I'm quite sure that is a model helicopter and by the sound it just might be jet turbine powered.
BTW it is perfectly easy to loop a model helicopter with a teetering head rotor system. You just need lots of speed before entry otherwise you dont make it around before getting a mast bump - which isnt serious as the masts are usually solid steel and they wont break very easily.
I cant think of a real helicopter with the required grunt.
oow