You will find chapter and verse in books or on the internet. The subject of helicopter aerodynamics is far far too large to be answered here, but as I recall it all condenses down somehow to "Big Green Arrows" and "Little Green Arrows"
"Thrust" is a word little used in Helicopter-speak, except in complex descriptions of force-vectors affecting rotor systems and aerodynamics. In such cases it is always attached to other term/s to define it, as in "Forward" thrust "Vector". It's use alone, as you did, is almost meaningless because it is not defined.
Note it's spelling, thrust with an "h", the word you used is totally different, which explains a lot of the posts above.
Happy reading!
ps. Best to get your own knowledge of terminology and language correct before you grizzle at people who do know it correctly...?
Last edited by Agaricus bisporus; 27th July 2009 at 11:07.