Quote:
Originally Posted by Fred Brackin
I can only suppose that the "simple trick" that makes it too simple to re-produce is a very dangerous one that would probably make it too dangerous for actual use. It has to be something about temporarily sealing the barrel which makes a potential bomb.
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Well, it's not like blowing up was an unknown failure mode for conventional cannons. I'd lay odds on it being a risk of blowing up, but that might not be why.
Another possibility is to interpret the hashing on the diagram as a wire mesh. That solves the heat transfer rate problems.