i got an ebook and made a catapult and had a lot of fun with it. i hope some time in the future i can make a bigger version though. I also hope some of you can have fun with any of them and if you have kids it can be great fun. there are a lot of different kinds and it also has information about the catapults themselves, not just how to build them. HOPE U HAVE FUN

Where did you get the ebook ?

I've had a look and can't see any obvious publishing info or copyright notices.
But you'd probably be best not to post ebooks on the forum in future.

Someone's gone to a lot of effort to produce this and unless you can prove that's it's genuinely public domain then you shouldn't post it on the forum.

I've removed it until we can verify that it's genuinly public domain.
What website did you get it from ?

And just to prove I'm really a nice person I've even resized your pic for you
When posting to the forum - try and get it somewhere between 800x600 and 1024x768

lol - yeah the guy sells the book on the website for $27.95
Definitely not a freebie.

No worries - it happens, but we do try and observe copyright round here. Something of a rarity these days - so just be careful what you post

ps: I do like your onagar.

i was going to try to make a trebuchet but my dad wont let me unless i use the instructions on the ebook, which are only tabletop. i want to make one at least as big as me

you know what else would be cool to make? a ballistae 

ive made a ballistae before, a hand version reaaly, i made it because i wanted to shoot arrow darts but grew tired of trying to make bows and crossbows, it worked really good or some time until one of the limbs broke and it was trown to the garbage by my mother.

its like making two opposed cataputs whose's limbs are conected to each other end. and there you go, ballistae