I spent some most enjoyable moments with my new scratch built Speed 400 trainer couple of days ago. In fact this was my first successful experience in scratch building...
Equipped with Speed 400 2.33:1 gearbox, 9x6 prop and 8 cell 500AR batterypack it loops from level flight and is _very_ easy to fly.
Check out http://www.careliawin.com/tyson
(Scratches page) for more information.