Roman crossbow

[Flavivs Aetivs]

I have a few measurements I got from John Conyard of Comitatus, who told me about their superb arcuballista.

There's another late Roman group that made one, I'll let you know the name. Gimme a few minutes to dig up the info.

Off the top of my head though:

From the reconstructions I've seen (on the internet), the Bow is a self-bow (about 120 cm). and the stock is about 60cm long (including the handle). The grove for the bolt is also about 40cm long.

It's likely there was some system of proportioning like the Scorpio. Someone who knows more could tell you more. I've been looking to build one of these for a while now but have neither the time nor money ATM.