Snacko,
I dunno if you have much material on SPECOPS Blackhawks, but I posted some photos to a thread in the aircraft forum that you may want to see. (Why it's still over in aircraft, I dunno...)
Anyhoo, I'm not a rotor head and some of my observations are probably all wrong, (
) but the photos are there for you to interpret for yourself!
http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=3551&SearchTerms=dap
Fade to Black...