[GonzoGOP]

I would love to know how you make the rotor disk of a helicopter stealthy. I'm not saying they can't do it, but as a physics problem it is daunting. A spinning propeller is quite possibly the least stealthy object in the universe. At some point in the cycle it is bound to be at the right angle to bounce a radar wave back at the transmitter. And most radar absorbing materials tend to be heavy, and a rotor blade by its very nature has to be as low mass as possible.

There is so much cool stuff out there that we won't find find out about for a decade or more.

[Sacajaweau]

How long can they “stall” and how far will perpetual motion take them. Is that what happened to the one that was down?? Missed the “cruise” by a couple of seconds??

[dusttoyou]

Would think using something like tail vectored thrust would be more stealthy instead of tail rotor .

[Jack of all Trades]

If you strap a couple of turbofans to the fuselage, you can stop the main rotor in mid flight. See the Sikorsky S-72 X-wing.