The term encompasses both epitrochoid and hypotrochoid.
2.
For a while, engineers were faced with what they called " chatter marks " and " devil's scratch " in the inner epitrochoid surface.
3.
In the parametric equations given above, the curve is an epitrochoid if \ omega _ 1 and \ omega _ 2 have the same sign, and a hypotrochoid if they have opposite signs.
4.
The four-stage cycle of : intake, compression, ignition and exhaust occurs in a moving combustion chamber between the inside of an oval-like epitrochoid-shaped housing, and a rotor that is similar in shape to a Reuleaux triangle with sides that are somewhat flatter.
5.
In each rotor of the Wankel engine, the oval-like epitrochoid-shaped housing surrounds a rotor which is triangular with bow-shaped flanks ( often confused with a Reuleaux triangle, a three-pointed curve of constant width, but with the bulge in the middle of each side a bit more flattened ).
6.
An "'epitrochoid "'( or ) is a roulette traced by a point attached to a circle of radius " r " rolling around the outside of a fixed circle of radius " R ", where the point is at a distance " d " from the center of the exterior circle.
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