Try this site

http://www.rcgroups.com/links/index.php?id=3497

I helped a student with one of these last year. He added one foot to the length of the bag and used a GWS flight pack for power. It needed nearly 6 oz of balast to keep it down.


I would also suggest a more simple controls system. Rigidly mount the motor and prop and have a rudder and elevator in the prop wash