Tons of Fun!
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This is one dads and boys will get a kick out of together. The text is easy and enjoyable (even for mom) to read. Whether you are using it for science or history (making sort-of replicas or understanding the technology of certain periods) or for your budding engineer, you will find this a great place to start.
If you are an advanced ballistician (or whatever you call yourselves), check this out at the library first - it really is a beginner's book. Also, redstoneprojects.com has a nice selection of working replica and/or tabletop model catapults from different historical eras if you're more interested in authenticity.
Depending on the kids' ages, you will probably want to be sure they understand these are not projects to do alone in their spare time but rather with an adult present (yes, dad counts). Our son is permitted to work on parts gathering & building on his own but knows "ground zero" is a family affair. Your kids might be different - read it yourself first, and you'll see what I mean.
Yes, it's dangerous (you can tell by the title & cover art) - but so is life! Have fun!