Some spinners treadle at a constant speed and vary their drafting or change the whorl size. They would just treadle a little faster or a little slower to make up for the change in ratio.
I would have them change ratios and go back to spinning and after awhile they would be back at roughly the same rpm. A good spinner might make 1000 rpm whereas a slow spinner about 500 rpm. I have used a digital tachometer on many wheels, tracking all sorts of people spinning, and with all kinds of ratios, and they would be turning the flyer or spindle approximately 750 rpm (revolutions per minute). So if you draft one inch of fiber with each turn of the wheel, you will have a yarn with 12 twists per inch. The ratio of a wheel, or how many times the spindle turns, with one revolution of the wheel such as 12 to 1, means every time the main wheel makes one complete revolution the spindle turns around 12 times. I'll explain all the spinning jargon a little later.
The double drive wheels that I make (Norwegian and Saxony) have a double drive unless the person wants Scotch tension.
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