Here's a video of the first flight of a pulse jet rocket. That's a bit of an oxymoron since it's not rocket powered. WTH, it looks like a rocket to me. I've seen lots of videos on home made pulse jets, but I didn't realize they could be built light enough for vertical flight. This one used propane as its fuel. If you view the video on YouTube, you can find parts #1 and #2, which document the development of the engine. Looks like it would be easy to damage yourself and burn up you launch site with these things. I wouldn't fiddle with them but still think this is pretty darned cool.