Aircraft Sizing Problems

I am currently in the the mid section of an Airbus UK design project at university with a lot of deadlines in the next week and little time.

I’m working on Op’s/Performance and I was wondering if any of you had information on Loop 1, 2, 3… etc “rubber engine aircraft” sizing. Does anyone here have any book references, software, information, websites etc for post-parametric sizing methods – they need to be free – especially stuff on mission profile analysis.

What would be very helpful is a worked example of a detailed breguet/coffin range analysis of step cruises, climb and decent profiles etc. I’m currently working with Raymer’s stuff which is proving to be a bit limited in mission analysis. I need to build an iterative flight performance model of an aircraft in the conceptul stage.

Any help would be appreciated.
Cheers