Right, so I want to ask two questions in one topic, completely unrelated, but here they are anyway:
I'll be going to Heathrow to photograph some plane tomorrow, so I'd really like to know about the visitor's terrace. I have read earlier it's in terminal two. Is that true? How much does it cost? Is the view good? Are there souvenir shops/restaurants/other shops around?
The second one is more technical: I used to notice that some planes seem to have engines that are not perfectly round (seen from the front) but oval. Others don't . (I think the A300 and the B737-400 had oval engines). Especially the really old engine inlets (707 etc.) and the really new ones (777, 747-400) are perfectly round, so was that just some weird trend in the 80s? Does it increase efficiency/decrease noise or is it just not really that important? What exactly is the reason for this and why is it not done anymore?
Thanks for any answers.