I was there (wishing I wasn't)
I put 'c' my self,
If they had put 'wash in/out' I would of gone for that, not to sure about sweep Mad-Jock but you are frightening me with your case,
but even if your wrong (and you may be right) it sounds good bulls#it!
but thinking about it you may well be right as air moving fast outwards from underneath will cause a bending moment
(oh B@@@@llks) where did I put those CAA exam application forms?