U-joints are simply awesome! Why? They allow rotational forces to be transmitted around corners. U-joints, Rezeppa-joints, Double Cardan-joints, and CV-joints all allow your driveshafts and axleshafts ...
Perhaps a hundred different types of couplings can join rotating drives when there is just a small misalignment between shafts (3°). But designs with misalignments approaching 10° or more leave just ...