Hi John,
the key to understanding things like Transverse Flow Effect is to have a good understanding of 'prerequisite' topics such as Induced Flow and Gyroscopic Precession. You can read up on all of these at Paul Cantrell's website at...
http://www.copters.com/helicopter.html
and specifically on TFE at...
http://www.copters.com/aero/transverse.html
This webpage is excellent if you haven't gotten round to buying any texts yet (and excellent if you have!).
And just when you get your head around that, you may find there's more (or less) to Gyroscopic Precession than meets the eye. But that's another kettle of fish...
Best of luck!
Irlandés