...there is another shape which has the same properties as a circle (the set of all points equidistant from a fixed point) that has been used in internal combustion engines.
I believe you're referring to a rotary engine. Mazda experimented with them a number of years ago, but I don't believe anyone is using them anymore. I don't recall the name of the actual shape though.
I believe you're referring to a rotary engine. Mazda experimented with them a number of years ago, but I don't believe anyone is using them anymore. I don't recall the name of the actual shape though.
Reuleaux triangle. *whew* I knew I would remember it some day. You are correct, though--I don't think anyone uses a Wankel engine at this time. Check the Curve of Constant Width page via Wolfram's MathWorld site.
The last thing we want to do is start talking about trigonometry here. Why? Well, 'cos that's a sine that we're going on a tangent. Let's keep this thread on topic.
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This is the most off-topic I have ever been.