I cutted a slot of 3mm wide for the main spar.
Now i will apply baking paper on the bottom and secure it with packong tape which also will keep the gap tight.
Now the baking paper is in place i will use construction glue to fill the gap.
Be sure to apply enough glue on the innerside of the depron so the wooden spar is well glued to the depron.
The spar is now in place and i added some weights to keep the wing flat.
As you can see the spar is not complete covered with glue. This is not a problem because the glue will expand and it will be tight on the bottom. When the glue is hardened i will finish of the top with hotglue…