We have been back in the shop working on the prototype number 2 aircraft getting it ready for the EAA air venture show in Oshkosh Wisconsin. We wanted to be able to show the dope and fabric version of the aircraft at the show as well as the ultralight version. In this picture here are starting to finish up the wing tip are

The inboard rib has to create a box structure so that all of the dope and fabric will have a location to attached to while the wings are in the folded position.
All of the ribs on the aircraft are manufactured from .5 ×.035 wall thickness 6061 T6 aluminum tube. the inboard box structure will be riveted to the top and bottom ribs. Each one of the ribs will also have 1/8 inch holes spaced approximately every 4 inches to be used for fabric attachment to the structure.
The top and bottom sections of the inboard wing box structure are curved by using a crimping tool to shrink the flange and strategic locations forming the exact shape of the airfoil.
The wingtip trailing edge rib installed in place using a 1/8 inch aluminum pop rivets.
The new completed wingtip.
