Finally my crop duster is working :-)
there is a short "how to" under:
http://www.rc-network.de/magazin/artikel_10/art_10-039/art_039-01.html
Allthough in german, it should answer some questions.
There is a fairly readable translation under:
http://www.rcuniverse.com/forum/m_1639293/mpage_64/key_/tm.htm
(scroll down a little bit)
Have fun!