wing extension and stall properties!

[xterarc]

Well the title is not exactly clear but here is my question...
when covering a wing structure with basla ie. all built up wing, you can extend lets say 1-3cm both upper and lower skins so that they form a near flat profile extending the trailing edge. Would a little bit of this "extension" be beneficial, but adding lets say 2cm increase turbulence and stall tendency? OR no extension should added at all. :confused: :confused: :confused:
My experience with a 30" warbird-designed by Ryan showed a stable bird using ~1cm extension
Thanks for all your inputs
PS apologise for the lack of any proper terminology guys :)

[Work in Progress]

You're increasing the wing area, thus decreasing the wing loading slightly, so stall speed may go down slightly. But the reduction in aspect ratio is likely to reduce overall efficiency. Drag at high angles of attack will increase.

A lot depends on the angle for the combined continuation of the trailing edge. If it droops, it will have a flap effect if it tilts up it will have a negative flap effect. If it follows the mean chord line, depending on the main airfoil that you are modifying, it is likely to de-camber the wing slightly.
On a small 30" span electric model I doubt you will notice much effect to be honest.

[BMatthews]

If you bevel the lower sheeting and extend the upper sheeting only you end up with a little flap off the trailing edge. This not only makes the wing area larger but also increases the camber. But it also increases the wing's angle of incidence compared to the stabilizer so if you leave it on then you'll need more down trim later on.

The proper way to do it is to bevel one of the sheets so that it blends with the opposite surface of the rib and the second sheet can then glue nicely and smoothly to the rib and the bevel of the first sheet. When cut off even with the end of the bevel you're left with a trailing edge that is the same thickness as the one sheet. That's the typical and proper way to finish off the sheeting.

[xterarc]

Thanks a lot guys!!!
You won't believe it BMatthews (or most probably you will) but I just realised/find out what the proper way is after reading your post. IT DOES make sense now :D .
cheers