Two heddles on a rigid-heddle loom are not the equivalent of two shafts on a 4-shaft loom. It takes one heddle on a rigid-heddle loom to produce plain weave; whereas it takes two shafts on a 4-shaft loom.
In this third part of Madelyn's description of the different types of doubleweave, she addresses stitched double cloth.
Is using fishing line the solution to better selvedges? Madelyn weighs in.
What's the best approach to weaving a coverlet when you have a narrow loom?
I recently saw some blankets for sale with a really broad version herringbone, a kind of magnified or giant herringbone with each stripe several threads thick. Could you please explain how (or if!) I might re-create this on a 16-shaft loom?
What are the advantages of an end-feed shuttle over a boat shuttle? Are they worth purchasing?
You can weave plain weave and twill on 6 shafts, by using 4 shafts for the twill and 2 for the plain weave.
There isn’t a specific tie-up and treadling order for doublewide weaving; it depends on your threading (the weave structure you are producing, and the way you choose to assign the shafts to the layers).