I have a couple of USN / USMC helicopters in the painting stage, ready for MiG Alley rescue missions over war torn Korea, but have been struggling to devise a way to represent the spinning rotor blades. I thought of cutting out discs of thin plastic or bubble packaging then drawing on the blurred outline of the blades but this seemed a bit too crude and would probably look pants. However, I have now found a source of laser cut thin plastic rotor blades for 1/600th scale aircraft, including both tail rotors and main rotor blade discs. I’ll go ahead and order a couple in different sizes, if I can work out the ones I need, to see what they’re actually like, although they look pretty effective in the photo above.