Comparing outlines. Traced outlines of the 2013 KTM 990 and 2021 Husqvarna 901 reveal a striking similar shape. The appeal of this rally profile is undeniable, whether from Austria or Sweden. But wait....aren't KTM and Husqvarna the same company? Yes. Two key lines. The most important lines on a modern motorcycle are these. The rake of the two red lines create muscularity and defines the "rally bike" look (i.e., Dakar Rally). These angles are timeless and universally appealin

What are cracks and fractures? What are hydraulic fractures? For this post, I have prepared a bunch of figures that explain cracks (fractures) and crack propagation from a Geologist's perspective. It will not be an exhaustive treatment of the subject by any means, but it will cover natural fluid-driven tensile fractures in sediments and rocks (i.e., clastic dikes). My goal is to review the pertinent parts of Fracture Mechanics using a set of new illustrations, brief discussio