So I have several designs drawn up for these weapons, including a straight ballista, a more traditional looking ballista, and a catapault. All these designs, however, use surgical tubing to provide the force for propultion, and they have parts that move very fast, and pinch points as well. So, I have several questions:
1) Although it is anachronistic, is surgical tubing OK as a means of propultion? If not, what else could I use. I know they used rope in the olden days, but that seems very very difficult to me.
2)Is there any way to build it without pinch points? How dangerous is too dangerous? With such a light projectile, the arm has to move very very fast to make it go anywhere, and the arm will probably end up being about 4 feet long or so. That is dangerous, but would it be acceptible?
3) My idea for the boulder is to take one of those round pillows with the stretchy exterior that are stuffed with the tiny styrofoam pellets and to stuff some more open-cell foam into them through the little zippered slot they have. Hopefully, that will make it heavy and big enough to pass and fly. How big does it need to be again to pass? How heavy can it be?
Thanks
Tim