I get so pissed off when someone answers a question, answers it accurately and obviously knows what hes talking about, and still
someone contradicts them, even though they don't even really understand the question!
I think this thread effectively demonstrates your point about mis-information that is allowed to stand will evenually become fact in some people's minds.
I noted Airmale's comments above;
Wasnt this a test carried out by UA to see if the 744s performance was affected minus the winglet, I believe they were surprised to note no change
And my mind was sent racing back to this thread.
In particualr Iainhol's comments, quoting "research," and a "United mechanic"
Almost a year on this mis-information re-emerges here from someone else!