@mace_rb There was ( is? ) a very neat mod for Kerbal Space Program of all things, which analysed the shape of your vehicle using voxels in order to calculate wave drag, along with prroviding some half decent aerodynamics ( and some analysis tools that probably did more for my understanding of fluid dynamics than a year at uni ). I think that was done in something like 2015, too. I was rather expecting something similar here, I can't believe they're really basically giving you a tube - what is there for wings? anything at all?