Kilwhang,
Apologies for the spelling error, duly amended. I won't cash the cheque !! AOA, I rather suspect, and always understood, that Albert in the cruise flew with a 3 degree AOA. That being the case, the external tank would offer a larger profile to the RAF (Relative Air Flow) and therefore negate any lift benefits. I know, I'm just an old rigger. Perhaps the Eng from my route lecture might like to put me right.
Smudge
