Just search for "pig launchers". Then, after you understand the basics, maybe you'll have intelligent questions. I hope you're not a "pipeline engineer".
Here's one way to launch a pig. Maybe you mean a slower launched pig. Maybe you want a pig that is intended to be launched. I know, you want that great historic pig launch and retrieval for the sake of the glorious people. This one includes great music so there are lots of notes in a minor key.
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"Don't disturb my circles." translation of Archimedes last words
I am proud to say , the Americans have never come close to matching our great technological lead in the field of pork flight. Or in our field of potato.
Летающие свиньи, летающие свиньи, никто не может победить родины, да здравствует великий и доброжелательный отец стали
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... get yourself a pair of cheap sunglasses
I would be tempted to use a big air cannon like one of those pumpkin chucker contest guys use. I suspect the note at that point will be a pretty low thump followed by a very high pitched squeal!
For receiving the high velocity pig I would probably go with either a large net or try and skip it across a pond until it lost its momentum then retrieve it with a boat.
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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