I have come up with a awesome idea on how to add strength to the wings and not add much weight at all.

If ya'll have built the 4* 40 then you know the wing will flex.

Now on the TE of the wing, there are two balsa sheets a inch and quarter and inch and a half in width.

This is what to do.

Take scrap balsa, the thickness of the ribs.
Go to the wing tip, and make a pattern from that.
Cut the scrap to match the pattern.
Insert the scrap between each rib on the wing, be carefull NOT to raise the balsa sheeting when you put in the braces.
Cut the scrap so it is flush with the sheeting.
Use thin CA to wick all the way down.
This has made my wing at least twice as strong as what it was before.

I'll try and upload some pic's of this modification later this evening when I get home.

Brian