30 vs 25 Flap.
@777Fly.
I do not question your response to DC-ATE. or agree with his post. but simply ask...
What is the purpose of the 30 position IF it adds "negligible" lift yet adds considerable drag.
Surely the "negligible" must be closer to "significant" i.e. worth having or otherwise what is the point of such a setting?
I do not wish to rekindle the discussion re whether the crew should or should not have reduced the flap setting (I'm not interested and do not believe that at this point it has any relevance) but just question the premise against which the discussion is based, namely that 25 to 30 is "purely drag".
I am not a pilot. nor an aerodynamic specialist, but as an engineer I find it surprising that a function/position has been provided that increases drag but not lift...unless of course its purpose is as a brake, which may be the case.
So another way. What is the thinking/purpose in selecting 30 vs 25 under normal circumstances other than procedure calsl for it.
Please enlighten us.