Exactly. Just because it conceivably could be done doesnt make it a good idea.I mean… they do look fucking cool when they crank off at 6000rpm though. The rule of cool makes everything a good idea in movies.
Its not the greatest movie but I do love the boat rescue scene from Act of Valor https://youtu.be/O0vZY0m6INU

















Not only that but the barrel is rotating quite fast which encourages cooling.