CRAN,
This may be the patent that you are looking for;
The International Publication Number is WO0126966
CIRCULATION CONTROL SLOTS IN HELICOPTER YAW CONTROL SYSTEM
Publication date: 2001-04-19
Inventor(s): NAMIS NCARON (CZ)
Applicant(s): NAMIS & NCARON (CZ)
Application Number: WO2000CZ00074 20001011
Priority Number(s): CZ19990003595 19991012
IPC Classification: B64C27/82
It can be obtained from The European Patent Office.
http://ep.espacenet.com/
__________
As for my project; it's both fun
and frustration.
Dave J.