Ok, so here I go. Problem Objective: It is simply to create a device to accurately toss a projectile. Constraints: -Must fire a tennis ball anywhere between a 5' to 20' operating range. -Must fitwithin a 2 by 2 footprint(basically when broken down into parts the device does not exceed 2' by 2'). -High pressure gases and combustible materials are not allowed(goodbye fun). -Must be built mostly from scrap and recycled materials. What this launcher has to do is get a tennis ball into a bucket (sitting up) at three points(chosen by my teacher) between 5' to 20'. I am allowed three trials for each of the three points. Anything else done, parameters of course, is up to me. Problem Attempt: Here are my ideas so far. -I am thinking of going for a trebuchet type design. From what I've researched they are plenty accurate but I'm not sure I could break it down small enough parts to fit in a 2' by 2' footprint. From there I've considered everything from a pitching machine to a simple catapult(basically I have made little progress). The calculations involved when it comes to getting the angle and velocity right, I have no problem with. All I'm hoping for are a few ideas from which to build momentum. Thanks in advance guys and please inform me if anything needs to be clarified.