FreeCAD
FreeCAD is an excellent parametric 3D CAD program for creating 3D printed components. Open Source and actively supported, this is and ideal tool for learnig about parametric 3D design.
Engineering
Not a lot to see here (yet). Move along now - come on - move along! There will no-doubt be bits and pieces on engineering I've picked up over the years - I was, after all, a Civil Engineer once and finished my full-time career as a research engineer for Rolls-Royce (Power Systems as it is/was and not the cars). I don't intend it to be all hi-falutin' maths but also hacks and DIY tips.
Engineering stuff
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The Severn bridge from about 1500ft en-route from Compton Abbas to Liverpool via the Welsh hills in an RV7 (G-DVMI)
