Talk:Roots blower/Archives/2014
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Construction diagram
Can someone check this please. The description states that: "red curve is a hypocycloid and the blue curve is an epicycloid" with the red curve on the outside and the blue on the inside. However Epicycloid says: "an epicycloid ... around a fixed circle" and hypocycloid says: "a hypocycloid is .. generated by the trace of a fixed point on a small circle that rolls within a larger circle. It is comparable to the cycloid but instead of the circle rolling along a line, it rolls within a circle". This appears to be a direct contradiction! Martin of Sheffield (talk) 15:21, 28 October 2014 (UTC)
- You're right, the epicycloid would be on the outside. Andy Dingley (talk) 15:51, 28 October 2014 (UTC)