Mart,
Dave, that web page is getting interesting! Have you got the rest of that XH-59 document?
Yes. The page on Posting #303 is from 'An ABC Status Report'
These are the Technical Documents that I have;
Technical Documents on S-69 (XH-59) ABC:
Technical Documents on X2 TD ABC:
On this subject of Rotor Shaft Angle, this section has been added to
the X2TD web page.
Dave