RE: JR 8103 AND NEGATIVE DIFFERENTIAL
No.. I mean negative differential.. On most planes, the aileron is centered within the wing area which means you get just as much surface throw equally, up or down. Now, with the Composite-Arf setup, the hinge is actually incorporated into the top of the wing/aileron itself which off-sets the throw. When you make the aileron trave up, everything is okay. Now, with down travel, the aileron actually sucks into the wing area which ultimately provides less aileron surface. The instructions say to set the differential at negative 10%. What this does is allow the downword aileron to add another 10% of travel which compensates for the lesser surface area that's sucked into the wing. Does that make sense?