This has been bothering me for a while...
When I look at pictures taken out over the wing of a 747, I cant help but notice the outer engines appear to be toe-ed in slightly.
I think it can be seen quite clearly on this picture:
Photos: Boeing 747-422 Aircraft Pictures | Airliners.net
Is it just a trick of the eye or are the outer engines in fact angled inwards?
I am unable to find anything on here or google about this subject, and with no definate figures, I wouldnt dare to estimate the angle and work it out - but I would have thought the outer engines at full power must create quite a significant crushing force on the pylons or wing-roots.
If anyone could shed any light on this subject it'd be great to hear the reasoning - or it'd be nice to put my mind at ease if it is just my eyes playing tricks on me.