People who have seen my blog before may remember a project I did last year. It was called the blue sky project where we had to come up with a driving question and mine was could you build a hovercraft out of supplies found in a home or hardware store. The answer was a yes I built a working human sized rideable hovercraft and documented it with a video. This time I will be doing the same thing but with a different driving question. Can you build a ballista out of supplies found at home or the hardware store. They are quite similar and yet so different. I will have to make the ballista big enough that it’s strong enough to fire a sizeable projectile. But that’s not it I have to also make it accurate enough to hit a moving glider. This one will require much more calculations for the strength and tension, the length to the cocking lever and more. So far I have come up with a general design nothing to in depth but a draft for the general project. This will be in my opinion quite a bit more challenging considering how much more math goes into it and just having to measure and make all the correct pieces fit together. Below is my rough rough draft.