Sikorsky X2 coaxial heli developments.

[JohnDixson]

Comanche Vibs/Screens

IFMU:

One of the things re the RAH-66 was the vibration story. I refer to 1/rev and n/rev. Just to be sure I sent a note to the project pilot Rus Stiles and he confirmed that from start to finish, they never made a 1/rev adjustment on the original blades and never had to do anything about the 5/rev. I only flew that machine once with Rus and from hover to Vh ( ~165 KIAS or so ) it was remarkably smooth. It was also amazingly easy to fly. It was.....but I'd better not get started down that road.

I had to send another note back re the screen issue. I recall that they did lose some screens, but I think the instrumentation screens were working fine so they continued. I'll let you know further when Rus gets back.

Rev 1: From Rus Stiles:

All the screens went blank – but, yes we had critical parameters on both the instrumentation and a display driven directly by the flight control computers.

This back up display shared media with the far right screen – when it detected loss of communication from the avionics, it automatically switched over to the flight control computer. It had critical warning/caution messages, air data and performance information.


Rus refers to the two large MFD's in each cockpit. That glitch was fixed and did not recur.



Thanks,
John Dixson