Three or Four bladed maybe. I wouldn't recommend the RADS system for the 206 though. I think their system has some issues. I spent 3 hours over two days last weekend dealing with "Rainman" (a tenth at a time) trying to get one of our L-4s sorted. It wasn't the first time either. If anyone else was willing to let us test one of their systems, we'd probably buy it. (We run the AS350, 407. and 206)