Haha, yeah i'm glad i'm not a mechanical engineer!
Although in saying that, all my dimensions at work are in um/nm and everything down to fF (10^-15). Mind bogglingly small stuff. And we're the 'large scale' power guys!
Anyway, thanks for the replies, i have another question!
In class D airspace below 3000ft AMSL, <140knots IAS:
5km visibility, clear of cloud and surface in sight...
Is that 5km clear of cloud? Or just 'clear of cloud' with the 5km referring to visibility?
Thanks!