Just wanted to say all those models look superb! But I do have one complaint about one of the Helicoptors. One of the new ones with the single ring bugs me. Its actually a really good model, and the design is unique, but I don't think it would work well in real life.
If I remember correctly from some shows I watched in the past, part of the complexity of a chopper is that its blade system is designed to keep the helicoptor from spining round n around. The aft stabilizer helps in this, but its the design of the chopper blades that minimizes this aswell. I may be wrong on this, but the single ring design might present a problem here. Just wanted to let you know.
That is why I was so impressed with the 2 ring design. I can just tell that the 2 ring design is really simple and straight forward, and you wouldn't have to worry about the chopper rotating around n around. Heck, it might even help make it a faster helicoptor with the 2 rings. Much less drag with the chopper blades not so exposed. Clearly, that 2 ring design is just begging for it to be an attack helicoptor.
I would stick with the thurst/vector stabilizer. From what I saw of the military show that discribed it, the system for it was incredibly simple. Its actually linked to the turbo fans of the blade engine that shoots exhaust to the aft stablizer... hardly any moving parts except to aim the thrust. Why the military rejected the idea is beyond me...