Erick: yep, I've seen the curved rod idea - it's quite clever. And yes, i do have a Dob in mind - ;-).
Janoskiss: I can understand why the two examples on the linked page wouldn't work, but can you explain specifically why this one wouldn't?
This idea doesn't seem to suffer either of the stated problems of the two types listed on the linked page. It seems to me that the end of each arm would be driven at a constant rate relative to its tangent (ie. perpendicularly). So, why doesn't that give a constant rate of angular change?
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