Dominic considered what it would take to make the tubes quickly and efficiently.
A handle mounted to a tube with a hole in the side, where a rough rotating striker could slide along the side of the loaded mortar, would do the job. He wouldn't even try to enclose it, just teach the teams how to load them safely with the striker moved out of the way.
These weapons would be insanely dangerous, not only to their enemies, but possibly to the users as well. But the men were intelligent, they would figure it out soon enough.
Plus, this version could be kept loaded.
Take it out of storage, aim and fire, then drop it back into your storage cube or reload it.
The simpler the design, the better.
Dominic finished the design, then made a cutting template out of the copper sheeting he already had. It would cut the clay like a cookie cutter, and then he just needed to bend it to shape and assemble the launchers.
