Repairing an Aerobird wing with packing tape doesn't really work very well if
there is a crease. It might fly, but at the first real stress, its gonna fold
and you are going to crash.

The tape has no body or stiffness of its own and the folded area of the wing
has had the foam compressed. Net Net, nothing to resist the next fold. If
you open the vinyl and fill the crease with something that is stiff you can
get pretty good results, but it is tricky. I tried building foam from a can
that you use to seal around windows. Works OK, but very messy.

A better solution is to get something thin but stiff, like a strip piece of
wood, but balsa is probably too soft. 1/16th or 1/32 ply, if such a thin ply
exists, or a thin piece of plastic would work. Bond it to the wing with
double sided tape. A 1" wide piece of plexiglass that is thin might work. It
can flex, in fact a bit of flex is good, but it must resist folding. I would
say 8" wide would be the minimum width I would suggest, and I would go 2/3-3/4
the length of the wing, say 25" to 30", as a recommendation. Be sure to
center it left and right so you don't unbalnce the wing. The bird can handle
the weight of a light piece of plastic or wood. I have also seen wood dowels
or carbon rods used. Anything that will resist the folding of the wing.

Attach it to the wing with doublesided carpet tape or something that will bond
it to the wing. Then use packing tape on top of it to smooth out the air
flow. Stretch the tape to create a smooth surface rather than fitting it
tight around the edges of the strip or dowel.

If you look at the Firebird XL wing, it has a carbon rod embedded into it when
you buy it. Other similar planes, like the T-hawk, have these supports in
their wings when they are new.

Give it a try. Don't depend on the tape to keep the crease from folding
again.

I may add a support to my new wings from now on.