Well, I don't have a clue about the Alpha 40, however for me the Generic fix would be to saw the glued joint apart. Using the belt sander, I would sand the previously joined ends smooth. Then I would determine if -- using the end airfoil for a pattern -- I should cut a rib/ribs to fill in the new joint and reglue. Once the reglue job is done I would use clamps to hold in place. Never trust tape on any rather flat joint.

One glue trick I use with carpenter's glue and/or slow epoxy is to leave a couple or more spots available for slow CA. Have everything ready to set up, apply the regular glue, and then the slow CA in the spots. Get it together and squirt accelerator along the edge of the CA spots. In a minute or less, everything is secured in place. Clamp and leave to dry.