The Alpha 40 has a large wing tube and a small one on the RTF version as is designed to use tape to hold the two halves together in case of a need to replace a wing half if needed that is what I was told anyway because I have this plane and there is nothing in the instructions about gluing it also there is nothing in instruction about gluing the tail section because it is bolted together they made this plane like this because I also have the ARF replacement kit and it all has to be glued but not the RTF.

Chris