Working on the RV14A fuselage. Page 29-06 calls for using a digital level to put a 10 DEG twist in the upper longeron.
Well, I don't have a digital level. So how do I measure this? Let's see, what do I have that will give me a measurement? I do have a bubble level. I also have a very old carpenter's protractor that works very well. I also just so happened to have a metal shelf just laying around that happens to be perfectly square. I have tables that are perfectly level. Putting all of those tools together and securing with some clamps I came up with a system that looks like this:
After building the small wooden blocks called out in the plans I got busy twisting the longerons. I made sure the side face of the longeron was plumb, the metal shelf was level, and my protractor was set for 10 DEG. Twist away! A few more twists! Ok, a few more twists! Finally, we get:
Digital Level? WE DON'T NEED NO STINKIN' Digital Level!