I am writing a fictional adventure novel with elements of flight. I have questions about aviation and I need the advice to get it close to right while still being entertaining in my novel. Questions like, can a plane the size of a 747 or C 17 Globemaster physically perform a loop or barrel roll? It's an ongoing process and there is an end in sight, but still a year maybe two in the future. I was wondering may I ask more questions as time goes by, and which section of forums should I ask them in?