Post #1626276

@lgsp @cstross You give the blade carriage bearings, you make the uprights actual rails and the blade carriage use the kind of multi-wheel interface a modern roller-coaster car does, and you use a pneumatic piston rather than relying on gravity. If you're feeling merciful, you stop using a blade at all and use a linear electric motor or an explosive charge to crush the person-being-executed's entire head at above nerve propagation speeds. 250 m/s would be plenty.