Couple of points......
A little bit off topic, but in response to some of the posts;
Bulkheads - on my employers a/c (UK charter), depending on which a/c and location are not necessarily stressed, therefore potentionally offer no forward movement protection.
Brace position..
Being tall there is NO way on a (UK) charter aircraft I can adopt this position (my head stops at the seat infront headrest). On an airline with a bit more legroom (schedule - say 2" more?) I can 'brace', but surely the forward movement in an impact would break my neck?
Often thought about this during the safety demo...perhaps I should get a job that doesn't require flying?
Brgds
OH