Sprang: unexpected result

I setup my small sprang loom again, this time with hand spun pineapple fiber. I followed SolRhiza Arts’ video on how to do “interlaced horizonal ribs.” The technique alternates right and left hand twists on each row, which I hoped would solve the curl issue. The weave started out beautifully.

Photo description: hand spun pineapple fiber warped and partially woven with interlaced horizontal ribs
Photo description: sprang work in progress on the small loom

I finished with the chain method across the middle, which I still don’t like. When I removed the work from the loom I had a shock: it didn’t have the stretch effect I expect from sprang. It stretched, the horizontal ribs disappeared, and it didn’t return to the original shape.

Photo description: sprang sample off the loom showing the threads going diagonally (wonky middle makes me unhappy)

Upon closer inspection, I had done a twill (over two, under two) weave at a diagonal. I’m not sure if this is the intended result, or I somehow missed something in the instructions. It is an interesting effect, and one that might work for a different project. The fabric certainly doesn’t curl.

Photo description: close up picture of the interlaced horizonal rib sprang at a 45 degree angle from the warp angle.