Alright looks like I need to give RCC a refresher course in geometry. More specifically in conic sections.
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Originally Posted by Mobius
If someone on this forum actually understands what vex is asking, I will give that person an e-cookie  Because all i got was: |
Eccentricity (e) is the term used to describe a conic section. For instance in the case of a circle e=0. Eccentricity in geometric and orbital understanding is unit-less, thereby the term an eccentricity of 15mm is outside my understanding of the term usage.
Furthermore e is the ratio between c and a, where a is the semi-major axis value or the distance between the center point and the longest edge, and c is a geometric constant which is resulted from the sqrt(a^2-b^2) where b is the semi-minor axis or the distance from the center to the shortest edge.
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Originally Posted by josh18_2k
just measure a rotor and figure it out?
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I would, but I don't have one readily available. When I had my engine apart I couldn't take the time to get all the dimensions I need so I am stuck doing things this way.
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im guessing 105mm is the arc radius of the face, and then the midpoint is offset 15mm (to the inside obviously) to clear the peanut shape. but i dunno, ive never even seen a rotor IRL lol
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That was my thought as well, but using those values produces a rather 'bloated' rotor from what I remember. As this is a link to where I'm pulling the values from:
Rotary History