Regarding the following article:
Report: Qantas B734 at Melbourne on Nov 22nd 2011, false takeoff speeds (in a nutshell: after a runway change on short notice, the crew made an intersection takeoff but had calculated speeds for a full length takeoff which were about 20 knots higher): Can takeoff speeds for the same configuration really be that far apart depending on runway length (or is my assumption of "same configuration" flawed)?
Sorry if it's a stupid spam can (and armchair
)flyer question, but if a plane can/should be safely rotated at 149 kts why wait until 171 kts just because there is more runway available? (Or the other way around: if rotation should take place at 171 kts how can it be safely executed at 149 kts?)
Thanks in advance for any elucidation.