Do avoid launching towards people, animals ore anything fragile. But if you keep to the power of two AA batteries, there is no real danger of injury. Putting fingers between the fast turning wheels will be painful. Most importantly it is quite spectacular and great fun. The high speed is not the best way to reach distance records, although it does allow children with less tossing skills to reach new personal records. It involves cutting and folding paper, nailing, some ordinary gluing and decorating. If someone with a little experience (or willing to learn) does the soldering and hot melt gluing in advance, the construction and use makes a great childrens activity. In this instructable I explain how to build a battery powered paper plane launcher for less than 5 euro. The Science Museum in London carries kits to make either a paper plane launcher or a Ping-Pong ball canon. As a kid I had toy accelerating matchbox cars on a track in a similar way. You can find the principle in a number of other applications.
As long as there is vertical and longitudinal bottom section at least about 1 cm height, it should work. The device can launch a large range of models.
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