I would just like to say in the defence of "bad spellers"...
Although I agree that every effort should be made to spell properly (I reckon SMS and online messaging has a lot to answer for) some people cannot get it no matter how hard they try. I know several intelligent and competent people who really struggle with their spelling and have suffered prejudice throughout their lives (school and adult) along with the lack of confidence, frustration and embarrassment that this often induces.
Oh yeah, and spell checkers don't always work either - many misspelled words are actually other words spelled correctly so they don't show up. No what I mean?
Anyway, helicopters...