I finished spinning the second four ounce bump of the yak/merino blend over the Labor Day weekend. "New Moon" was spun semi-woolen (longdraw from the fold or the end) into approximately 230 yards of 2ply.
50/50 yak/merino blend, New Moon colorway from Abstract Fibers:
I was lazy and didn't pull the first bump's skeins to check what weight/diameter my singles should be. I just spun what I thought I remembered it should be. Not one of my most brilliant ideas. Second bump skein came in at a third less yardage (about 230 yds) than the first bump's skein (360 yds). Lesson learned: my memory sucks.
Another spinning project that changing parameters brought mixed results in is Rasputin. This was an eight ounce bump I divided into eight approximately one ounce braids. All were spun worsted from commercial top and chain/Navajo plied. Here I got variations in yardage by spinning singles on different spindles or switching between spindles and wheel. Weight varies between lace to heavy fingering weight. Total 3ply yardage is 921 yds (2,763 yds of Singles).
Wensleydale, 8 oz., Rasputin colorway from Crown Mountain Farms: