Rotorheads is the time honored and acceptable term.
Jesus Nuts works as well from the Huey days. The Jesus Nut is what sits at the top of the shaft and holds all of the working parts together. "Jesus" being the only one who can help you if it comes off! Don't know if newer rotor designs have moved away from this but it is the design in the Huey and it's sister the Cobra.
Helicopters are the new Cavalry of the air so COSSACKS might also be appropriate.
â€œThere is no problem which cannot be solved by the proper application of high explosive!"