.