A scratch built KMAX rotor design for RC. Very nice work. http://www.modelairplanenews.com/blog/2012/08/21/a-counter-rotating-helicopter
Just found this, the sports cam era is lending us footage that simply never existed before. Very cool footage. The water pump next to the yellow tank is a famous design that includes a Rotax 185 ultralight engine from waaaaaay back in the day. Also this fire was in Oregon right next to Mt. Hood. And that is a typical fire Helibase arrangement, and the mission type depicted here is common for wilderness situations. http://www.youtube.com/watch?v=NrRwvZCy-do&hd=1