Originally Posted by
SplineDrive
When a helicopter known to have weight problems goes through a significant design change, it's a fair bet that the change either reduces weight or improves the conversion of power to thrust or both. In the case of changing a canted fan-in-tail configuration to a canted open tail rotor, you'll get lower weight, lower disk loading, and probably lower drag.
Are you saying the 360 has known weight problems or are you talking about the change to the RAH-66's empennage during development?