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Ernest Christley wrote:
OK. You caught me.
I always thought there was some back and forth motion in that rotary rotation. But I've just spend the last few minutes staring at http://www.keveney.com/Wankel.html
There has to be some recipricating motion. If there wasn't, the apex seals would all trace a perfect circle. I should go to bed.
Not reciprocating. There is acceleration and deceleration; and the vectors are complex - the e-shaft makes a complete rotation every time a new face of the rotor is presented to the spark plugs. Think of it like being in slow-and-go traffic on the freeway - you keep going forward, but sometimes not by much. In fact, the path of the valve stem on your wheel as you roll down the freeway is a "classic" trochoid. Take a look at: http://mathworld.wolfram.com/Trochoid.html
Dale R.
COZY MkIV #0497
Ch. 13
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