Hi,
great math and thoughts. Slow rotation should get you higher speed and lower altitudes....not lower speed and lower altitudes.
My thinking is, that winds may have played a role. Didnīt find the report on which the Aviation Week article is based.
Flight Safety foundationsī Aviation Safety Network says:
SKBO 112300Z 35006KT 9000 VCSH SCT015CB SCT070 13/10 A3025 RETSRA RMK CB VCSH LTNG/NW
>> SKBO 120000Z 31004KT 9000 VCSH SCT015CB SCT070 13/10 A3029 RMK CB/VCSH/NW
Takeoff seems to have occurred around 00z .... winds from 310 deg., on rwy 13... makes it a tailwind, right ?
Now, its just a question of how much of that was around. My bet would be that the 04 kt may not have been the full winds at
the specific takeoff run time.
Tailwind and high altitude....oops, that gets you into negative margins fast.