Re: How much bend in lattice walls
I don't know the math equation.
Here is a carpenters empirical way to measure the lattice bend. You need to know the wall height of your yurt when erected, the diameter of the yurt, and the focal point length, which is 1/2 yurt diameter. You need a straight edge, and the extended blade on your tape measure will work.
Find a flat spot like a garage floor or basement floor that you can draw out an arc of the footprint of your yurt wall when erected. Even dirt around your house will work. A basketball court in a park. A slab somewhere. Anyplace you can draw an arc.
Example. If your yurt is 16' diameter, use 8' as the focal point. Draw an arc several feet long.That arc represents the yurt wall curve in the installed position.
Draw out enough arc so that you have a point to point distance on the wall curve that equals your wall height. Not your lattice length, you WALL height.
Say your wall is 7' tall. Make a mark on the curve. Extend the blade and lock it at 7'. Set the blade o your mark, and sweep it side to side until it hits the wall line, and leave it on the line. Leave the tape sitting on those two points.
The widest distance from the arc to your tape blade at mid point of 7', will be the amount of bend in the lattice. At 7' wall height that's 3.5'. If the wall is 5' tall, it will be at 2.5'. At 6', it will be 3', etc.
Now this assumes you are installing the lattice at a 45 degree angle to the ground, or in effect making square shaped lattice, not diamond shaped.
Add a couple inches to that number because those steam bent coppiced shoots will lose some bend once you pull them off the three formers. The tighter they are bent, the more they will spring back.
This is all real fancy. A guy that makes steam bent trad yurt wall lattice is just gonna bend them about a half foot and know that it's gonna work. Have fun building your yurt.
