Comment Re:The reason it crashed too? (Score 1) 484
I wonder if perhaps the noise reduction and stealth features came at a price of reduced performance.
Any helicopter can enter a state known as settling with power or vortex ring state. Basically the rotors downwash is recirculated around and back through the rotor. When operating close to high walls, a vortex ring can form very suddenly, and the pilot may not have sufficient room to recover.
Here's a link describing the condition.
http://www.cybercom.net/~copters/aero/settling.html
Not necessarily a limitation of any modifications, just a general limitation of helicopters.
I knew that helicopter ground school would come in useful eventually!