A picture may convey a thousand words but a video can sometimes do a lot more than that. Below is a collection of videos which I hope will be of some informative value to you.
Please be aware, we use the Ogg Theora video codec here. It is as efficient as DivX and is not encumbered by patents or licence fees. If you don't have a copy of the CODEC yet, then you can try the following sources;
Shaping the trailing edge on a QFII wing using a razor plane
This short video demonstrates how to razor-plane down the trailing edge on a balsa built up wing. Notice how the width of the wood curl becomes larger as the trailing edge comes to being finished.