Go to
http://wildharerc.com/ in the "Downloads" section is a really outstanding article from Tom about "Getting Started in Gassers", and there is a lot of very good information in there. Another benefit is credible information within various forums on RCU and those other places, but not sometimes very easy to sort fact from idiocy.
Many people "test" using gassers, and NEVER buy another drop of nitro fuel again.....
