Tuesday, December 25, 2012
In setting up the wing panel receiver tubes, I set the cores on the working surface with the top surface down shimmed up .125" on each half at the root. This to allow a slight amont of dihedral eliminating the possibility of anhedral in the wing while in flight. Once everything is lined up equally, the tubes were then tacked in with 5 min epoxy.
Sub-root former placement is now traced onto the cores to allow .250" engagement of the tube end.
Foam is removed, the former temporarily put in place and traced to the airfoil shape top and bottom for final sanding. Excess air space will be filled with foam and final sanded to shape with the former. Formers get lightly epoxied in place.
This view shows the receiver tube dihedral offset.
Friday, December 21, 2012
Thursday, December 20, 2012
Sub-root formers are roughed out. They will be traced to the core airfoil than shaped to fit. They consist of .125" spruce ply and .250" balsa laminent. End of receiver tube has .350" deep interference fit. Next step - tack the receiver tubes into the foam cores with proper dihedral. I'm figuring a 1/2 degree.