r ward

considering the important concept of keeping the control lines taught during flight. as I learned many years ago the lead out should help point the plane away from the circle. so,..as the plane wants to fly away from the circle the lead outs help point it away. all factors,....the belcrank slightly behind the CG and the lead outs positioning the virtual center of the control wires slightly behind the belcrank' s pivot, work to point the plane away from the circle as the control line tension increases. the exact amount is a variable not really established with any concrete factor other than a theoretical approximation of what is minimally required to reliably keep the plane at the ends of the control lines. some amount of this offset is required because of the drag on the lines, which want to turn the plane towards the center of the circle and some of that offset has to be extrapolated into the bow of the lines from drag. the closer this arrangement can be predicted, the smoother the plane will respond to control input. what is given as a suggested arrangement has been established only be trial and error over the many years that large u-control has been flown. the feel of how the plane is pulling on the lines is also a variable and is produced by the combined arrangement of bell crank to CG offset virtual lead out center to belcrank center off set, engine's thrust and rear stabilizer input. everyone has a "feel" they want to recognize as they fly.