@ Enkei . . . your "Oh, one minor niggle: not just increase drag. Decreasing lift also works, does it not?" . . . is covered in lesson three.
By then you are (just) on your way to 1st solo (hopefully,) when you will become an authority on >all< things aeronautical.
(Said in jest, but highly recommended to all frustrated drivers. Doesn't cost too much, gets it out of your system, and you can read stuff like this with a measure of understanding and sympathy.)
That said, it still concerns me that the bottom-line FWSOV seems now to be an optional (functional) extra. In my (ancient) day(s) it was the fundamental bottom line. 'When all else fails . . .'
[YOU! Old grub! Shuffle your a*se to the rear row. NOW!
SaH!)