Bastl Fishtail Propeller
Sebastien Berger AKA Bastl AKA Nasty Basty is the man who created the bent arm fishtail propeller.
And that's what this tutorial is about. Definitely learn the normal back fishtail propeller a little but this one will definitely mess with your head if you can do the normal propeller really well. It's super useful thou, for a lot of things, and much more efficient and easy to do that the normal one. Not in terms of technique, but in terns of actually energy required.
Youtube Link: http://youtu.be/fbNYkyZ5T_I