"Allison in the V22 and the PT6 variant in the 609 ... LTC1K-4K variant of the T53 (XV-15) and the T800 (US-2) ... vertical-capable."
I'm suprised they haven't got a 3 or 4 engine version on the drawing board, to push up payload. This would also help with the eng-failure during transition problem, which i imagine could be a real problem with low speed low level work over unfriendly territory.
There is going to be some good competition once Sikorsky aim their coaxial development towards V-22 performance figures. A lot of research will be needed to get the rotors to be as efficient as a fixed wing at speed though, requiring active twist and variable RPM. Much better in hover efficiency though.
Mart
Last edited by Graviman; 14th Jul 2005 at 19:45.