Instant Müsli (with milk powder), tour food, freshly waxed hiking boots, and beautiful sunshine! Ready for an overnight Bymarka tur.
The last few days (with almost continuous rain outside), I was looking into open source software for airplane design again. It has been a while since I designed my last flying wing with XFoil and AVL, and WOW how things moved forward! With XFLR5 there is now a comfortable environment which integrates most of the functionality XFoil and AVL offer. It also includes really nice post-processing and visualisation.
As I want to try the CNC router at the FIX Maker Space for cutting foam cores of wings, I needed a way to interface XFLR5 with CAD/CAM. Sadly it does not support direct export to any common file format. But I sat down yesterday night and wrote a translator from XFLR5 wing format to ASCII STL files: XFLR5-STL@github
Now I can import the generated STL file in MeshLab, FreeCAD, PyCAM, or OpenSCAM for the next steps towards CNC routed foam cores
Let’s see how that works out!
Adding a new power supply and a spare hard drive, I installed Proxmox, an open source virtualisation platform. It allows you to create and manage virtual machines via a convenient web interface. After setting everything up with the practical USB-stick installer, I removed the unneeded graphics card to conserve energy. With the default frequency governor ‘ondemand’, the CPU usually throttles down to 1.6GHz and the systems just draws about 50W without load. Using lm-sensors and fancontrol, I configured the CPU-fan to just run when needed, so the system is usually rather quiet.