Sounds like a bunch of us in the SCA back in the 70s. We figured that with the "ballista from hell" (a design someone came up with to use leaf springs from ancient boxcars that was never built) we'd be able to throw solid steel "bolts" six feet long for *miles. Emplaced on top of the tallest building in Portland, it'd have been possible to try nailing police cars to the pavement by implaing them thru the engine block. <eg>
no subject