GOSH !!! I love it when Nick starts with the explanation of all the angles of the dangles....and the thrusts of the hinges....but really appreciate the concept of the Brand X rotor system being simple...must be why I keep finding myself herding them around the sky.....matches my intellectual abilities to the rotor system ! That or the 0330 get up this morning with only Decaf in the rig chowhall got me ! Did you guys ever update that lovely little blue book that Sikorsky used to produce on aerodyamics for helicopters ? Wish I could find mine...but it got lost in one of the 157 moves I made while following my helicopter career.