I put some more time in on the plane today.
I finished the internal structure on the outer sections of the three piece wing. Here's what they look like now:
I finished the sparring throughout the wing, and put it all together to feel the strength. It was very strong, but still susceptible to twisting. As
Craftydan and
aiidanwings suggested, this will hopefully not be an issue when the upper surface is attached. However, even without me applying any force, I've noticed the wing has developed some twist when laying flat on the table such that opposite corners are off the surface. Hopefully there is away to flatten it out when I glue the wing shut.
I also started experimenting with how I will be gluing down the the upper surface. I'm trying to decide whether or not to remove the paper on the inside of the upper foam. Without the paper, the fold will be much easier and cleaner, but strength will be reduced. How much and if it will matter I do not know.
Here is a pic of folding a test strip with the paper removed over the formers.
So my two main questions are:
- Should I remove the paper from the inside of the upper surface?
- And also, how do I make sure that when I glue everything shut the wing is not already twisted?