Back in the days of my control line Flying.We used to use right Rudder and or shim the Engine.To keep Tension on the Lines while doing Wingovers and loops.Theres a Fine Line Between Tension and Drag.R/C does not need this. You still need right rudder But only for takeoff and recovering from a stall.When Engine is Throttled up? I have flown both Full size aircraft and Models.And that was my experience! Hope it helped some? Checkout my Electric Rotowing charlie111 I'm planning on Building a Full Size version that a Small Electric could be Driven into.Something like a Bird cage comb. Roll Bar.The unit would then use the Auto's power supply and be flown by Wire from inside the Vehicle.I would imagine you could get by with a Map,Tom Tom,Altimeter and Airspped to Navigate. And more Practical than trying to fold up wings the size of Glider and the control surfaces.I have a Bad Neck that limits my upper body strength.The Concept works it has been proven.There is a video of a self rotating wing that had no wings.Just 2 squares of paper and balsa I think.And that actually Flew with electric motors turning props at the wingtips.I wish I knew how to get it? Good Luck!