My aerodynamics are second-hand but I believe the factors are:JohnR said:What; if any, was the advantage/disadvantage of using a two bladed rotor?
The specification requirement for cruise speed (level flight airspeed at MCP) was 145 to 175 KTAS. The GCT cruise speed for YAH-64 was 141 KTAS; see Table 3 in the AEFA final report . The YAH- 64 Phase II proposal included some modifications to overcome small performance shortfalls so 145 KTAS seemed possible. The GCT cruise speed for YAH-63 was 122 KTAS; see Table 2 in the AEFA final report . The original YAH-63 Phase II (P2) proposal included no performance modifications. We now anticipated a modified YAH-63 P2 proposal with major changes to overcome such a large performance shortfall. This shortfall was a surprise to the SSEB...
While we continued to work on the YAH-64 evaluation and other YAH-63 performance issues, YAH-63 cruise speed now consumed most of our effort.
I just had to search for Boeing’s AAH entry on Google, and sferrin is right, it is the helicopter equivalent of the X-32. Well and truly ugly.
the thread is good, i like it very informative but the helicopter is not beautiful, true is not that ugly but for an american design it is ugly, the Cobra, Apache comanche and Cheyenne are nice looking, personally i like more the Augusta Mangusta, but it is a nice thread i like it and well still this helicopter is a theme i will look every time they post new pictures like Mirages, F-16 or Sukhois or MiGs thread