Discussion
Which characteristic does a single Hooke joint exhibit at an angle?
Answer: D
The output speeds up and slows down twice per revolution when the joint operates at an angle, the variation growing rapidly with the angle. At thirty degrees the fluctuation is about fifteen per cent. Two joints in the correct phase relationship cancel the effect. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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