I was going to be silly with the following in another topic :
And I started to be a wise guy and ask why the fellow shaped the leading edges, and then, I thought that mine was a very good question. We were talking about scratch-building and shaping square-stock leading edges.
So what if we do not shape that leading edge?
Consider the power we have in our engines/motors.
Consider the turbulation we would get from those wings when flying at a high angle-of-attack.
OK, I propose the following. Build a general sort of trainer and only shape one leading edge.
Fly said model. I venture that the square wing will lift first, will stall last, and appreciable yawl won't occur until well up in speed.
If the wing is a "D" section, the covering can be put on the wing to the trailing edge of the leading edge stock, leaving the leading edge bare wood.
After testing that way, then leave the tip third of the span square and slowly shape the leading edge as it approaches the root.
Fly again. The yawl will be a little less, the speed up a bunch, and the square wing will still stall last...and possibly at nearly the same angle.
By the way, leaving the square leading edge stock uncovered would be a good idea. It can be shaped later and covered. Even if both wings were to have square leading edges, I would not cover them with film. I think I would not even sand them but just brush some butyrate on them...and not sand after that either.
Or I could just be all wet about all this. But if you think I am, say why.
Ken