Look at this thread I started in ARF/RTF area.
http://www.rcuniverse.com/forum/Bala...1325240/tm.htm
Here's another thread with a lot of mods for the US40
http://www.rcuniverse.com/forum/m_18.../tm.htm#187623
And here's an in depth build report where they balance one right:
http://www.barnyard-buzzards.com/Bui...r/UltraStick40