Lu,
I am reading this and from personal experience know you are in error. For example the Lynx is rigged to accommodate a phase lag of 72 degs and is not too far off, a Squirrel at 78 degs and again does not suffer from too much cross couple. These cross couples will alter with density altitude (I have practical experience of this fact). In fact, with a cyclic pitch input aft it is possible to demonstrate on a cold, high pressure day, to demonstrate a pitch up and roll right whereas at high density altitude a pitch up and roll left. Please explain?
[This message has been edited by Grey Area (edited 15 December 2000).]