by supercruiser » Tue Feb 22, 2011 6:20 pm
The formers splitting is a common problem. Cliffm suggestion is a good one.
A couple of other things that might help. Gluing a piece of tissue over the balsa before you cut helps a little. The tissue gives it some resistance to splitting.
Also, for the stringer notches: I don't even cut them out anymore, I use a sanding notcher. It's really hard to explain but a simple tool that you can make easily. I can't post pictures so here goes the explanation:
You take a piece of your 1/16 square stringer material, cut it about 2 inches long.
glue the stringer to a piece of 220 grit sandpaper. I use CA glue.
Then you cut away the excess sandpaper from around the stringer.
On the side of the stringer opposite of the sandpaper side, glue a piece of balsa, 2 inches long and about 1/4 inch wide.
Now, all you do is rub the sandpaper side of the stringer back and forth where your notch is supposed to be in the former.
The sandpaper will "eat" away the balsa until it gets down to when your
1/4 wide top piece contacts the former.
Your notch is done.
Does that make sense?