I'll throw bsam a bone : I think there should be no limit to the weaponry that you can legally own.
As a matter of fact some luxury yachts are known to have the option of torpedo or not.
Myself I think a modified ZSU-23-4 mounted on deck would be kinda nice
http://en.wikipedia.org/wiki/ZSU-23-4 instead (more effective too).
I guarantee no pirates would screw with you (well not for long).
now if price were no object I'd go for a "vulcan"
I've seen these things fire in the field at night and the tracer rounds look like a red firehose to target
http://www.rtbot.net/M61_Vulcan
As a matter of fact some luxury yachts are known to have the option of torpedo or not.
Myself I think a modified ZSU-23-4 mounted on deck would be kinda nice
http://en.wikipedia.org/wiki/ZSU-23-4 instead (more effective too).
I guarantee no pirates would screw with you (well not for long).
now if price were no object I'd go for a "vulcan"
I've seen these things fire in the field at night and the tracer rounds look like a red firehose to target
http://www.rtbot.net/M61_Vulcan
What an idiot.